RE: Unindexed FK Cause Deadlock or Only Share Lock?
- From: "Reidy, Ron" <Ron.Reidy@xxxxxxxxxxxxxxxxxx>
- To: <Ethan.Post@xxxxxx>, "Allen, Brandon" <Brandon.Allen@xxxxxxxxxxx>, "Oracle-L@Freelists. Org (E-mail)" <oracle-l@xxxxxxxxxxxxx>
- Date: Thu, 30 Jun 2005 12:58:06 -0600
http://www.zanthan.com/itymbi/archives/001548.html
-----------------
Ron Reidy
Lead DBA
Array BioPharma, Inc.
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx]On Behalf Of Post, Ethan
Sent: Thursday, June 30, 2005 12:41 PM
To: Allen, Brandon; Oracle-L@Freelists. Org (E-mail)
Subject: RE: Unindexed FK Cause Deadlock or Only Share Lock?
Forgot to add, does the cardinality of the column matter, what if the
only possible values are "Y" and "N", what if 99.9% of the rows are all
"Y"? Does the index still prevent a deadlock?
What are the internals on this, anyone know?
-----Original Message-----
From: Allen, Brandon [mailto:Brandon.Allen@xxxxxxxxxxx]
Sent: Thursday, June 30, 2005 1:39 PM
To: Post, Ethan; Oracle-L@Freelists. Org (E-mail)
Subject: RE: Unindexed FK Cause Deadlock or Only Share Lock?
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@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx]On Behalf Of Post, Ethan
Sent: Thursday, June 30, 2005 11:32 AM
To: Oracle-L@Freelists. Org (E-mail)
Subject: Unindexed FK Cause Deadlock or Only Share Lock?
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