Hello, I experienced a similar issue with 8.2.x having a duplicate value in a primary key ! In our case it definitively happened as the plates got out of space, so I did put the fault on us, not on Postgres :-) regards, Marc Mamin -----Original Message----- From: pgsql-admin-owner@xxxxxxxxxxxxxx [mailto:pgsql-admin-owner@xxxxxxxxxxxxxx] On Behalf Of dinesh Sent: Monday, October 26, 2009 10:14 PM To: pgsql-admin@xxxxxxxxxxxxxx Subject: duplicate key violated errors Hi All: I have a table, which has over 3 million rows. We have both a unique constraint ( which creates implicit index) as well as a regular unique index on the same column. We had to put the unique constraint because duplicate values were getting inserted to the table in spite of the regular unique index on the column. In our applications we always check to make sure the existence of the value before we insert, in another word we do not insert if the value exist there already. Do you know of any known issues where postgres throws duplicate key violated error in a situation like mine where I have two indexes on the same column. I know it does sound redundant, but I am skeptical about changing this any other way since it is a production system. I did rebuilt the regular index but we still kept on getting the same error, so index corruption is out of question. We run postgresql 8.2.5 Thanks. Dinesh -- Sent via pgsql-admin mailing list (pgsql-admin@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-admin -- Sent via pgsql-admin mailing list (pgsql-admin@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-admin