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Unindexed FK Cause Deadlock or Only Share Lock?

Unindexed FK Cause Deadlock or Only Share Lock?

2005-06-30       - By Post, Ethan

Reply:     1     2     3     4     5     6     7     8     9     10     >>  

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@(protected)]
Sent: Thursday, June 30, 2005 1:39 PM
To: Post, Ethan; Oracle-L@(protected) 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@(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?
--
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