Jonathan,
Wouldn't PK/FK activity result in TM waits, rather than TX waits?
-----Original Message-----
From: oracle-l-bounce_at_freelists.org on behalf of Jonathan Lewis
Sent: Thu 5/27/2004 3:50 PM
To: oracle-l_at_freelists.org
Cc:
Subject: Re: TX locks
Other common causes of TX/4 waits on a TX/6
Bitmap indexes on OLTP tables - with updates to
the bitmapped column, or inserts/delete of rows.
Updates colliding on rows in IOTs.
Several variations of pk/fk activity split across
two sessions.
Regards
Jonathan Lewis
http://www.jlcomp.demon.co.uk
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- Original Message -----
From: "Adams, Matthew (GE Consumer & Industrial)" <MATT.ADAMS_at_GE.COM>
To: <oracle-l_at_freelists.org>
Sent: Thursday, May 27, 2004 7:45 PM
Subject: RE: TX locks
The blocker has the TX enqueue with lmode=3D6, the requestor=20
is requesting a shared lock (lmode=3D4). =20
I've narrowed the issue down to two the same two possibilities
you mentioned:
- The blocked transaction is attempting to insert the same PK/UK
values and is waiting to see if the first one commits or rolls back.
- Lack of an available ITL slot in either the table or index. =20
Since maxtrans is set to 255, I'm leaning away from this, although
I am aware of the fact that if there is not enough space in the block=20
to increase the ITL from the default of one, it will wait rather than
expand the ITL, eventually timing out with this 2049 error. I think it =
would
be happening a little less frequently if this were the problem.
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Received on Thu May 27 2004 - 16:58:38 CDT
