Re: Lock

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



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