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Full Discussion: postgresql issues - system running really slow
Operating Systems Linux Red Hat postgresql issues - system running really slow Post 302275843 by jim mcnamara on Monday 12th of January 2009 10:06:47 AM
Old 01-12-2009
If the system is that old, I will assume you have a LOT of rows in your tables, unless you are actively purging and archiving data. Based on what you say, and if iostat does not show bottlenecks then it very probably has to be a db problem.

you did check iostat, right?

First: Look into record chaining. This occurs when you have updates applied to old records. Over time a full table scan on certain columns becomes almost impossible, time-wise. iostat will report more I/O because of chaining, but basically chaining can defeat disk and software caching and LRU strategies.
 

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LEARN ABOUT CENTOS

postgresql-setup

POSTGRESQL-SETUP(1)					    Postgresql RPM-dist manual					       POSTGRESQL-SETUP(1)

NAME

       postgresql-setup - manual page for postgresql-setup 9.2.7

SYNOPSIS

       postgresql-setup {initdb|upgrade} [SERVICE_NAME]

DESCRIPTION

       Script is aimed to help sysadmin with basic database cluster administration.

       The  SERVICE_NAME  is used for selection of proper unit configuration file; For more info and howto/when use this script please look at the
       docu file /usr/share/doc/postgresql-9.2.7/README.rpm-dist.  The 'postgresql' string is used when no SERVICE_NAME is explicitly passed.

   Available operation mode:
       initdb Create a new PostgreSQL database cluster.  This is usually the first action you perform after PostgreSQL server installation.

       upgrade
	      Upgrade PostgreSQL database cluster to be usable with new server.  Use this if you upgraded your PostgreSQL server  to  newer  major
	      version (currently from 8.4 to 9.2).

ENVIRONMENT

       PGSETUP_INITDB_OPTIONS
	      Options  carried	by this variable are passed to subsequent call of `initdb` binary (see man initdb(1)).	This variable is used also
	      during 'upgrade' mode because the new cluster is actually re-initialized from the old one.

       PGSETUP_PGUPGRADE_OPTIONS
	      Options in this variable are passed next to the subsequent call of `pg_upgrade`.	For more info about possible options  please  look
	      at man pg_upgrade(1).

       PGSETUP_DEBUG
	      Set to '1' if you want to see debugging output.

postgresql-setup 9.2.7						     June 2014						       POSTGRESQL-SETUP(1)
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