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RE: Deadlock Detection

From: Mohan, Ross <MohanR_at_STARS-SMI.com>
Date: Fri, 22 Jun 2001 09:41:09 -0700
Message-ID: <F001.00333DAA.20010622091147@fatcity.com>

wow. great post.

-----Original Message-----
Sent: Friday, June 22, 2001 11:50 AM
To: Multiple recipients of list ORACLE-L

Tom,

The information you need should be in the trace file, but it's not in the excerpt you've listed, but the true problem is listed:

> Rows waited on:
> Session 27: no row

"No row" indicates that the deadlock is due to a lack of available ITL slots in the datablock.

Unfortunately resolving this requires recreating the object with either a high initrans value (to explicitly reserve space for more ITL slots) or a higher pctfree value (to give the ITL table more room to grow).

Depending on the application it could also be that multiple sessions are acquiring the same block off the free list so using multiple free lists could also help. Starting with 8.1.6 this setting can be changed dynamically; prior to that you must recreate the object.

Note: 62365.1 also has some good info

HTH,


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Received on Fri Jun 22 2001 - 11:41:09 CDT

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