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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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PG_CTLCLUSTER(8)					 Debian PostgreSQL infrastructure					  PG_CTLCLUSTER(8)

NAME
pg_ctlcluster - start/stop/restart/reload a PostgreSQL cluster SYNOPSIS
pg_ctlcluster [options] cluster-version cluster-name action -- [pg_ctl options] where action = start|stop|restart|reload|promote DESCRIPTION
This program controls the postmaster server for a particular cluster. It essentially wraps the pg_ctl(1) command. It determines the cluster version and data path and calls the right version of pg_ctl with appropriate configuration parameters and paths. You have to start this program as the user who owns the database cluster or as root. ACTIONS
start A log file for this specific cluster is created if it does not exist yet (by default, /var/log/postgresql/postgresql-cluster- version-cluster-name.log), and a PostreSQL server process (postmaster(1)) is started on it. Exits with 0 on success, with 2 if the server is already running, and with 1 on other failure conditions. stop Stops the postmaster(1) server of the given cluster. By default, "smart" mode is used, which waits until all clients disconnected. With the --force option the "fast" mode is used which rolls back all active transactions, disconnects clients immediately and thus shuts down cleanly. If that does not work, shutdown is attempted again in "immediate" mode, which can leave the cluster in an inconsistent state and thus will lead to a recovery run at the next start. If this still does not help, the postmaster process is killed. Exits with 0 on success, with 2 if the server is not running, and with 1 on other failure conditions. This mode should only be used when the machine is about to be shut down. restart Stops the server if it is running and starts it (again). reload Causes the configuration files to be re-read without a full shutdown of the server. promote Commands a running standby server to exit recovery and begin read-write operations. OPTIONS
-o option Pass given option as command line option to the postmaster process. It is possible to specify -o multiple times. See postmaster(1) for a description of valid options. pg_ctl options Pass given pg_ctl options as command line options to pg_ctl. See pg_ctl(1) for a description of valid options. FILES
/etc/postgresql/cluster-version/cluster-name/pg_ctl.conf This configuration file contains cluster specific options to be passed to pg_ctl(1). SEE ALSO
pg_ctl(1), pg_wrapper(1), pg_lsclusters(1), postmaster(1) AUTHOR
Martin Pitt <mpitt@debian.org> Debian 2012-10-08 PG_CTLCLUSTER(8)
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