Frequently Asked Questions (FAQ) for PostgreSQL
- Last updated: Mon Jan 31 17:58:50 EST 2005
+ Last updated: Mon Jan 31 19:18:44 EST 2005
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
3.5) Why do I get "Sorry, too many clients" when trying to connect?
- You need to increase postmaster's limit on how many concurrent backend
- processes it can start.
-
- The default limit is 32 processes. You can increase it by restarting
- postmaster with a suitable -N value or modifying postgresql.conf.
-
- Note that if you make -N larger than 32, you must also increase -B
- beyond its default of 64; -B must be at least twice -N, and probably
- should be more than that for best performance. For large numbers of
- backend processes, you are also likely to find that you need to
- increase various Unix kernel configuration parameters. Things to check
- include the maximum size of shared memory blocks, SHMMAX; the maximum
- number of semaphores, SEMMNS and SEMMNI; the maximum number of
- processes, NPROC; the maximum number of processes per user, MAXUPRC;
- and the maximum number of open files, NFILE and NINODE. The reason
- that PostgreSQL has a limit on the number of allowed backend processes
- is so your system won't run out of resources.
+ You have reached the default limit is 100 database sessions. You need
+ to increase the postmaster's limit on how many concurrent backend
+ processes it can start by changing the max_connections value in
+ postgresql.conf and restarting the postmaster.
3.6) What is in the pgsql_tmp directory?
alink="#0000ff">
<H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1>
- <P>Last updated: Mon Jan 31 17:58:50 EST 2005</P>
+ <P>Last updated: Mon Jan 31 19:18:44 EST 2005</P>
<P>Current maintainer: Bruce Momjian (<A href=
"mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</A>)
<H4><A name="3.5">3.5</A>) Why do I get <I>"Sorry, too many
clients"</I> when trying to connect?</H4>
- <P>You need to increase <I>postmaster</I>'s limit on how many
- concurrent backend processes it can start.</P>
-
- <P>The default limit is 32 processes. You can increase it by
- restarting <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
- least twice <I>-N</I>, and probably should be more than that for
- best performance. For large numbers of backend processes, you are
- also likely to find that you need to increase various Unix kernel
- configuration parameters. Things to check include the maximum size
- of shared memory blocks, <SMALL>SHMMAX;</SMALL> the maximum number
- of semaphores, <SMALL>SEMMNS</SMALL> and <SMALL>SEMMNI;</SMALL> the
- maximum number of processes, <SMALL>NPROC;</SMALL> the maximum
- number of processes per user, <SMALL>MAXUPRC;</SMALL> and the
- maximum number of open files, <SMALL>NFILE</SMALL> and
- <SMALL>NINODE</SMALL>. The reason that PostgreSQL has a limit on
- the number of allowed backend processes is so your system won't run
- out of resources.</P>
+ You have reached the default limit is 100 database sessions. You
+ need to increase the <I>postmaster</I>'s limit on how many
+ concurrent backend processes it can start by changing the
+ <I>max_connections</I> value in <I>postgresql.conf</I> and
+ restarting the <I>postmaster</I>.</P>
<H4><A name="3.6">3.6</A>) What is in the <I>pgsql_tmp</I> directory?</H4>