About 5-10 million rows stay after deletion. There are a few other tables where the daily deletion totals about 3-6 million. Would a vacuum full/cluster affect other operations. These tables have a 24x7 high data insertion rate. -----Original Message----- From: Alvaro Herrera [mailto:alvherre@xxxxxxxxxxxxxxxxx] Sent: Wednesday, May 17, 2006 1:36 PM To: Sriram Dandapani Cc: pgsql-admin@xxxxxxxxxxxxxx Subject: Re: [ADMIN] autovacuum for large periodic deletes 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
