Re: ORA-600 Deadlock Issues
- From: "Radoulov, Dimitre" <cichomitiko@xxxxxxxxx>
- To: <karthik@xxxxxxxxx>, <oracle-l@xxxxxxxxxxxxx>
- Date: Mon, 27 Jun 2005 10:19:26 +0200
look up chapter 7 of tom kytes' book - Indexes on Foreign Keys. (page 142
in my book).
"The number one cause of deadlocks in the Oracle database, in my
experience, is unindexed foreign keys" - says the Guru himself.
The next time you have a deadlock, check first the deadlock graph, for
unindexed foregn keys it will be SX-SSX:
Deadlock graph:
---------Blocker(s)-------- ---------Waiter(s)---------
Resource Name process session holds waits process session holds
waits
TM-000010e0-00000000 14 40 SX SSX 13 19 SX
SSX
TM-000010e0-00000000 13 19 SX SSX 14 40 SX
SSX
session 40: DID 0001-000E-00000002 session 19: DID 0001-000D-00000002
session 19: DID 0001-000D-00000002 session 40: DID 0001-000E-00000002
Cheers
Dimitre Radoulov
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