Обсуждение: Why create CHECKPOINT_WAIT checkpoint in pg_start_backup not CHECKPOINT_IMMEDIATE?

pg_start_backup is rather slow, can I change checkpoint to  CHECKPOINT_IMMEDIATE?

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Richard
2010-08-05

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