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Re: Set maintenance work mem for pg_restore

From: Alvaro Herrera <alvherre(at)commandprompt(dot)com>
To: Deron <fecastle(at)gmail(dot)com>
Cc: pgsql-admin(at)postgresql(dot)org
Subject: Re: Set maintenance work mem for pg_restore
Date: 2007-12-18 20:49:57
Message-ID: 20071218204957.GE8088@alvh.no-ip.org (view raw or flat)
Thread:
Lists: pgsql-admin
Deron escribió:
> I see a lot of suggestions to increase maintenance work mem if running
> pg_restore.  This is to help with the index creation and initial sort from
> what I understand.  A few tests I ran does show this helps.
> Does anyone know if there is a way to only "temporarily" set this setting?
> I have some DBs that are bloated and I have a script to run off hours (I
> don't like working late).  This uses pg_dump and pg_restore to recover the
> disk space.  I found that this is usually faster than 'vacuum full', and is
> useful in some cases.

You can specify it via PGOPTIONS:

$ PGOPTIONS='-c maintenance_work_mem=1GB' psql
Welcome to psql 8.2.5, the PostgreSQL interactive terminal.

Type:  \copyright for distribution terms
       \h for help with SQL commands
       \? for help with psql commands
       \g or terminate with semicolon to execute query
       \q to quit

alvherre=# show maintenance_work_mem ;
 maintenance_work_mem 
----------------------
 1GB
(1 row)

alvherre=# \q

$ psql
Welcome to psql 8.2.5, the PostgreSQL interactive terminal.

Type:  \copyright for distribution terms
       \h for help with SQL commands
       \? for help with psql commands
       \g or terminate with semicolon to execute query
       \q to quit

alvherre=# show maintenance_work_mem ;
 maintenance_work_mem 
----------------------
 16MB
(1 row)



-- 
Alvaro Herrera                                http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support

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