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,

• Anita
  • "Mercadante, Thomas F" <NDATFM_at_labor.state.ny.us> wrote:
    > All,
    >
    > My current application (still under development) is
    > experiencing Oracle
    > deadlock problems. The applications people are
    > performing stress testing
    > where the application is being repeatedly called
    > simulating actual users
    > hitting the database.
    >
    > The application is written using VB thru ADO and
    > COM, Oracle 816 on NT.
    >
    > My problem is that, while I can review the trace
    > file produced, I can't
    > figure out what the actual deadlock is occurring on.
    > I have seen deadlock
    > trace files that clearly state "table blah", but in
    > this case, I get:
    >
    >
    > *** 2001-06-21 14:32:03.841
    > *** SESSION ID:(27.31211) 2001-06-21 14:32:03.810
    > DEADLOCK DETECTED
    > Deadlock graph:
    > ---------Blocker(s)--------
    > ---------Waiter(s)---------
    > Resource Name process session holds waits
    > process session holds
    > waits
    > DX-0000003b-00000000 22 18 X
    > 24 27
    > X
    > session 18: DID 0001-0018-0000003C session 27: DID
    > 0001-0018-0000003C
    > Rows waited on:
    > Session 27: no row
    > *** 2001-06-21 14:32:03.857
    > ksedmp: internal or fatal error
    > ORA-00060: deadlock detected while waiting for
    > resource
    >
    > Is there something like TKPROF that will process the
    > trace file and give me
    > more info on what is happening? It looks like I am
    > waiting for a resource
    > to be freed, but which one is the question.
    >
    > thanks for any help.
    >
    > Tom Mercadante
    > Oracle Certified Professional
    >
    > --
    > Please see the official ORACLE-L FAQ:
    > http://www.orafaq.com
    > --
    > Author: Mercadante, Thomas F
    > INET: NDATFM_at_labor.state.ny.us
    >
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  INET: MohanR_at_STARS-SMI.com

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