#20237 [Bgs]: pg_pconnect, too many connections

ID: 20237 Updated by: iliaa@php.net Reported By: anders@gatefive.fi Status: Bogus Bug Type: PostgreSQL related Operating System: linux PHP Version: 4.2.3 New Comment: It is possible that db also comes into play, however another possibility is that you have non-apache related connections being made, which raises your overall connection count. Previous Comments: ------------------------------------------------------------------------ [2002-11-04 08:05:47] anders@gatefive.fi Addition: 1 user, 3 dbs in 1 posgres backend apache has maxclients at 150 max_connections in postgres set to 600 - still not enough. anyway I calculate it, it still doesn't sum up Is it: users * db * maxclients or users * maxclients (first would equal 450, second 150) ------------------------------------------------------------------------ [2002-11-04 08:01:31] anders@gatefive.fi That i did know, but as I mentioned, the connections are being made by only 1 user, so it therefore seems as if there would be something funny going on.. That would lead us to a max of 150 connections - even 600 wasn't enough.. ------------------------------------------------------------------------ [2002-11-04 07:49:03] iliaa@php.net Thank you for taking the time to write to us, but this is not a bug. Please double-check the documentation available at http://www.php.net/manual/ and the instructions on how to report a bug at http://bugs.php.net/how-to-report.php When using persistant connections each Apache child eventually will have an open connection. Now, if have many users, then this translates to connection per user per apache child. So, with 20 different users connecting to PostgreSQL and 100 Apache children, you could see as many as 2000 open connections. ------------------------------------------------------------------------ [2002-11-04 02:56:50] anders@gatefive.fi I am not sure if this is a pgsql-extension bug or merely an documentation bug. I have had problems with a webserver, getting php-error saying too many connections, when using persistent connections. It seems mysql behaves like: (apache) MaxClients * persistant-connections whereas this is in postgres more like: MaxClients * DBs * users * persistant connections (not mentioned anywhere in docs). OR php have troubles finding allready opened connections in its hashtable. (PHP 4.2.3, postgres 7.1.3) It seems strange to have different pconnects to same postgres backend if different databases (seems the source selects DB on the open connection anyhow). background: apache maxclients = 150, 1 user a few DBs and postgress max_connections limit set to 600 ! and it wasn't enough. (fix: changed everything from pg_pconnect to pg_connect). ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=20237&edit=1