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
