| From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
|---|---|
| To: | Sriram Dandapani <sdandapani(at)counterpane(dot)com> |
| Cc: | pgsql-admin(at)postgresql(dot)org |
| Subject: | Re: autovacuum for large periodic deletes |
| Date: | 2006-05-17 20:36:21 |
| Message-ID: | 20060517203621.GR26367@surnet.cl |
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| Thread: | |
| Lists: | pgsql-admin |
Sriram Dandapani wrote:
> Every night, a delete of about 50 million rows occurs on a table. Do we
> need to explicitly vacuum the table or will autovacuum handle the large
> deletes without affecting performance. I am trying to determine whether
> or not I should completely rely on autovacuum or also tinker with manual
> vacuums.
How many rows stay in the table after the massive deletion? It may be
that it's best for you to issue a CLUSTER or VACUUM FULL instead of
VACUUM. (In any case, autovacuum would vacuum the table eventually, but
maybe you can do better.)
--
Alvaro Herrera http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support
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