RE: Block dump - Uncommitted TXN - Help Urgent
- From: "Bobak, Mark" <Mark.Bobak@xxxxxxxxxxxxxxx>
- To: <bnsarma@xxxxxxxxx>, "goran bogdanovic" <goran00@xxxxxxxxx>
- Date: Wed, 20 Sep 2006 12:13:30 -0400
Note that if you see a TX enqueue waiting on mode 4, that's not
necessarily ITL slot shortage. If the waiting statement is an INSERT
and the object is a heap table, then it's definitely not ITL shortage.
(If there's ITL shortage on a table block, INSERT will go to another
block on the free list, if it's on the index, INSERT will do a block
split.)
The other cause TX enqueue mode 4 waits is concurrent inserts colliding
on a unique index, PK, or UK. (i.e. session 1 inserts key value 1,
session 2 inserts value 2, session 1 attempts to insert value 2, session
2 attempts to insert value 1)
Hope that helps,
-Mark
--
Mark J. Bobak
Senior Oracle Architect
ProQuest Information & Learning
"A human being should be able to change a diaper, plan an invasion,
butcher a hog, conn a ship, design a building, write a sonnet, balance
accounts, build a wall, set a bone, comfort the dying, take orders, give
orders, cooperate, act alone, solve equations, analyze a new problem,
pitch manure, program a computer, cook a tasty meal, fight efficiently,
die gallantly. Specialization is for insects." --Robert A. Heinlein
________________________________
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of BN
Sent: Wednesday, September 20, 2006 10:15 AM
To: goran bogdanovic
Cc: oracle-l@xxxxxxxxxxxxx
Subject: Re: Block dump - Uncommitted TXN - Help Urgent
On 9/20/06, goran bogdanovic <goran00@xxxxxxxxx> wrote:
Hi,
The inittrans should correspond to your max active concurrent
dml sessions on that table
goran
On 9/20/06, BN < bnsarma@xxxxxxxxx <mailto:bnsarma@xxxxxxxxx> >
wrote:
On 9/19/06, Christian Antognini <
Christian.Antognini@xxxxxxxxxxxx
<mailto:Christian.Antognini@xxxxxxxxxxxx> > wrote:
> I was thinking of INITRANS , is there a way to
track that from
> v$lock,
> I remember once Steve Adams answering some
body looking at v$lock
> looking at Request Column, not sure though
Hi
Here an example of sessions waiting for a
transaction slot:
SQL> SELECT event FROM v$session_wait WHERE sid
= 12;
EVENT
-----------
enqueue
SQL> SELECT type, id1, id2, lmode, request FROM
v$lock WHERE sid = 12;
TY ID1 ID2 LMODE REQUEST
-- ---------- ---------- ---------- ----------
TM 34522 0 3 0
TX 393247 9877 0 4
As you can see the request mode is S (4).
HTH
Chris
--
//www.freelists.org/webpage/oracle-l
Greetings,
Yes I saw Request=4 for quite a few sessions. I ahve
Identified the Tables that needs INITRANS Bump. Is there a way to
figureout how much should I bump for each table in question
--
Regards & Thanks
BN
Greetings
Yes, I understand, is there a view in the Datadictionary to check how
much each table has reached, other than tracking/sampling v$lock or
v$transaction
--
Regards & Thanks
BN
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