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Bruce Momjian 2001-09-07 00:51:10 +00:00
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<H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1>
<P>Last updated: Thu Sep 6 20:45:54 EDT 2001</P>
<P>Last updated: Thu Sep 6 20:51:03 EDT 2001</P>
<P>Current maintainer: Bruce Momjian (<A href=
"mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</A>)<BR>
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<P>You need to increase the <I>postmaster's</I> limit on how many
concurrent backend processes it can start.</P>
<P>In PostgreSQL 6.5 and up, the default limit is 32 processes. You
can increase it by restarting the <I>postmaster</I> with a suitable
<I>-N</I> value. With the default configuration you can set
<I>-N</I> as large as 1024. If you need more, increase
<SMALL>MAXBACKENDS</SMALL> in <I>include/pg_config.h</I> and rebuild.
You can set the default value of <I>-N</I> at configuration time,
if you like, using <I>configure's</I> <I>--with-maxbackends</I>
switch.</P>
<P>The default limit is 32 processes. You can increase it by
restarting the <I>postmaster</I> with a suitable <I>-N</I> value or
modifying <I>postgresql.conf</I>.</P>
<P>Note that if you make <I>-N</I> larger than 32, you must also
increase <I>-B</I> beyond its default of 64; <I>-B</I> must be at