Re: Lock
- From: "Jonathan Lewis" <jonathan@xxxxxxxxxxxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Mon, 12 Mar 2012 12:35:42 -0000
Ambiguous question, really.
Each row will have its lock byte set.
Each table block involved will have one ITL entry used to identify the
locking transaction
There will be a TM lock (mode 3, id1 = table's object_id) displayed in
v$lock to show that there is an active transaction modifying the table.
There will be a TX lock displayed in v$lock which will report the
transaction table entry from the undo segment header being used by the
transaction
Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com
Oracle Core (Apress 2011)
http://www.apress.com/9781430239543
----- Original Message -----
From: "Paul Harrison" <cure@xxxxxxxxxxxxx>
To: <oracle-l@xxxxxxxxxxxxx>
Sent: Saturday, March 10, 2012 4:56 PM
Subject: Lock
Hello,
I have a table with four rows. I issue the sql statement: update table set
name = 'test'; this will update 4 rows. Will Oracle create 4 locks one for
each row or 1 lock for the 4 rows?
Thanks,
Paul
--
//www.freelists.org/webpage/oracle-l
-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2012.0.1913 / Virus Database: 2114/4861 - Release Date: 03/09/12
--
//www.freelists.org/webpage/oracle-l
Other related posts:
