opensourcemirror
/
postgresql
mirror of git://git.postgresql.org/git/postgresql.git
1
0
Fork 0
Code Issues Releases Wiki Activity

Update.

This commit is contained in:
Bruce Momjian 1998-07-21 04:19:44 +00:00
parent e0058b6172
commit 7f61f8a71f
1 changed files with 32 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

66
src/tools/backend/index.html
View File

@ -10,7 +10,39 @@ How PostgreSQL Processes a Query
by Bruce Momjian
</H2>
<P>
<CENTER>
<EM><BIG>
Click on an item to see more detail or look at the full
<A HREF="backend_dirs.html">index.</A>
</BIG></EM>
<BR>
<BR>
<IMG src="flow.jpg" usemap="#flowmap" alt="flowchart">
</CENTER>
<MAP name="flowmap">
<AREA COORDS="290,10,450,50" HREF="backend_dirs.html#main">
<AREA COORDS="550,10,710,50" HREF="backend_dirs.html#bootstrap">
<AREA COORDS="290,90,450,130," HREF="backend_dirs.html#postmaster">
<AREA COORDS="550,90,710,130," HREF="backend_dirs.html#libpq">
<AREA COORDS="290,170,450,210" HREF="backend_dirs.html#tcop">
<AREA COORDS="550,170,710,210" HREF="backend_dirs.html#tcop">
<AREA COORDS="290,270,450,310" HREF="backend_dirs.html#parser">
<AREA COORDS="290,350,450,390" HREF="backend_dirs.html#tcop">
<AREA COORDS="290,430,450,470" HREF="backend_dirs.html#optimizer">
<AREA COORDS="290,510,450,550" HREF="backend_dirs.html#optimizer/plan">
<AREA COORDS="290,570,450,630" HREF="backend_dirs.html#executor">
<AREA COORDS="550,350,710,390" HREF="backend_dirs.html#commands">
<AREA COORDS="10,330,170,370" HREF="backend_dirs.html#access">
<AREA COORDS="10,390,170,430" HREF="backend_dirs.html#catalog">
<AREA COORDS="10,450,170,490" HREF="backend_dirs.html#utils">
<AREA COORDS="10,510,170,550" HREF="backend_dirs.html#nodes">
<AREA COORDS="10,570,170,610" HREF="backend_dirs.html#storage">
</MAP>
<BR>
<P>
<HR>
<P>
A query comes to the backend via data packets arriving through TCP/IP
or Unix Domain sockets. It is loaded into a string, and passed to
the
@ -87,40 +119,6 @@ They can be accessed by clicking on the flowchart.
<HR>
<P>
<CENTER>
<EM><BIG>
Click on an item to see more detail or look at the full
<A HREF="backend_dirs.html">index.</A>
</BIG></EM>
<BR>
<BR>
<IMG src="flow.jpg" usemap="#flowmap" alt="flowchart">
</CENTER>
<MAP name="flowmap">
<AREA COORDS="290,10,450,50" HREF="backend_dirs.html#main">
<AREA COORDS="550,10,710,50" HREF="backend_dirs.html#bootstrap">
<AREA COORDS="290,90,450,130," HREF="backend_dirs.html#postmaster">
<AREA COORDS="550,90,710,130," HREF="backend_dirs.html#libpq">
<AREA COORDS="290,170,450,210" HREF="backend_dirs.html#tcop">
<AREA COORDS="550,170,710,210" HREF="backend_dirs.html#tcop">
<AREA COORDS="290,270,450,310" HREF="backend_dirs.html#parser">
<AREA COORDS="290,350,450,390" HREF="backend_dirs.html#tcop">
<AREA COORDS="290,430,450,470" HREF="backend_dirs.html#optimizer">
<AREA COORDS="290,510,450,550" HREF="backend_dirs.html#optimizer/plan">
<AREA COORDS="290,570,450,630" HREF="backend_dirs.html#executor">
<AREA COORDS="550,350,710,390" HREF="backend_dirs.html#commands">
<AREA COORDS="10,330,170,370" HREF="backend_dirs.html#access">
<AREA COORDS="10,390,170,430" HREF="backend_dirs.html#catalog">
<AREA COORDS="10,450,170,490" HREF="backend_dirs.html#utils">
<AREA COORDS="10,510,170,550" HREF="backend_dirs.html#nodes">
<AREA COORDS="10,570,170,610" HREF="backend_dirs.html#storage">
</MAP>
<BR>
<P>
<HR>
<P>
Another area of interest is the shared memory area, which contains data
accessable to all backends. It has table recently used data/index
blocks, locks, backend information, and lookup tables for these