Yes, unindexed FKs can absolutely cause deadlocks. I recently had a problem with this happening frequently for an application called Khameleon. After adding FK indexes, the deadlocks vanished.
-- --Original Message-- -- From: oracle-l-bounce@(protected) [mailto:oracle-l-bounce@(protected)]On Behalf Of Post, Ethan Sent: Thursday, June 30, 2005 11:32 AM To: Oracle-L@(protected) Org (E-mail) Subject: Unindexed FK Cause Deadlock or Only Share Lock?
I am trying to find out if a missing index on a foreign key would cause a deadlock. I always thought is would only cause a share lock and hold up other DML, not deadlock it.
This asktom link http://tinyurl.com/djgco (search for deadlock and read comments/responses) seems to suggest you only get a share lock.
However I was sent these links also...some don't seem to support the idea of deadlocks but others do. Anyone know the answer here? Anyone think of a quick test case which demonstrates this?
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