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Bruce Momjian
1998-07-21 04:19:44 +00:00
parent e0058b6172
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src/tools/backend/index.html
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@ -10,7 +10,39 @@ How PostgreSQL Processes a Query
by Bruce Momjian by Bruce Momjian
</H2> </H2>
<P> <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 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 or Unix Domain sockets. It is loaded into a string, and passed to
the the
@ -87,40 +119,6 @@ They can be accessed by clicking on the flowchart.
<HR> <HR>
<P> <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 Another area of interest is the shared memory area, which contains data
accessable to all backends. It has table recently used data/index accessable to all backends. It has table recently used data/index
blocks, locks, backend information, and lookup tables for these blocks, locks, backend information, and lookup tables for these