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Update connections FAQ item.

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Bruce Momjian
2005-02-01 00:19:15 +00:00
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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)
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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?