Enable bushy and right-hand queries by default.
This commit is contained in:
Bruce Momjian
parent
65ccd1039a
commit
b4e7510e09
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@ -413,64 +413,12 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
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<para>
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The frontend may be initialized by setting PGGEQO
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environment variable.
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<variablelist>
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<varlistentry>
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<term>
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R_PLANS
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</term>
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<listitem>
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<para>
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Determines whether right-hand plan evaluation is allowed:
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</para>
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<variablelist>
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<varlistentry>
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<term>
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On
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</term>
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<listitem>
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<para>
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enables right-hand evaluation of plans.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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Off
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</term>
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<listitem>
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<para>
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disables right-hand evaluation of plans.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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DEFAULT
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</term>
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<listitem>
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<para>
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Equivalent to specifying <command>SET R_PLANS='off'</command>.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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<para>
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It may be useful when joining big relations with
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small ones. This algorithm is off by default.
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It's not used by GEQO anyway.
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</para>
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<para>
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The frontend may be initialized by setting the PGRPLANS
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environment variable.
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<variablelist>
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<varlistentry>
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<term>
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@ -527,7 +475,7 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
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It's not used by GEQO anyway.
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</para>
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<para>
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The frontend may be initialized by setting the PGRPLANS
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The frontend may be initialized by setting the PGKSQO
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environment variable.
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<variablelist>
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<varlistentry>
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@ -686,11 +634,6 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
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--
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SET GEQO = DEFAULT;
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</programlisting>
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<programlisting>
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--Turn on right-hand evaluation of plans:
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--
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SET R_PLANS TO 'on';
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</programlisting>
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<programlisting>
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--set the timezone for Berkeley, California:
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SET TIME ZONE 'PST8PDT';
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@ -2,7 +2,7 @@
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* Routines for handling of 'SET var TO',
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* 'SHOW var' and 'RESET var' statements.
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*
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* $Id: variable.c,v 1.18 1998/12/18 09:10:20 vadim Exp $
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* $Id: variable.c,v 1.19 1999/02/18 06:00:44 momjian Exp $
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*
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*/
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@ -36,9 +36,6 @@ static bool parse_cost_heap(const char *);
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static bool show_cost_index(void);
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static bool reset_cost_index(void);
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static bool parse_cost_index(const char *);
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static bool show_r_plans(void);
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static bool reset_r_plans(void);
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static bool parse_r_plans(const char *);
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static bool reset_geqo(void);
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static bool show_geqo(void);
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static bool parse_geqo(const char *);
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@ -58,7 +55,6 @@ extern Cost _cpu_page_wight_;
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extern Cost _cpu_index_page_wight_;
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extern bool _use_geqo_;
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extern int32 _use_geqo_rels_;
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extern bool _use_right_sided_plans_;
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extern bool _use_keyset_query_optimizer;
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/*
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@ -242,53 +238,6 @@ reset_geqo(void)
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return TRUE;
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}
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/*
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*
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* R_PLANS
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*
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*/
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static bool
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parse_r_plans(const char *value)
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{
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if (value == NULL)
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{
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reset_r_plans();
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return TRUE;
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}
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if (strcasecmp(value, "on") == 0)
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_use_right_sided_plans_ = true;
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else if (strcasecmp(value, "off") == 0)
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_use_right_sided_plans_ = false;
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else
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elog(ERROR, "Bad value for Right-sided Plans (%s)", value);
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return TRUE;
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}
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static bool
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show_r_plans()
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{
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if (_use_right_sided_plans_)
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elog(NOTICE, "Right-sided Plans are ON");
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else
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elog(NOTICE, "Right-sided Plans are OFF");
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return TRUE;
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}
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static bool
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reset_r_plans()
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{
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#ifdef USE_RIGHT_SIDED_PLANS
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_use_right_sided_plans_ = true;
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#else
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_use_right_sided_plans_ = false;
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#endif
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return TRUE;
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}
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/*
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*
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* COST_HEAP
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@ -659,9 +608,6 @@ struct VariableParsers
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{
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"geqo", parse_geqo, show_geqo, reset_geqo
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},
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{
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"r_plans", parse_r_plans, show_r_plans, reset_r_plans
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},
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#ifdef MULTIBYTE
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{
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"client_encoding", parse_client_encoding, show_client_encoding, reset_client_encoding
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@ -7,7 +7,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/optimizer/path/joinrels.c,v 1.29 1999/02/18 05:26:19 momjian Exp $
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* $Header: /cvsroot/pgsql/src/backend/optimizer/path/joinrels.c,v 1.30 1999/02/18 06:00:46 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -23,14 +23,6 @@
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#include "optimizer/joininfo.h"
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#include "optimizer/pathnode.h"
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#ifdef USE_RIGHT_SIDED_PLANS
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bool _use_right_sided_plans_ = true;
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#else
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bool _use_right_sided_plans_ = false;
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#endif
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static List *new_joininfo_list(List *joininfo_list, Relids join_relids);
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static bool nonoverlap_sets(List *s1, List *s2);
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static bool is_subset(List *s1, List *s2);
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@ -122,8 +114,7 @@ make_rels_by_clause_joins(Query *root, RelOptInfo *old_rel,
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join_list = lappend(join_list, joined_rel);
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/* Right-sided plan */
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if (_use_right_sided_plans_ &&
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length(old_rel->relids) > 1)
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if (length(old_rel->relids) > 1)
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{
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joined_rel = make_join_rel(
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get_base_rel(root, lfirsti(unjoined_relids)),
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@ -133,7 +124,7 @@ make_rels_by_clause_joins(Query *root, RelOptInfo *old_rel,
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}
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}
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if (BushyPlanFlag && only_relids == NIL) /* no bushy from geqo */
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if (only_relids == NIL) /* no bushy from geqo */
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{
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List *r;
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@ -7,7 +7,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/tcop/postgres.c,v 1.102 1999/02/18 05:26:24 momjian Exp $
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* $Header: /cvsroot/pgsql/src/backend/tcop/postgres.c,v 1.103 1999/02/18 06:00:49 momjian Exp $
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*
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* NOTES
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* this is the "main" module of the postgres backend and
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@ -907,7 +907,7 @@ usage(char *progname)
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fprintf(stderr,
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"Usage: %s [options] [dbname]\n", progname);
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#ifdef USE_ASSERT_CHECKING
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fprintf(stderr, " A: enable/disable assert checking\n");
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fprintf(stderr, "\t-A enable/disable assert checking\n");
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#endif
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fprintf(stderr, "\t-B buffers\tset number of buffers in buffer pool\n");
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fprintf(stderr, "\t-C \t\tsupress version info\n");
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@ -1017,7 +1017,7 @@ PostgresMain(int argc, char *argv[], int real_argc, char *real_argv[])
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optind = 1; /* reset after postmaster usage */
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while ((flag = getopt(argc, argv,
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"A:B:bCD:d:Eef:iK:Lm:MNo:P:pQS:st:v:x:FW:"))
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"A:B:CD:d:Eef:iK:Lm:MNo:P:pQS:st:v:x:FW:"))
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!= EOF)
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switch (flag)
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{
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@ -1522,7 +1522,7 @@ PostgresMain(int argc, char *argv[], int real_argc, char *real_argv[])
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if (!IsUnderPostmaster)
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{
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puts("\nPOSTGRES backend interactive interface ");
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puts("$Revision: 1.102 $ $Date: 1999/02/18 05:26:24 $\n");
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puts("$Revision: 1.103 $ $Date: 1999/02/18 06:00:49 $\n");
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}
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/* ----------------
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@ -7,7 +7,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-connect.c,v 1.92 1999/02/13 23:22:40 momjian Exp $
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* $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-connect.c,v 1.93 1999/02/18 06:01:00 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -136,9 +136,6 @@ static struct EnvironmentOptions
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{
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"PGCOSTINDEX", "cost_index"
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},
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{
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"PGRPLANS", "r_plans"
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},
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{
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"PGGEQO", "geqo"
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},
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@ -1,6 +1,6 @@
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.\" This is -*-nroff-*-
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.\" XXX standard disclaimer belongs here....
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.\" $Header: /cvsroot/pgsql/src/man/Attic/set.l,v 1.14 1999/02/14 04:57:02 momjian Exp $
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.\" $Header: /cvsroot/pgsql/src/man/Attic/set.l,v 1.15 1999/02/18 06:01:11 momjian Exp $
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.TH SET SQL 05/14/97 PostgreSQL PostgreSQL
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.SH NAME
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set - set run-time parameters for session
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@ -60,24 +60,6 @@ for more information.
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on=10 - use for statements with 10 or more tables
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off - do not use the genetic optimizer
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.fi
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.PP
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.IR R_PLANS
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enables or disables right-hand evaluation of plans. It may be useful
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when joining big relations with small ones. This algorithm is
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.IR off
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by default. It's not used by GEQO anyway.
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.if n .ta 5 +15 +40
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.if t .ta 0.5i +1.5i +3.0i
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.in 0
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.nf
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.ce 1
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\fBR_PLANS Values\fR
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on - turn right-hand plan evaluation 'on'
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off - do not use right-hand plan evaluation
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.fi
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.PP
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.IR QUERY_LIMIT
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restricts the number of rows returned by a query.
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