2010/11/25 Bruce Momjian <bruce@momjian.us>:
> Document that a CHECKPOINT before taking a file system snapshot can
> reduce recovery time.
I didn't follow that on -hackers, but :
* checkpoint take place in the pg_start_backup process (before it
releases the hand, so before you can start snapshoting)
* we used to issue a checkpoint *before* pg_start_backup to reduce
pg_start_backup duration in case you have wal_archiving turn off and
full_page_write is off, it reduces a bit the IO contention. (or even
if not I hate seing this pg_start_backup taking seconds/minutes to
finish)
How the checkpoint before will reduce recovery time ?
>
> Branch
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> master
>
> Details
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> http://git.postgresql.org/gitweb?p=postgresql.git;a=commitdiff;h=7276ab5888d85782d988fc297ad2e176c7ad1bca
>
> Modified Files
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> doc/src/sgml/backup.sgml | 2 ++
> 1 files changed, 2 insertions(+), 0 deletions(-)
>
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Cédric Villemain 2ndQuadrant
http://2ndQuadrant.fr/ PostgreSQL : Expertise, Formation et Support