Replace the pg_listener-based LISTEN/NOTIFY mechanism with an in-memory queue.
In addition, add support for a "payload" string to be passed along with each notify event. This implementation should be significantly more efficient than the old one, and is also more compatible with Hot Standby usage. There is not yet any facility for HS slaves to receive notifications generated on the master, although such a thing is possible in future. Joachim Wieland, reviewed by Jeff Davis; also hacked on by me.
This commit is contained in:
Tom Lane
parent
fc5173ad51
commit
d1e027221d
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@ -1,4 +1,4 @@
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<!-- $PostgreSQL: pgsql/doc/src/sgml/catalogs.sgml,v 2.221 2010/02/07 20:48:09 tgl Exp $ -->
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<!-- $PostgreSQL: pgsql/doc/src/sgml/catalogs.sgml,v 2.222 2010/02/16 22:34:41 tgl Exp $ -->
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<!--
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Documentation of the system catalogs, directed toward PostgreSQL developers
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-->
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@ -168,11 +168,6 @@
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<entry>metadata for large objects</entry>
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</row>
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<row>
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<entry><link linkend="catalog-pg-listener"><structname>pg_listener</structname></link></entry>
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<entry>asynchronous notification support</entry>
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</row>
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<row>
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<entry><link linkend="catalog-pg-namespace"><structname>pg_namespace</structname></link></entry>
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<entry>schemas</entry>
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@ -3253,68 +3248,6 @@
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</table>
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</sect1>
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<sect1 id="catalog-pg-listener">
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<title><structname>pg_listener</structname></title>
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<indexterm zone="catalog-pg-listener">
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<primary>pg_listener</primary>
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</indexterm>
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<para>
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The catalog <structname>pg_listener</structname> supports the
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<xref linkend="sql-listen" endterm="sql-listen-title"> and
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<xref linkend="sql-notify" endterm="sql-notify-title">
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commands. A listener creates an entry in
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<structname>pg_listener</structname> for each notification name
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it is listening for. A notifier scans <structname>pg_listener</structname>
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and updates each matching entry to show that a notification has occurred.
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The notifier also sends a signal (using the PID recorded in the table)
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to awaken the listener from sleep.
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</para>
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<table>
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<title><structname>pg_listener</> Columns</title>
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<tgroup cols="3">
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<thead>
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<row>
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<entry>Name</entry>
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<entry>Type</entry>
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<entry>Description</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry><structfield>relname</structfield></entry>
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<entry><type>name</type></entry>
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<entry>
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Notify condition name. (The name need not match any actual
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relation in the database; the name <structfield>relname</> is historical.)
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</entry>
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</row>
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<row>
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<entry><structfield>listenerpid</structfield></entry>
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<entry><type>int4</type></entry>
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<entry>PID of the server process that created this entry</entry>
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</row>
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<row>
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<entry><structfield>notification</structfield></entry>
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<entry><type>int4</type></entry>
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<entry>
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Zero if no event is pending for this listener. If an event is
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pending, the PID of the server process that sent the notification
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</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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</sect1>
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<sect1 id="catalog-pg-namespace">
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<title><structname>pg_namespace</structname></title>
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@ -1,4 +1,4 @@
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<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.503 2010/02/16 21:18:01 momjian Exp $ -->
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<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.504 2010/02/16 22:34:42 tgl Exp $ -->
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<chapter id="functions">
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<title>Functions and Operators</title>
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@ -11529,6 +11529,12 @@ postgres=# select * from unnest2(array[[1,2],[3,4]]);
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</entry>
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</row>
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<row>
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<entry><literal><function>pg_listening_channels</function>()</literal></entry>
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<entry><type>setof text</type></entry>
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<entry>channel names that the session is currently listening on</entry>
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</row>
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<row>
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<entry><literal><function>inet_client_addr</function>()</literal></entry>
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<entry><type>inet</type></entry>
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@ -11674,6 +11680,16 @@ SET search_path TO <replaceable>schema</> <optional>, <replaceable>schema</>, ..
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</para>
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</note>
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<indexterm>
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<primary>pg_listening_channels</primary>
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</indexterm>
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<para>
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<function>pg_listening_channels</function> returns a set of names of
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channels that the current session is listening to. See <xref
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linkend="sql-listen" endterm="sql-listen-title"> for more information.
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</para>
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<indexterm>
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<primary>inet_client_addr</primary>
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</indexterm>
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|
|
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@ -1,4 +1,4 @@
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<!-- $PostgreSQL: pgsql/doc/src/sgml/libpq.sgml,v 1.298 2010/02/16 20:58:13 momjian Exp $ -->
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<!-- $PostgreSQL: pgsql/doc/src/sgml/libpq.sgml,v 1.299 2010/02/16 22:34:42 tgl Exp $ -->
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<chapter id="libpq">
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<title><application>libpq</application> - C Library</title>
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@ -307,28 +307,28 @@
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<entry>Description</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry><literal>disable</></entry>
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<entry>only try a non-<acronym>SSL</> connection</entry>
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</row>
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<row>
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<entry><literal>allow</></entry>
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<entry>first try a non-<acronym>SSL</>
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connection; if that fails, try an <acronym>SSL</>
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connection</entry>
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</row>
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<row>
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<entry><literal>prefer</> (default)</entry>
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<entry>first try an <acronym>SSL</> connection; if
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that fails, try a non-<acronym>SSL</>
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connection</entry>
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</row>
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<row>
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<entry><literal>require</></entry>
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<entry>only try an <acronym>SSL</> connection</entry>
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@ -481,7 +481,7 @@
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</para>
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<para>
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If <literal>expand_dbname</literal> is non-zero and
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If <literal>expand_dbname</literal> is non-zero and
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<parameter>dbname</parameter> contains an <symbol>=</symbol> sign, it
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is taken as a <parameter>conninfo</parameter> string in exactly the same way as
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if it had been passed to <function>PQconnectdb</function>(see below). Previously
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@ -4111,50 +4111,48 @@ typedef struct {
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<productname>PostgreSQL</productname> offers asynchronous notification
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via the <command>LISTEN</command> and <command>NOTIFY</command>
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commands. A client session registers its interest in a particular
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notification condition with the <command>LISTEN</command> command (and
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notification channel with the <command>LISTEN</command> command (and
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can stop listening with the <command>UNLISTEN</command> command). All
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sessions listening on a particular condition will be notified
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sessions listening on a particular channel will be notified
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asynchronously when a <command>NOTIFY</command> command with that
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condition name is executed by any session. No additional information
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is passed from the notifier to the listener. Thus, typically, any
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actual data that needs to be communicated is transferred through a
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database table. Commonly, the condition name is the same as the
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associated table, but it is not necessary for there to be any associated
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table.
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channel name is executed by any session. A <quote>payload</> string can
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be passed to communicate additional data to the listeners.
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</para>
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<para>
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<application>libpq</application> applications submit
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<command>LISTEN</command> and <command>UNLISTEN</command> commands as
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<command>LISTEN</command>, <command>UNLISTEN</command>,
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and <command>NOTIFY</command> commands as
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ordinary SQL commands. The arrival of <command>NOTIFY</command>
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messages can subsequently be detected by calling
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<function>PQnotifies</function>.<indexterm><primary>PQnotifies</></>
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</para>
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<para>
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The function <function>PQnotifies</function>
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returns the next notification from a list of unhandled
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notification messages received from the server. It returns a null pointer if
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there are no pending notifications. Once a notification is
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returned from <function>PQnotifies</>, it is considered handled and will be
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removed from the list of notifications.
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The function <function>PQnotifies</function> returns the next notification
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from a list of unhandled notification messages received from the server.
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It returns a null pointer if there are no pending notifications. Once a
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notification is returned from <function>PQnotifies</>, it is considered
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handled and will be removed from the list of notifications.
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<synopsis>
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PGnotify *PQnotifies(PGconn *conn);
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typedef struct pgNotify {
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char *relname; /* notification condition name */
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char *relname; /* notification channel name */
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int be_pid; /* process ID of notifying server process */
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char *extra; /* notification parameter */
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char *extra; /* notification payload string */
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} PGnotify;
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</synopsis>
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After processing a <structname>PGnotify</structname> object returned
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by <function>PQnotifies</function>, be sure to free it with
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<function>PQfreemem</function>. It is sufficient to free the
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<structname>PGnotify</structname> pointer; the
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<structfield>relname</structfield> and <structfield>extra</structfield>
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fields do not represent separate allocations. (At present, the
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<structfield>extra</structfield> field is unused and will always point
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to an empty string.)
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fields do not represent separate allocations. (The names of these fields
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are historical; in particular, channel names need not have anything to
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do with relation names.)
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</para>
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<para>
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|
|
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@ -1,4 +1,4 @@
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|||
<!-- $PostgreSQL: pgsql/doc/src/sgml/protocol.sgml,v 1.80 2010/02/16 20:58:14 momjian Exp $ -->
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<!-- $PostgreSQL: pgsql/doc/src/sgml/protocol.sgml,v 1.81 2010/02/16 22:34:43 tgl Exp $ -->
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<chapter id="protocol">
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<title>Frontend/Backend Protocol</title>
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@ -354,7 +354,7 @@
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<para>
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This message contains the response data from the previous step
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of GSSAPI or SSPI negotiation (AuthenticationGSS, AuthenticationSSPI
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or a previous AuthenticationGSSContinue). If the GSSAPI
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or a previous AuthenticationGSSContinue). If the GSSAPI
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or SSPI data in this message
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indicates more data is needed to complete the authentication,
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the frontend must send that data as another PasswordMessage. If
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|
|
@ -992,7 +992,7 @@
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<para>
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In the event of a backend-detected error during copy-in mode (including
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receipt of a CopyFail message), the backend will issue an ErrorResponse
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receipt of a CopyFail message), the backend will issue an ErrorResponse
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message. If the <command>COPY</> command was issued via an extended-query
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message, the backend will now discard frontend messages until a Sync
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message is received, then it will issue ReadyForQuery and return to normal
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|
|
@ -1117,7 +1117,7 @@
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|||
backend will send a NotificationResponse message (not to be
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confused with NoticeResponse!) whenever a
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<command>NOTIFY</command> command is executed for the same
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notification name.
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channel name.
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||||
</para>
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||||
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<note>
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|
|
@ -1340,7 +1340,7 @@ This section describes the base data types used in messages.
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|||
value that will appear, otherwise the value is variable.
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||||
Eg. String, String("user").
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||||
</para>
|
||||
|
||||
|
||||
<note>
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||||
<para>
|
||||
<emphasis>There is no predefined limit</emphasis> on the length of a string
|
||||
|
|
@ -1951,7 +1951,7 @@ Bind (F)
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|||
(denoted <replaceable>R</> below).
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||||
This can be zero to indicate that there are no result columns
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||||
or that the result columns should all use the default format
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||||
(text);
|
||||
(text);
|
||||
or one, in which case the specified format code is applied
|
||||
to all result columns (if any); or it can equal the actual
|
||||
number of result columns of the query.
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||||
|
|
@ -2500,7 +2500,7 @@ CopyOutResponse (B)
|
|||
separated by separator characters, etc). 1 indicates
|
||||
the overall copy format is binary (similar to DataRow
|
||||
format). See <xref linkend="sql-copy"
|
||||
endterm="sql-copy-title"> for more information.
|
||||
endterm="sql-copy-title"> for more information.
|
||||
</para>
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
|
|
@ -3187,7 +3187,7 @@ NotificationResponse (B)
|
|||
</term>
|
||||
<listitem>
|
||||
<para>
|
||||
The name of the condition that the notify has been raised on.
|
||||
The name of the channel that the notify has been raised on.
|
||||
</para>
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
|
|
@ -3197,9 +3197,7 @@ NotificationResponse (B)
|
|||
</term>
|
||||
<listitem>
|
||||
<para>
|
||||
Additional information passed from the notifying process.
|
||||
(Currently, this feature is unimplemented so the field
|
||||
is always an empty string.)
|
||||
The <quote>payload</> string passed from the notifying process.
|
||||
</para>
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
|
|
@ -4353,7 +4351,7 @@ the backend.
|
|||
|
||||
<para>
|
||||
The NotificationResponse ('<literal>A</>') message has an additional string
|
||||
field, which is presently empty but might someday carry additional data passed
|
||||
field, which can carry a <quote>payload</> string passed
|
||||
from the <command>NOTIFY</command> event sender.
|
||||
</para>
|
||||
|
||||
|
|
@ -4364,5 +4362,4 @@ string parameter; this has been removed.
|
|||
|
||||
</sect1>
|
||||
|
||||
|
||||
</chapter>
|
||||
|
|
|
|||
|
|
@ -1,5 +1,5 @@
|
|||
<!--
|
||||
$PostgreSQL: pgsql/doc/src/sgml/ref/listen.sgml,v 1.23 2008/11/14 10:22:47 petere Exp $
|
||||
$PostgreSQL: pgsql/doc/src/sgml/ref/listen.sgml,v 1.24 2010/02/16 22:34:43 tgl Exp $
|
||||
PostgreSQL documentation
|
||||
-->
|
||||
|
||||
|
|
@ -21,7 +21,7 @@ PostgreSQL documentation
|
|||
|
||||
<refsynopsisdiv>
|
||||
<synopsis>
|
||||
LISTEN <replaceable class="PARAMETER">name</replaceable>
|
||||
LISTEN <replaceable class="PARAMETER">channel</replaceable>
|
||||
</synopsis>
|
||||
</refsynopsisdiv>
|
||||
|
||||
|
|
@ -30,24 +30,23 @@ LISTEN <replaceable class="PARAMETER">name</replaceable>
|
|||
|
||||
<para>
|
||||
<command>LISTEN</command> registers the current session as a
|
||||
listener on the notification condition <replaceable
|
||||
class="PARAMETER">name</replaceable>.
|
||||
listener on the notification channel named <replaceable
|
||||
class="PARAMETER">channel</replaceable>.
|
||||
If the current session is already registered as a listener for
|
||||
this notification condition, nothing is done.
|
||||
this notification channel, nothing is done.
|
||||
</para>
|
||||
|
||||
<para>
|
||||
Whenever the command <command>NOTIFY <replaceable
|
||||
class="PARAMETER">name</replaceable></command> is invoked, either
|
||||
class="PARAMETER">channel</replaceable></command> is invoked, either
|
||||
by this session or another one connected to the same database, all
|
||||
the sessions currently listening on that notification condition are
|
||||
the sessions currently listening on that notification channel are
|
||||
notified, and each will in turn notify its connected client
|
||||
application. See the discussion of <command>NOTIFY</command> for
|
||||
more information.
|
||||
application.
|
||||
</para>
|
||||
|
||||
<para>
|
||||
A session can be unregistered for a given notify condition with the
|
||||
A session can be unregistered for a given notification channel with the
|
||||
<command>UNLISTEN</command> command. A session's listen
|
||||
registrations are automatically cleared when the session ends.
|
||||
</para>
|
||||
|
|
@ -78,16 +77,31 @@ LISTEN <replaceable class="PARAMETER">name</replaceable>
|
|||
|
||||
<variablelist>
|
||||
<varlistentry>
|
||||
<term><replaceable class="PARAMETER">name</replaceable></term>
|
||||
<term><replaceable class="PARAMETER">channel</replaceable></term>
|
||||
<listitem>
|
||||
<para>
|
||||
Name of a notify condition (any identifier).
|
||||
Name of a notification channel (any identifier).
|
||||
</para>
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
</variablelist>
|
||||
</refsect1>
|
||||
|
||||
<refsect1>
|
||||
<title>Notes</title>
|
||||
|
||||
<para>
|
||||
<command>LISTEN</command> takes effect at transaction commit.
|
||||
If <command>LISTEN</command> or <command>UNLISTEN</command> is executed
|
||||
within a transaction that later rolls back, the set of notification
|
||||
channels being listened to is unchanged.
|
||||
</para>
|
||||
<para>
|
||||
A transaction that has executed <command>LISTEN</command> cannot be
|
||||
prepared for two-phase commit.
|
||||
</para>
|
||||
</refsect1>
|
||||
|
||||
<refsect1>
|
||||
<title>Examples</title>
|
||||
|
||||
|
|
|
|||
|
|
@ -1,5 +1,5 @@
|
|||
<!--
|
||||
$PostgreSQL: pgsql/doc/src/sgml/ref/notify.sgml,v 1.31 2008/11/14 10:22:47 petere Exp $
|
||||
$PostgreSQL: pgsql/doc/src/sgml/ref/notify.sgml,v 1.32 2010/02/16 22:34:43 tgl Exp $
|
||||
PostgreSQL documentation
|
||||
-->
|
||||
|
||||
|
|
@ -21,7 +21,7 @@ PostgreSQL documentation
|
|||
|
||||
<refsynopsisdiv>
|
||||
<synopsis>
|
||||
NOTIFY <replaceable class="PARAMETER">name</replaceable>
|
||||
NOTIFY <replaceable class="PARAMETER">channel</replaceable> [ , <replaceable class="PARAMETER">payload</replaceable> ]
|
||||
</synopsis>
|
||||
</refsynopsisdiv>
|
||||
|
||||
|
|
@ -29,35 +29,39 @@ NOTIFY <replaceable class="PARAMETER">name</replaceable>
|
|||
<title>Description</title>
|
||||
|
||||
<para>
|
||||
The <command>NOTIFY</command> command sends a notification event to each
|
||||
client application that has previously executed
|
||||
<command>LISTEN <replaceable class="parameter">name</replaceable></command>
|
||||
for the specified notification name in the current database.
|
||||
The <command>NOTIFY</command> command sends a notification event together
|
||||
with an optional <quote>payload</> string to each client application that
|
||||
has previously executed
|
||||
<command>LISTEN <replaceable class="parameter">channel</></command>
|
||||
for the specified channel name in the current database.
|
||||
</para>
|
||||
|
||||
<para>
|
||||
<command>NOTIFY</command> provides a simple form of signal or
|
||||
<command>NOTIFY</command> provides a simple
|
||||
interprocess communication mechanism for a collection of processes
|
||||
accessing the same <productname>PostgreSQL</productname> database.
|
||||
Higher-level mechanisms can be built by using tables in the database to
|
||||
pass additional data (beyond a mere notification name) from notifier to
|
||||
listener(s).
|
||||
A payload string can be sent along with the notification, and
|
||||
higher-level mechanisms for passing structured data can be built by using
|
||||
tables in the database to pass additional data from notifier to listener(s).
|
||||
</para>
|
||||
|
||||
<para>
|
||||
The information passed to the client for a notification event includes the notification
|
||||
name and the notifying session's server process <acronym>PID</>. It is up to the
|
||||
database designer to define the notification names that will be used in a given
|
||||
database and what each one means.
|
||||
The information passed to the client for a notification event includes the
|
||||
notification channel
|
||||
name, the notifying session's server process <acronym>PID</>, and the
|
||||
payload string, which is an empty string if it has not been specified.
|
||||
</para>
|
||||
|
||||
<para>
|
||||
Commonly, the notification name is the same as the name of some table in
|
||||
It is up to the database designer to define the channel names that will
|
||||
be used in a given database and what each one means.
|
||||
Commonly, the channel name is the same as the name of some table in
|
||||
the database, and the notify event essentially means, <quote>I changed this table,
|
||||
take a look at it to see what's new</quote>. But no such association is enforced by
|
||||
the <command>NOTIFY</command> and <command>LISTEN</command> commands. For
|
||||
example, a database designer could use several different notification names
|
||||
to signal different sorts of changes to a single table.
|
||||
example, a database designer could use several different channel names
|
||||
to signal different sorts of changes to a single table. Alternatively,
|
||||
the payload string could be used to differentiate various cases.
|
||||
</para>
|
||||
|
||||
<para>
|
||||
|
|
@ -89,19 +93,22 @@ NOTIFY <replaceable class="PARAMETER">name</replaceable>
|
|||
</para>
|
||||
|
||||
<para>
|
||||
<command>NOTIFY</command> behaves like Unix signals in one important
|
||||
respect: if the same notification name is signaled multiple times in quick
|
||||
succession, recipients might get only one notification event for several executions
|
||||
of <command>NOTIFY</command>. So it is a bad idea to depend on the number
|
||||
of notifications received. Instead, use <command>NOTIFY</command> to wake up
|
||||
applications that need to pay attention to something, and use a database
|
||||
object (such as a sequence) to keep track of what happened or how many times
|
||||
it happened.
|
||||
If the same channel name is signaled multiple times from the same
|
||||
transaction with identical payload strings, the
|
||||
database server can decide to deliver a single notification only.
|
||||
On the other hand, notifications with distinct payload strings will
|
||||
always be delivered as distinct notifications. Similarly, notifications from
|
||||
different transactions will never get folded into one notification.
|
||||
Except for dropping later instances of duplicate notifications,
|
||||
<command>NOTIFY</command> guarantees that notifications from the same
|
||||
transaction get delivered in the order they were sent. It is also
|
||||
guaranteed that messages from different transactions are delivered in
|
||||
the order in which the transactions committed.
|
||||
</para>
|
||||
|
||||
<para>
|
||||
It is common for a client that executes <command>NOTIFY</command>
|
||||
to be listening on the same notification name itself. In that case
|
||||
to be listening on the same notification channel itself. In that case
|
||||
it will get back a notification event, just like all the other
|
||||
listening sessions. Depending on the application logic, this could
|
||||
result in useless work, for example, reading a database table to
|
||||
|
|
@ -111,12 +118,7 @@ NOTIFY <replaceable class="PARAMETER">name</replaceable>
|
|||
notification event message) is the same as one's own session's
|
||||
<acronym>PID</> (available from <application>libpq</>). When they
|
||||
are the same, the notification event is one's own work bouncing
|
||||
back, and can be ignored. (Despite what was said in the preceding
|
||||
paragraph, this is a safe technique.
|
||||
<productname>PostgreSQL</productname> keeps self-notifications
|
||||
separate from notifications arriving from other sessions, so you
|
||||
cannot miss an outside notification by ignoring your own
|
||||
notifications.)
|
||||
back, and can be ignored.
|
||||
</para>
|
||||
</refsect1>
|
||||
|
||||
|
|
@ -125,16 +127,61 @@ NOTIFY <replaceable class="PARAMETER">name</replaceable>
|
|||
|
||||
<variablelist>
|
||||
<varlistentry>
|
||||
<term><replaceable class="PARAMETER">name</replaceable></term>
|
||||
<term><replaceable class="PARAMETER">channel</replaceable></term>
|
||||
<listitem>
|
||||
<para>
|
||||
Name of the notification to be signaled (any identifier).
|
||||
Name of the notification channel to be signaled (any identifier).
|
||||
</para>
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
<varlistentry>
|
||||
<term><replaceable class="PARAMETER">payload</replaceable></term>
|
||||
<listitem>
|
||||
<para>
|
||||
The <quote>payload</> string to be communicated along with the
|
||||
notification. This string must be shorter than 8000 bytes, and
|
||||
is treated as text.
|
||||
(If binary data or large amounts of information need to be communicated,
|
||||
it's best to put it in a database table and send the key of the record.)
|
||||
</para>
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
</variablelist>
|
||||
</refsect1>
|
||||
|
||||
<refsect1>
|
||||
<title>Notes</title>
|
||||
|
||||
<indexterm>
|
||||
<primary>pg_notify</primary>
|
||||
</indexterm>
|
||||
|
||||
<para>
|
||||
To send a notification you can also use the function
|
||||
<literal><function>pg_notify</function>(<type>text</type>,
|
||||
<type>text</type>)</literal>. The function takes the channel name as the
|
||||
first argument and the payload as the second. The function is much easier
|
||||
to use than the <command>NOTIFY</command> command if you need to work with
|
||||
non-constant channel names and payloads.
|
||||
</para>
|
||||
<para>
|
||||
There is a queue that holds notifications that have been sent but not
|
||||
yet processed by all listening sessions. If this queue becomes full,
|
||||
transactions calling <command>NOTIFY</command> will fail at commit.
|
||||
The queue is quite large (8GB in a standard installation) and should be
|
||||
sufficiently sized for almost every use case. However, no cleanup can take
|
||||
place if a session executes <command>LISTEN</command> and then enters a
|
||||
transaction for a very long time. Once the queue is half full you will see
|
||||
warnings in the log file pointing you to the session that is preventing
|
||||
cleanup. In this case you should make sure that this session ends its
|
||||
current transaction so that cleanup can proceed.
|
||||
</para>
|
||||
<para>
|
||||
A transaction that has executed <command>NOTIFY</command> cannot be
|
||||
prepared for two-phase commit.
|
||||
</para>
|
||||
</refsect1>
|
||||
|
||||
<refsect1>
|
||||
<title>Examples</title>
|
||||
|
||||
|
|
@ -146,6 +193,12 @@ NOTIFY <replaceable class="PARAMETER">name</replaceable>
|
|||
LISTEN virtual;
|
||||
NOTIFY virtual;
|
||||
Asynchronous notification "virtual" received from server process with PID 8448.
|
||||
NOTIFY virtual, 'This is the payload';
|
||||
Asynchronous notification "virtual" with payload "This is the payload" received from server process with PID 8448.
|
||||
|
||||
LISTEN foo;
|
||||
SELECT pg_notify('fo' || 'o', 'pay' || 'load');
|
||||
Asynchronous notification "foo" with payload "payload" received from server process with PID 14728.
|
||||
</programlisting>
|
||||
</para>
|
||||
</refsect1>
|
||||
|
|
|
|||
|
|
@ -1,5 +1,5 @@
|
|||
<!--
|
||||
$PostgreSQL: pgsql/doc/src/sgml/ref/unlisten.sgml,v 1.30 2008/11/14 10:22:47 petere Exp $
|
||||
$PostgreSQL: pgsql/doc/src/sgml/ref/unlisten.sgml,v 1.31 2010/02/16 22:34:43 tgl Exp $
|
||||
PostgreSQL documentation
|
||||
-->
|
||||
|
||||
|
|
@ -21,7 +21,7 @@ PostgreSQL documentation
|
|||
|
||||
<refsynopsisdiv>
|
||||
<synopsis>
|
||||
UNLISTEN { <replaceable class="PARAMETER">name</replaceable> | * }
|
||||
UNLISTEN { <replaceable class="PARAMETER">channel</replaceable> | * }
|
||||
</synopsis>
|
||||
</refsynopsisdiv>
|
||||
|
||||
|
|
@ -33,8 +33,8 @@ UNLISTEN { <replaceable class="PARAMETER">name</replaceable> | * }
|
|||
registration for <command>NOTIFY</command> events.
|
||||
<command>UNLISTEN</command> cancels any existing registration of
|
||||
the current <productname>PostgreSQL</productname> session as a
|
||||
listener on the notification <replaceable
|
||||
class="PARAMETER">name</replaceable>. The special wildcard
|
||||
listener on the notification channel named <replaceable
|
||||
class="PARAMETER">channel</replaceable>. The special wildcard
|
||||
<literal>*</literal> cancels all listener registrations for the
|
||||
current session.
|
||||
</para>
|
||||
|
|
@ -52,10 +52,10 @@ UNLISTEN { <replaceable class="PARAMETER">name</replaceable> | * }
|
|||
|
||||
<variablelist>
|
||||
<varlistentry>
|
||||
<term><replaceable class="PARAMETER">name</replaceable></term>
|
||||
<term><replaceable class="PARAMETER">channel</replaceable></term>
|
||||
<listitem>
|
||||
<para>
|
||||
Name of a notification (any identifier).
|
||||
Name of a notification channel (any identifier).
|
||||
</para>
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
|
|
@ -83,6 +83,11 @@ UNLISTEN { <replaceable class="PARAMETER">name</replaceable> | * }
|
|||
At the end of each session, <command>UNLISTEN *</command> is
|
||||
automatically executed.
|
||||
</para>
|
||||
|
||||
<para>
|
||||
A transaction that has executed <command>UNLISTEN</command> cannot be
|
||||
prepared for two-phase commit.
|
||||
</para>
|
||||
</refsect1>
|
||||
|
||||
<refsect1>
|
||||
|
|
@ -100,7 +105,7 @@ Asynchronous notification "virtual" received from server process with PID 8448.
|
|||
|
||||
<para>
|
||||
Once <command>UNLISTEN</> has been executed, further <command>NOTIFY</>
|
||||
commands will be ignored:
|
||||
messages will be ignored:
|
||||
|
||||
<programlisting>
|
||||
UNLISTEN virtual;
|
||||
|
|
|
|||
|
|
@ -1,4 +1,4 @@
|
|||
<!-- $PostgreSQL: pgsql/doc/src/sgml/storage.sgml,v 1.31 2010/02/07 20:48:09 tgl Exp $ -->
|
||||
<!-- $PostgreSQL: pgsql/doc/src/sgml/storage.sgml,v 1.32 2010/02/16 22:34:43 tgl Exp $ -->
|
||||
|
||||
<chapter id="storage">
|
||||
|
||||
|
|
@ -77,6 +77,11 @@ Item
|
|||
(used for shared row locks)</entry>
|
||||
</row>
|
||||
|
||||
<row>
|
||||
<entry><filename>pg_notify</></entry>
|
||||
<entry>Subdirectory containing LISTEN/NOTIFY status data</entry>
|
||||
</row>
|
||||
|
||||
<row>
|
||||
<entry><filename>pg_stat_tmp</></entry>
|
||||
<entry>Subdirectory containing temporary files for the statistics
|
||||
|
|
|
|||
|
|
@ -41,7 +41,7 @@
|
|||
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $PostgreSQL: pgsql/src/backend/access/transam/slru.c,v 1.48 2010/01/02 16:57:35 momjian Exp $
|
||||
* $PostgreSQL: pgsql/src/backend/access/transam/slru.c,v 1.49 2010/02/16 22:34:43 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
|
|
@ -59,25 +59,6 @@
|
|||
#include "miscadmin.h"
|
||||
|
||||
|
||||
/*
|
||||
* Define segment size. A page is the same BLCKSZ as is used everywhere
|
||||
* else in Postgres. The segment size can be chosen somewhat arbitrarily;
|
||||
* we make it 32 pages by default, or 256Kb, i.e. 1M transactions for CLOG
|
||||
* or 64K transactions for SUBTRANS.
|
||||
*
|
||||
* Note: because TransactionIds are 32 bits and wrap around at 0xFFFFFFFF,
|
||||
* page numbering also wraps around at 0xFFFFFFFF/xxxx_XACTS_PER_PAGE (where
|
||||
* xxxx is CLOG or SUBTRANS, respectively), and segment numbering at
|
||||
* 0xFFFFFFFF/xxxx_XACTS_PER_PAGE/SLRU_PAGES_PER_SEGMENT. We need
|
||||
* take no explicit notice of that fact in this module, except when comparing
|
||||
* segment and page numbers in SimpleLruTruncate (see PagePrecedes()).
|
||||
*
|
||||
* Note: this file currently assumes that segment file names will be four
|
||||
* hex digits. This sets a lower bound on the segment size (64K transactions
|
||||
* for 32-bit TransactionIds).
|
||||
*/
|
||||
#define SLRU_PAGES_PER_SEGMENT 32
|
||||
|
||||
#define SlruFileName(ctl, path, seg) \
|
||||
snprintf(path, MAXPGPATH, "%s/%04X", (ctl)->Dir, seg)
|
||||
|
||||
|
|
@ -183,6 +164,8 @@ SimpleLruInit(SlruCtl ctl, const char *name, int nslots, int nlsns,
|
|||
shared = (SlruShared) ShmemInitStruct(name,
|
||||
SimpleLruShmemSize(nslots, nlsns),
|
||||
&found);
|
||||
if (!shared)
|
||||
elog(ERROR, "out of shared memory");
|
||||
|
||||
if (!IsUnderPostmaster)
|
||||
{
|
||||
|
|
|
|||
|
|
@ -8,7 +8,7 @@
|
|||
*
|
||||
*
|
||||
* IDENTIFICATION
|
||||
* $PostgreSQL: pgsql/src/backend/access/transam/twophase_rmgr.c,v 1.12 2010/01/02 16:57:35 momjian Exp $
|
||||
* $PostgreSQL: pgsql/src/backend/access/transam/twophase_rmgr.c,v 1.13 2010/02/16 22:34:43 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
|
|
@ -16,7 +16,6 @@
|
|||
|
||||
#include "access/multixact.h"
|
||||
#include "access/twophase_rmgr.h"
|
||||
#include "commands/async.h"
|
||||
#include "pgstat.h"
|
||||
#include "storage/lock.h"
|
||||
|
||||
|
|
@ -25,7 +24,6 @@ const TwoPhaseCallback twophase_recover_callbacks[TWOPHASE_RM_MAX_ID + 1] =
|
|||
{
|
||||
NULL, /* END ID */
|
||||
lock_twophase_recover, /* Lock */
|
||||
NULL, /* notify/listen */
|
||||
NULL, /* pgstat */
|
||||
multixact_twophase_recover /* MultiXact */
|
||||
};
|
||||
|
|
@ -34,7 +32,6 @@ const TwoPhaseCallback twophase_postcommit_callbacks[TWOPHASE_RM_MAX_ID + 1] =
|
|||
{
|
||||
NULL, /* END ID */
|
||||
lock_twophase_postcommit, /* Lock */
|
||||
notify_twophase_postcommit, /* notify/listen */
|
||||
pgstat_twophase_postcommit, /* pgstat */
|
||||
multixact_twophase_postcommit /* MultiXact */
|
||||
};
|
||||
|
|
@ -43,7 +40,6 @@ const TwoPhaseCallback twophase_postabort_callbacks[TWOPHASE_RM_MAX_ID + 1] =
|
|||
{
|
||||
NULL, /* END ID */
|
||||
lock_twophase_postabort, /* Lock */
|
||||
NULL, /* notify/listen */
|
||||
pgstat_twophase_postabort, /* pgstat */
|
||||
multixact_twophase_postabort /* MultiXact */
|
||||
};
|
||||
|
|
@ -52,7 +48,6 @@ const TwoPhaseCallback twophase_standby_recover_callbacks[TWOPHASE_RM_MAX_ID + 1
|
|||
{
|
||||
NULL, /* END ID */
|
||||
lock_twophase_standby_recover, /* Lock */
|
||||
NULL, /* notify/listen */
|
||||
NULL, /* pgstat */
|
||||
NULL /* MultiXact */
|
||||
};
|
||||
|
|
|
|||
|
|
@ -10,7 +10,7 @@
|
|||
*
|
||||
*
|
||||
* IDENTIFICATION
|
||||
* $PostgreSQL: pgsql/src/backend/access/transam/xact.c,v 1.285 2010/02/13 16:15:46 sriggs Exp $
|
||||
* $PostgreSQL: pgsql/src/backend/access/transam/xact.c,v 1.286 2010/02/16 22:34:43 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
|
|
@ -1736,8 +1736,12 @@ CommitTransaction(void)
|
|||
/* close large objects before lower-level cleanup */
|
||||
AtEOXact_LargeObject(true);
|
||||
|
||||
/* NOTIFY commit must come before lower-level cleanup */
|
||||
AtCommit_Notify();
|
||||
/*
|
||||
* Insert notifications sent by NOTIFY commands into the queue. This
|
||||
* should be late in the pre-commit sequence to minimize time spent
|
||||
* holding the notify-insertion lock.
|
||||
*/
|
||||
PreCommit_Notify();
|
||||
|
||||
/* Prevent cancel/die interrupt while cleaning up */
|
||||
HOLD_INTERRUPTS();
|
||||
|
|
@ -1825,6 +1829,7 @@ CommitTransaction(void)
|
|||
/* Check we've released all catcache entries */
|
||||
AtEOXact_CatCache(true);
|
||||
|
||||
AtCommit_Notify();
|
||||
AtEOXact_GUC(true, 1);
|
||||
AtEOXact_SPI(true);
|
||||
AtEOXact_on_commit_actions(true);
|
||||
|
|
|
|||
|
|
@ -2,7 +2,7 @@
|
|||
#
|
||||
# Makefile for backend/catalog
|
||||
#
|
||||
# $PostgreSQL: pgsql/src/backend/catalog/Makefile,v 1.76 2010/01/06 19:56:29 tgl Exp $
|
||||
# $PostgreSQL: pgsql/src/backend/catalog/Makefile,v 1.77 2010/02/16 22:34:43 tgl Exp $
|
||||
#
|
||||
#-------------------------------------------------------------------------
|
||||
|
||||
|
|
@ -30,7 +30,7 @@ POSTGRES_BKI_SRCS = $(addprefix $(top_srcdir)/src/include/catalog/,\
|
|||
pg_attrdef.h pg_constraint.h pg_inherits.h pg_index.h pg_operator.h \
|
||||
pg_opfamily.h pg_opclass.h pg_am.h pg_amop.h pg_amproc.h \
|
||||
pg_language.h pg_largeobject_metadata.h pg_largeobject.h pg_aggregate.h \
|
||||
pg_statistic.h pg_rewrite.h pg_trigger.h pg_listener.h pg_description.h \
|
||||
pg_statistic.h pg_rewrite.h pg_trigger.h pg_description.h \
|
||||
pg_cast.h pg_enum.h pg_namespace.h pg_conversion.h pg_depend.h \
|
||||
pg_database.h pg_db_role_setting.h pg_tablespace.h pg_pltemplate.h \
|
||||
pg_authid.h pg_auth_members.h pg_shdepend.h pg_shdescription.h \
|
||||
|
|
|
|||
File diff suppressed because it is too large
Load Diff
|
|
@ -15,7 +15,7 @@
|
|||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* IDENTIFICATION
|
||||
* $PostgreSQL: pgsql/src/backend/nodes/copyfuncs.c,v 1.461 2010/02/12 17:33:20 tgl Exp $
|
||||
* $PostgreSQL: pgsql/src/backend/nodes/copyfuncs.c,v 1.462 2010/02/16 22:34:43 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
|
|
@ -2777,6 +2777,7 @@ _copyNotifyStmt(NotifyStmt *from)
|
|||
NotifyStmt *newnode = makeNode(NotifyStmt);
|
||||
|
||||
COPY_STRING_FIELD(conditionname);
|
||||
COPY_STRING_FIELD(payload);
|
||||
|
||||
return newnode;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -22,7 +22,7 @@
|
|||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* IDENTIFICATION
|
||||
* $PostgreSQL: pgsql/src/backend/nodes/equalfuncs.c,v 1.382 2010/02/12 17:33:20 tgl Exp $
|
||||
* $PostgreSQL: pgsql/src/backend/nodes/equalfuncs.c,v 1.383 2010/02/16 22:34:43 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
|
|
@ -1325,6 +1325,7 @@ static bool
|
|||
_equalNotifyStmt(NotifyStmt *a, NotifyStmt *b)
|
||||
{
|
||||
COMPARE_STRING_FIELD(conditionname);
|
||||
COMPARE_STRING_FIELD(payload);
|
||||
|
||||
return true;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -8,7 +8,7 @@
|
|||
*
|
||||
*
|
||||
* IDENTIFICATION
|
||||
* $PostgreSQL: pgsql/src/backend/nodes/outfuncs.c,v 1.382 2010/02/12 17:33:20 tgl Exp $
|
||||
* $PostgreSQL: pgsql/src/backend/nodes/outfuncs.c,v 1.383 2010/02/16 22:34:43 tgl Exp $
|
||||
*
|
||||
* NOTES
|
||||
* Every node type that can appear in stored rules' parsetrees *must*
|
||||
|
|
@ -1820,6 +1820,7 @@ _outNotifyStmt(StringInfo str, NotifyStmt *node)
|
|||
WRITE_NODE_TYPE("NOTIFY");
|
||||
|
||||
WRITE_STRING_FIELD(conditionname);
|
||||
WRITE_STRING_FIELD(payload);
|
||||
}
|
||||
|
||||
static void
|
||||
|
|
|
|||
|
|
@ -8,7 +8,7 @@
|
|||
*
|
||||
*
|
||||
* IDENTIFICATION
|
||||
* $PostgreSQL: pgsql/src/backend/nodes/readfuncs.c,v 1.231 2010/02/12 17:33:20 tgl Exp $
|
||||
* $PostgreSQL: pgsql/src/backend/nodes/readfuncs.c,v 1.232 2010/02/16 22:34:43 tgl Exp $
|
||||
*
|
||||
* NOTES
|
||||
* Path and Plan nodes do not have any readfuncs support, because we
|
||||
|
|
@ -231,6 +231,7 @@ _readNotifyStmt(void)
|
|||
READ_LOCALS(NotifyStmt);
|
||||
|
||||
READ_STRING_FIELD(conditionname);
|
||||
READ_STRING_FIELD(payload);
|
||||
|
||||
READ_DONE();
|
||||
}
|
||||
|
|
|
|||
|
|
@ -11,7 +11,7 @@
|
|||
*
|
||||
*
|
||||
* IDENTIFICATION
|
||||
* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.708 2010/02/12 17:33:20 tgl Exp $
|
||||
* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.709 2010/02/16 22:34:49 tgl Exp $
|
||||
*
|
||||
* HISTORY
|
||||
* AUTHOR DATE MAJOR EVENT
|
||||
|
|
@ -400,7 +400,7 @@ static TypeName *TableFuncTypeName(List *columns);
|
|||
|
||||
%type <ival> Iconst SignedIconst
|
||||
%type <list> Iconst_list
|
||||
%type <str> Sconst comment_text
|
||||
%type <str> Sconst comment_text notify_payload
|
||||
%type <str> RoleId opt_granted_by opt_boolean ColId_or_Sconst
|
||||
%type <list> var_list
|
||||
%type <str> ColId ColLabel var_name type_function_name param_name
|
||||
|
|
@ -6123,14 +6123,20 @@ DropRuleStmt:
|
|||
*
|
||||
*****************************************************************************/
|
||||
|
||||
NotifyStmt: NOTIFY ColId
|
||||
NotifyStmt: NOTIFY ColId notify_payload
|
||||
{
|
||||
NotifyStmt *n = makeNode(NotifyStmt);
|
||||
n->conditionname = $2;
|
||||
n->payload = $3;
|
||||
$$ = (Node *)n;
|
||||
}
|
||||
;
|
||||
|
||||
notify_payload:
|
||||
',' Sconst { $$ = $2; }
|
||||
| /*EMPTY*/ { $$ = NULL; }
|
||||
;
|
||||
|
||||
ListenStmt: LISTEN ColId
|
||||
{
|
||||
ListenStmt *n = makeNode(ListenStmt);
|
||||
|
|
|
|||
|
|
@ -8,7 +8,7 @@
|
|||
*
|
||||
*
|
||||
* IDENTIFICATION
|
||||
* $PostgreSQL: pgsql/src/backend/storage/ipc/ipci.c,v 1.103 2010/01/15 09:19:03 heikki Exp $
|
||||
* $PostgreSQL: pgsql/src/backend/storage/ipc/ipci.c,v 1.104 2010/02/16 22:34:50 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
|
|
@ -20,6 +20,7 @@
|
|||
#include "access/nbtree.h"
|
||||
#include "access/subtrans.h"
|
||||
#include "access/twophase.h"
|
||||
#include "commands/async.h"
|
||||
#include "miscadmin.h"
|
||||
#include "pgstat.h"
|
||||
#include "postmaster/autovacuum.h"
|
||||
|
|
@ -122,6 +123,7 @@ CreateSharedMemoryAndSemaphores(bool makePrivate, int port)
|
|||
size = add_size(size, WalRcvShmemSize());
|
||||
size = add_size(size, BTreeShmemSize());
|
||||
size = add_size(size, SyncScanShmemSize());
|
||||
size = add_size(size, AsyncShmemSize());
|
||||
#ifdef EXEC_BACKEND
|
||||
size = add_size(size, ShmemBackendArraySize());
|
||||
#endif
|
||||
|
|
@ -225,6 +227,7 @@ CreateSharedMemoryAndSemaphores(bool makePrivate, int port)
|
|||
*/
|
||||
BTreeShmemInit();
|
||||
SyncScanShmemInit();
|
||||
AsyncShmemInit();
|
||||
|
||||
#ifdef EXEC_BACKEND
|
||||
|
||||
|
|
|
|||
|
|
@ -15,7 +15,7 @@
|
|||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* IDENTIFICATION
|
||||
* $PostgreSQL: pgsql/src/backend/storage/lmgr/lwlock.c,v 1.55 2010/01/02 16:57:52 momjian Exp $
|
||||
* $PostgreSQL: pgsql/src/backend/storage/lmgr/lwlock.c,v 1.56 2010/02/16 22:34:50 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
|
|
@ -24,6 +24,7 @@
|
|||
#include "access/clog.h"
|
||||
#include "access/multixact.h"
|
||||
#include "access/subtrans.h"
|
||||
#include "commands/async.h"
|
||||
#include "miscadmin.h"
|
||||
#include "pg_trace.h"
|
||||
#include "storage/ipc.h"
|
||||
|
|
@ -174,6 +175,9 @@ NumLWLocks(void)
|
|||
/* multixact.c needs two SLRU areas */
|
||||
numLocks += NUM_MXACTOFFSET_BUFFERS + NUM_MXACTMEMBER_BUFFERS;
|
||||
|
||||
/* async.c needs one per Async buffer */
|
||||
numLocks += NUM_ASYNC_BUFFERS;
|
||||
|
||||
/*
|
||||
* Add any requested by loadable modules; for backwards-compatibility
|
||||
* reasons, allocate at least NUM_USER_DEFINED_LWLOCKS of them even if
|
||||
|
|
|
|||
|
|
@ -8,7 +8,7 @@
|
|||
*
|
||||
*
|
||||
* IDENTIFICATION
|
||||
* $PostgreSQL: pgsql/src/backend/tcop/postgres.c,v 1.589 2010/02/16 20:15:14 momjian Exp $
|
||||
* $PostgreSQL: pgsql/src/backend/tcop/postgres.c,v 1.590 2010/02/16 22:34:50 tgl Exp $
|
||||
*
|
||||
* NOTES
|
||||
* this is the "main" module of the postgres backend and
|
||||
|
|
@ -3779,7 +3779,8 @@ PostgresMain(int argc, char *argv[], const char *username)
|
|||
* collector, and to update the PS stats display. We avoid doing
|
||||
* those every time through the message loop because it'd slow down
|
||||
* processing of batched messages, and because we don't want to report
|
||||
* uncommitted updates (that confuses autovacuum).
|
||||
* uncommitted updates (that confuses autovacuum). The notification
|
||||
* processor wants a call too, if we are not in a transaction block.
|
||||
*/
|
||||
if (send_ready_for_query)
|
||||
{
|
||||
|
|
@ -3795,6 +3796,7 @@ PostgresMain(int argc, char *argv[], const char *username)
|
|||
}
|
||||
else
|
||||
{
|
||||
ProcessCompletedNotifies();
|
||||
pgstat_report_stat(false);
|
||||
|
||||
set_ps_display("idle", false);
|
||||
|
|
|
|||
|
|
@ -10,7 +10,7 @@
|
|||
*
|
||||
*
|
||||
* IDENTIFICATION
|
||||
* $PostgreSQL: pgsql/src/backend/tcop/utility.c,v 1.332 2010/02/14 18:42:15 rhaas Exp $
|
||||
* $PostgreSQL: pgsql/src/backend/tcop/utility.c,v 1.333 2010/02/16 22:34:50 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
|
|
@ -926,17 +926,17 @@ standard_ProcessUtility(Node *parsetree,
|
|||
case T_NotifyStmt:
|
||||
{
|
||||
NotifyStmt *stmt = (NotifyStmt *) parsetree;
|
||||
PreventCommandDuringRecovery();
|
||||
|
||||
Async_Notify(stmt->conditionname);
|
||||
PreventCommandDuringRecovery();
|
||||
Async_Notify(stmt->conditionname, stmt->payload);
|
||||
}
|
||||
break;
|
||||
|
||||
case T_ListenStmt:
|
||||
{
|
||||
ListenStmt *stmt = (ListenStmt *) parsetree;
|
||||
PreventCommandDuringRecovery();
|
||||
|
||||
PreventCommandDuringRecovery();
|
||||
CheckRestrictedOperation("LISTEN");
|
||||
Async_Listen(stmt->conditionname);
|
||||
}
|
||||
|
|
@ -945,8 +945,8 @@ standard_ProcessUtility(Node *parsetree,
|
|||
case T_UnlistenStmt:
|
||||
{
|
||||
UnlistenStmt *stmt = (UnlistenStmt *) parsetree;
|
||||
PreventCommandDuringRecovery();
|
||||
|
||||
PreventCommandDuringRecovery();
|
||||
CheckRestrictedOperation("UNLISTEN");
|
||||
if (stmt->conditionname)
|
||||
Async_Unlisten(stmt->conditionname);
|
||||
|
|
@ -1105,8 +1105,8 @@ standard_ProcessUtility(Node *parsetree,
|
|||
case T_ReindexStmt:
|
||||
{
|
||||
ReindexStmt *stmt = (ReindexStmt *) parsetree;
|
||||
PreventCommandDuringRecovery();
|
||||
|
||||
PreventCommandDuringRecovery();
|
||||
switch (stmt->kind)
|
||||
{
|
||||
case OBJECT_INDEX:
|
||||
|
|
|
|||
|
|
@ -9,7 +9,7 @@
|
|||
*
|
||||
*
|
||||
* IDENTIFICATION
|
||||
* $PostgreSQL: pgsql/src/backend/utils/adt/ruleutils.c,v 1.322 2010/02/14 18:42:16 rhaas Exp $
|
||||
* $PostgreSQL: pgsql/src/backend/utils/adt/ruleutils.c,v 1.323 2010/02/16 22:34:50 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
|
|
@ -3465,6 +3465,11 @@ get_utility_query_def(Query *query, deparse_context *context)
|
|||
0, PRETTYINDENT_STD, 1);
|
||||
appendStringInfo(buf, "NOTIFY %s",
|
||||
quote_identifier(stmt->conditionname));
|
||||
if (stmt->payload)
|
||||
{
|
||||
appendStringInfoString(buf, ", ");
|
||||
simple_quote_literal(buf, stmt->payload);
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
|
|
|
|||
|
|
@ -42,7 +42,7 @@
|
|||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
* Portions taken from FreeBSD.
|
||||
*
|
||||
* $PostgreSQL: pgsql/src/bin/initdb/initdb.c,v 1.184 2010/01/26 16:18:12 tgl Exp $
|
||||
* $PostgreSQL: pgsql/src/bin/initdb/initdb.c,v 1.185 2010/02/16 22:34:50 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
|
|
@ -2458,6 +2458,7 @@ main(int argc, char *argv[])
|
|||
"pg_xlog",
|
||||
"pg_xlog/archive_status",
|
||||
"pg_clog",
|
||||
"pg_notify",
|
||||
"pg_subtrans",
|
||||
"pg_twophase",
|
||||
"pg_multixact/members",
|
||||
|
|
|
|||
|
|
@ -3,7 +3,7 @@
|
|||
*
|
||||
* Copyright (c) 2000-2010, PostgreSQL Global Development Group
|
||||
*
|
||||
* $PostgreSQL: pgsql/src/bin/psql/common.c,v 1.143 2010/01/02 16:57:59 momjian Exp $
|
||||
* $PostgreSQL: pgsql/src/bin/psql/common.c,v 1.144 2010/02/16 22:34:50 tgl Exp $
|
||||
*/
|
||||
#include "postgres_fe.h"
|
||||
#include "common.h"
|
||||
|
|
@ -555,8 +555,13 @@ PrintNotifications(void)
|
|||
|
||||
while ((notify = PQnotifies(pset.db)))
|
||||
{
|
||||
fprintf(pset.queryFout, _("Asynchronous notification \"%s\" received from server process with PID %d.\n"),
|
||||
notify->relname, notify->be_pid);
|
||||
/* for backward compatibility, only show payload if nonempty */
|
||||
if (notify->extra[0])
|
||||
fprintf(pset.queryFout, _("Asynchronous notification \"%s\" with payload \"%s\" received from server process with PID %d.\n"),
|
||||
notify->relname, notify->extra, notify->be_pid);
|
||||
else
|
||||
fprintf(pset.queryFout, _("Asynchronous notification \"%s\" received from server process with PID %d.\n"),
|
||||
notify->relname, notify->be_pid);
|
||||
fflush(pset.queryFout);
|
||||
PQfreemem(notify);
|
||||
}
|
||||
|
|
|
|||
|
|
@ -3,7 +3,7 @@
|
|||
*
|
||||
* Copyright (c) 2000-2010, PostgreSQL Global Development Group
|
||||
*
|
||||
* $PostgreSQL: pgsql/src/bin/psql/tab-complete.c,v 1.193 2010/02/15 02:55:01 itagaki Exp $
|
||||
* $PostgreSQL: pgsql/src/bin/psql/tab-complete.c,v 1.194 2010/02/16 22:34:50 tgl Exp $
|
||||
*/
|
||||
|
||||
/*----------------------------------------------------------------------
|
||||
|
|
@ -1864,7 +1864,7 @@ psql_completion(char *text, int start, int end)
|
|||
|
||||
/* NOTIFY */
|
||||
else if (pg_strcasecmp(prev_wd, "NOTIFY") == 0)
|
||||
COMPLETE_WITH_QUERY("SELECT pg_catalog.quote_ident(relname) FROM pg_catalog.pg_listener WHERE substring(pg_catalog.quote_ident(relname),1,%d)='%s'");
|
||||
COMPLETE_WITH_QUERY("SELECT pg_catalog.quote_ident(channel) FROM pg_catalog.pg_listening_channels() AS channel WHERE substring(pg_catalog.quote_ident(channel),1,%d)='%s'");
|
||||
|
||||
/* OPTIONS */
|
||||
else if (pg_strcasecmp(prev_wd, "OPTIONS") == 0)
|
||||
|
|
@ -2105,7 +2105,7 @@ psql_completion(char *text, int start, int end)
|
|||
|
||||
/* UNLISTEN */
|
||||
else if (pg_strcasecmp(prev_wd, "UNLISTEN") == 0)
|
||||
COMPLETE_WITH_QUERY("SELECT pg_catalog.quote_ident(relname) FROM pg_catalog.pg_listener WHERE substring(pg_catalog.quote_ident(relname),1,%d)='%s' UNION SELECT '*'");
|
||||
COMPLETE_WITH_QUERY("SELECT pg_catalog.quote_ident(channel) FROM pg_catalog.pg_listening_channels() AS channel WHERE substring(pg_catalog.quote_ident(channel),1,%d)='%s' UNION SELECT '*'");
|
||||
|
||||
/* UPDATE */
|
||||
/* If prev. word is UPDATE suggest a list of tables */
|
||||
|
|
|
|||
|
|
@ -6,7 +6,7 @@
|
|||
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $PostgreSQL: pgsql/src/include/access/slru.h,v 1.25 2010/01/02 16:58:00 momjian Exp $
|
||||
* $PostgreSQL: pgsql/src/include/access/slru.h,v 1.26 2010/02/16 22:34:50 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
|
|
@ -17,6 +17,25 @@
|
|||
#include "storage/lwlock.h"
|
||||
|
||||
|
||||
/*
|
||||
* Define SLRU segment size. A page is the same BLCKSZ as is used everywhere
|
||||
* else in Postgres. The segment size can be chosen somewhat arbitrarily;
|
||||
* we make it 32 pages by default, or 256Kb, i.e. 1M transactions for CLOG
|
||||
* or 64K transactions for SUBTRANS.
|
||||
*
|
||||
* Note: because TransactionIds are 32 bits and wrap around at 0xFFFFFFFF,
|
||||
* page numbering also wraps around at 0xFFFFFFFF/xxxx_XACTS_PER_PAGE (where
|
||||
* xxxx is CLOG or SUBTRANS, respectively), and segment numbering at
|
||||
* 0xFFFFFFFF/xxxx_XACTS_PER_PAGE/SLRU_PAGES_PER_SEGMENT. We need
|
||||
* take no explicit notice of that fact in slru.c, except when comparing
|
||||
* segment and page numbers in SimpleLruTruncate (see PagePrecedes()).
|
||||
*
|
||||
* Note: slru.c currently assumes that segment file names will be four hex
|
||||
* digits. This sets a lower bound on the segment size (64K transactions
|
||||
* for 32-bit TransactionIds).
|
||||
*/
|
||||
#define SLRU_PAGES_PER_SEGMENT 32
|
||||
|
||||
/*
|
||||
* Page status codes. Note that these do not include the "dirty" bit.
|
||||
* page_dirty can be TRUE only in the VALID or WRITE_IN_PROGRESS states;
|
||||
|
|
@ -55,8 +74,8 @@ typedef struct SlruSharedData
|
|||
/*
|
||||
* Optional array of WAL flush LSNs associated with entries in the SLRU
|
||||
* pages. If not zero/NULL, we must flush WAL before writing pages (true
|
||||
* for pg_clog, false for multixact and pg_subtrans). group_lsn[] has
|
||||
* lsn_groups_per_page entries per buffer slot, each containing the
|
||||
* for pg_clog, false for multixact, pg_subtrans, pg_notify). group_lsn[]
|
||||
* has lsn_groups_per_page entries per buffer slot, each containing the
|
||||
* highest LSN known for a contiguous group of SLRU entries on that slot's
|
||||
* page.
|
||||
*/
|
||||
|
|
@ -94,7 +113,7 @@ typedef struct SlruCtlData
|
|||
|
||||
/*
|
||||
* This flag tells whether to fsync writes (true for pg_clog and multixact
|
||||
* stuff, false for pg_subtrans).
|
||||
* stuff, false for pg_subtrans and pg_notify).
|
||||
*/
|
||||
bool do_fsync;
|
||||
|
||||
|
|
|
|||
|
|
@ -7,7 +7,7 @@
|
|||
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $PostgreSQL: pgsql/src/include/access/twophase_rmgr.h,v 1.11 2010/01/02 16:58:00 momjian Exp $
|
||||
* $PostgreSQL: pgsql/src/include/access/twophase_rmgr.h,v 1.12 2010/02/16 22:34:50 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
|
|
@ -23,9 +23,8 @@ typedef uint8 TwoPhaseRmgrId;
|
|||
*/
|
||||
#define TWOPHASE_RM_END_ID 0
|
||||
#define TWOPHASE_RM_LOCK_ID 1
|
||||
#define TWOPHASE_RM_NOTIFY_ID 2
|
||||
#define TWOPHASE_RM_PGSTAT_ID 3
|
||||
#define TWOPHASE_RM_MULTIXACT_ID 4
|
||||
#define TWOPHASE_RM_PGSTAT_ID 2
|
||||
#define TWOPHASE_RM_MULTIXACT_ID 3
|
||||
#define TWOPHASE_RM_MAX_ID TWOPHASE_RM_MULTIXACT_ID
|
||||
|
||||
extern const TwoPhaseCallback twophase_recover_callbacks[];
|
||||
|
|
|
|||
|
|
@ -37,7 +37,7 @@
|
|||
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $PostgreSQL: pgsql/src/include/catalog/catversion.h,v 1.584 2010/02/12 17:33:20 tgl Exp $
|
||||
* $PostgreSQL: pgsql/src/include/catalog/catversion.h,v 1.585 2010/02/16 22:34:54 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
|
|
@ -53,6 +53,6 @@
|
|||
*/
|
||||
|
||||
/* yyyymmddN */
|
||||
#define CATALOG_VERSION_NO 201002121
|
||||
#define CATALOG_VERSION_NO 201002161
|
||||
|
||||
#endif
|
||||
|
|
|
|||
|
|
@ -1,59 +0,0 @@
|
|||
/*-------------------------------------------------------------------------
|
||||
*
|
||||
* pg_listener.h
|
||||
* Asynchronous notification
|
||||
*
|
||||
*
|
||||
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $PostgreSQL: pgsql/src/include/catalog/pg_listener.h,v 1.28 2010/01/05 01:06:56 tgl Exp $
|
||||
*
|
||||
* NOTES
|
||||
* the genbki.pl script reads this file and generates .bki
|
||||
* information from the DATA() statements.
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
#ifndef PG_LISTENER_H
|
||||
#define PG_LISTENER_H
|
||||
|
||||
#include "catalog/genbki.h"
|
||||
|
||||
/* ----------------------------------------------------------------
|
||||
* pg_listener definition.
|
||||
*
|
||||
* cpp turns this into typedef struct FormData_pg_listener
|
||||
* ----------------------------------------------------------------
|
||||
*/
|
||||
#define ListenerRelationId 2614
|
||||
|
||||
CATALOG(pg_listener,2614) BKI_WITHOUT_OIDS
|
||||
{
|
||||
NameData relname;
|
||||
int4 listenerpid;
|
||||
int4 notification;
|
||||
} FormData_pg_listener;
|
||||
|
||||
/* ----------------
|
||||
* Form_pg_listener corresponds to a pointer to a tuple with
|
||||
* the format of pg_listener relation.
|
||||
* ----------------
|
||||
*/
|
||||
typedef FormData_pg_listener *Form_pg_listener;
|
||||
|
||||
/* ----------------
|
||||
* compiler constants for pg_listener
|
||||
* ----------------
|
||||
*/
|
||||
#define Natts_pg_listener 3
|
||||
#define Anum_pg_listener_relname 1
|
||||
#define Anum_pg_listener_listenerpid 2
|
||||
#define Anum_pg_listener_notification 3
|
||||
|
||||
/* ----------------
|
||||
* initial contents of pg_listener are NOTHING.
|
||||
* ----------------
|
||||
*/
|
||||
|
||||
#endif /* PG_LISTENER_H */
|
||||
|
|
@ -7,7 +7,7 @@
|
|||
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $PostgreSQL: pgsql/src/include/catalog/pg_proc.h,v 1.568 2010/02/07 20:48:11 tgl Exp $
|
||||
* $PostgreSQL: pgsql/src/include/catalog/pg_proc.h,v 1.569 2010/02/16 22:34:56 tgl Exp $
|
||||
*
|
||||
* NOTES
|
||||
* The script catalog/genbki.pl reads this file and generates .bki
|
||||
|
|
@ -4131,8 +4131,12 @@ DATA(insert OID = 2599 ( pg_timezone_abbrevs PGNSP PGUID 12 1 1000 0 f f f t t
|
|||
DESCR("get the available time zone abbreviations");
|
||||
DATA(insert OID = 2856 ( pg_timezone_names PGNSP PGUID 12 1 1000 0 f f f t t s 0 0 2249 "" "{25,25,1186,16}" "{o,o,o,o}" "{name,abbrev,utc_offset,is_dst}" _null_ pg_timezone_names _null_ _null_ _null_ ));
|
||||
DESCR("get the available time zone names");
|
||||
DATA(insert OID = 2730 ( pg_get_triggerdef PGNSP PGUID 12 1 0 0 f f f t f s 2 0 25 "26 16" _null_ _null_ _null_ _null_ pg_get_triggerdef_ext _null_ _null_ _null_ ));
|
||||
DATA(insert OID = 2730 ( pg_get_triggerdef PGNSP PGUID 12 1 0 0 f f f t f s 2 0 25 "26 16" _null_ _null_ _null_ _null_ pg_get_triggerdef_ext _null_ _null_ _null_ ));
|
||||
DESCR("trigger description with pretty-print option");
|
||||
DATA(insert OID = 3035 ( pg_listening_channels PGNSP PGUID 12 1 10 0 f f f t t s 0 0 25 "" _null_ _null_ _null_ _null_ pg_listening_channels _null_ _null_ _null_ ));
|
||||
DESCR("get the channels that the current backend listens to");
|
||||
DATA(insert OID = 3036 ( pg_notify PGNSP PGUID 12 1 0 0 f f f f f v 2 0 2278 "25 25" _null_ _null_ _null_ _null_ pg_notify _null_ _null_ _null_ ));
|
||||
DESCR("send a notification event");
|
||||
|
||||
/* non-persistent series generator */
|
||||
DATA(insert OID = 1066 ( generate_series PGNSP PGUID 12 1 1000 0 f f f t t i 3 0 23 "23 23 23" _null_ _null_ _null_ _null_ generate_series_step_int4 _null_ _null_ _null_ ));
|
||||
|
|
|
|||
|
|
@ -6,28 +6,44 @@
|
|||
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $PostgreSQL: pgsql/src/include/commands/async.h,v 1.39 2010/01/02 16:58:03 momjian Exp $
|
||||
* $PostgreSQL: pgsql/src/include/commands/async.h,v 1.40 2010/02/16 22:34:57 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
#ifndef ASYNC_H
|
||||
#define ASYNC_H
|
||||
|
||||
#include "fmgr.h"
|
||||
|
||||
/*
|
||||
* The number of SLRU page buffers we use for the notification queue.
|
||||
*/
|
||||
#define NUM_ASYNC_BUFFERS 8
|
||||
|
||||
extern bool Trace_notify;
|
||||
|
||||
extern Size AsyncShmemSize(void);
|
||||
extern void AsyncShmemInit(void);
|
||||
|
||||
/* notify-related SQL statements */
|
||||
extern void Async_Notify(const char *relname);
|
||||
extern void Async_Listen(const char *relname);
|
||||
extern void Async_Unlisten(const char *relname);
|
||||
extern void Async_Notify(const char *channel, const char *payload);
|
||||
extern void Async_Listen(const char *channel);
|
||||
extern void Async_Unlisten(const char *channel);
|
||||
extern void Async_UnlistenAll(void);
|
||||
|
||||
/* notify-related SQL functions */
|
||||
extern Datum pg_listening_channels(PG_FUNCTION_ARGS);
|
||||
extern Datum pg_notify(PG_FUNCTION_ARGS);
|
||||
|
||||
/* perform (or cancel) outbound notify processing at transaction commit */
|
||||
extern void PreCommit_Notify(void);
|
||||
extern void AtCommit_Notify(void);
|
||||
extern void AtAbort_Notify(void);
|
||||
extern void AtSubStart_Notify(void);
|
||||
extern void AtSubCommit_Notify(void);
|
||||
extern void AtSubAbort_Notify(void);
|
||||
extern void AtPrepare_Notify(void);
|
||||
extern void ProcessCompletedNotifies(void);
|
||||
|
||||
/* signal handler for inbound notifies (PROCSIG_NOTIFY_INTERRUPT) */
|
||||
extern void HandleNotifyInterrupt(void);
|
||||
|
|
@ -40,7 +56,4 @@ extern void HandleNotifyInterrupt(void);
|
|||
extern void EnableNotifyInterrupt(void);
|
||||
extern bool DisableNotifyInterrupt(void);
|
||||
|
||||
extern void notify_twophase_postcommit(TransactionId xid, uint16 info,
|
||||
void *recdata, uint32 len);
|
||||
|
||||
#endif /* ASYNC_H */
|
||||
|
|
|
|||
|
|
@ -13,7 +13,7 @@
|
|||
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $PostgreSQL: pgsql/src/include/nodes/parsenodes.h,v 1.429 2010/02/12 17:33:20 tgl Exp $
|
||||
* $PostgreSQL: pgsql/src/include/nodes/parsenodes.h,v 1.430 2010/02/16 22:34:57 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
|
|
@ -2097,6 +2097,7 @@ typedef struct NotifyStmt
|
|||
{
|
||||
NodeTag type;
|
||||
char *conditionname; /* condition name to notify */
|
||||
char *payload; /* the payload string, or NULL if none */
|
||||
} NotifyStmt;
|
||||
|
||||
/* ----------------------
|
||||
|
|
|
|||
|
|
@ -7,7 +7,7 @@
|
|||
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $PostgreSQL: pgsql/src/include/storage/lwlock.h,v 1.44 2010/02/07 20:48:13 tgl Exp $
|
||||
* $PostgreSQL: pgsql/src/include/storage/lwlock.h,v 1.45 2010/02/16 22:34:57 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
|
|
@ -68,6 +68,8 @@ typedef enum LWLockId
|
|||
AutovacuumScheduleLock,
|
||||
SyncScanLock,
|
||||
RelationMappingLock,
|
||||
AsyncCtlLock,
|
||||
AsyncQueueLock,
|
||||
/* Individual lock IDs end here */
|
||||
FirstBufMappingLock,
|
||||
FirstLockMgrLock = FirstBufMappingLock + NUM_BUFFER_PARTITIONS,
|
||||
|
|
|
|||
|
|
@ -532,9 +532,9 @@ CREATE TEMP TABLE tmp_foo (data text) ON COMMIT DELETE ROWS;
|
|||
CREATE ROLE temp_reset_user;
|
||||
SET SESSION AUTHORIZATION temp_reset_user;
|
||||
-- look changes
|
||||
SELECT relname FROM pg_listener;
|
||||
relname
|
||||
-----------
|
||||
SELECT pg_listening_channels();
|
||||
pg_listening_channels
|
||||
-----------------------
|
||||
foo_event
|
||||
(1 row)
|
||||
|
||||
|
|
@ -571,9 +571,9 @@ SELECT current_user = 'temp_reset_user';
|
|||
-- discard everything
|
||||
DISCARD ALL;
|
||||
-- look again
|
||||
SELECT relname FROM pg_listener;
|
||||
relname
|
||||
---------
|
||||
SELECT pg_listening_channels();
|
||||
pg_listening_channels
|
||||
-----------------------
|
||||
(0 rows)
|
||||
|
||||
SELECT name FROM pg_prepared_statements;
|
||||
|
|
|
|||
|
|
@ -107,7 +107,6 @@ SELECT relname, relhasindex
|
|||
pg_language | t
|
||||
pg_largeobject | t
|
||||
pg_largeobject_metadata | t
|
||||
pg_listener | f
|
||||
pg_namespace | t
|
||||
pg_opclass | t
|
||||
pg_operator | t
|
||||
|
|
@ -154,7 +153,7 @@ SELECT relname, relhasindex
|
|||
timetz_tbl | f
|
||||
tinterval_tbl | f
|
||||
varchar_tbl | f
|
||||
(143 rows)
|
||||
(142 rows)
|
||||
|
||||
--
|
||||
-- another sanity check: every system catalog that has OIDs should have
|
||||
|
|
|
|||
|
|
@ -165,7 +165,7 @@ CREATE TEMP TABLE tmp_foo (data text) ON COMMIT DELETE ROWS;
|
|||
CREATE ROLE temp_reset_user;
|
||||
SET SESSION AUTHORIZATION temp_reset_user;
|
||||
-- look changes
|
||||
SELECT relname FROM pg_listener;
|
||||
SELECT pg_listening_channels();
|
||||
SELECT name FROM pg_prepared_statements;
|
||||
SELECT name FROM pg_cursors;
|
||||
SHOW vacuum_cost_delay;
|
||||
|
|
@ -174,7 +174,7 @@ SELECT current_user = 'temp_reset_user';
|
|||
-- discard everything
|
||||
DISCARD ALL;
|
||||
-- look again
|
||||
SELECT relname FROM pg_listener;
|
||||
SELECT pg_listening_channels();
|
||||
SELECT name FROM pg_prepared_statements;
|
||||
SELECT name FROM pg_cursors;
|
||||
SHOW vacuum_cost_delay;
|
||||
|
|
|
|||
Loading…
Reference in New Issue