Re: Why create CHECKPOINT_WAIT checkpoint in pg_start_backup not CHECKPOINT_IMMEDIATE? - Mailing list pgsql-general

From Greg Smith
Subject Re: Why create CHECKPOINT_WAIT checkpoint in pg_start_backup not CHECKPOINT_IMMEDIATE?
Date
Msg-id 4C5B147E.50708@2ndquadrant.com
Whole thread Raw
In response to Why create CHECKPOINT_WAIT checkpoint in pg_start_backup not CHECKPOINT_IMMEDIATE?  ("Richard" <husttripper@vip.sina.com>)
List pgsql-general
Richard wrote:
> pg_start_backup is rather slow, can I change checkpoint to  CHECKPOINT_IMMEDIATE?
>

Starting in PostgreSQL 8.4, pg_start_backup takes an optional second
parameter that asks it to do an immediate checkpoint if you set it
true:  http://www.postgresql.org/docs/8.4/interactive/functions-admin.html

In 8.3, it can be useful to execute a manual CHECKPOINT just before
running pg_start_backup instead, so that the checkpoint it does will
likely be smaller.

--
Greg Smith  2ndQuadrant US  Baltimore, MD
PostgreSQL Training, Services and Support
greg@2ndQuadrant.com   www.2ndQuadrant.us


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