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10.20.2005 at 09:43AM PDT, ID: 21602004
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8.0

Oracle Locking Modes

Asked by Vikas_Dixit in Oracle Database

Tags: , ,

Experts,

Can some one tell me the definition and what types of statement will create locks in different modes i.e
0, 'None',
1, 'Null',
2, 'Row-S (SS)',
3, 'Row-X (SX)',
4, 'Share',
5, 'S/Row-X (SSX)',   ** Specially this one
6, 'Exclusive'

I have a scenario where i am facing blocking lock problem :

An user is modifying MY_TABLE fromFront end, and  FE holds lock in "Row-X (SX)" mode.  The FE has selected record using  "SELECT * FROM MY_TABLE WHERE KEY = :A1 FOR UPDATE NOWAIT "

Now in a different session Application Server trying to delete another record in the same table and Holds lock in "Row-X (SX)" mode  because of " SELECT ROWID FROM MY_TABLE WHERE KEY = :B1 FOR UPDATE "
and requeste S/Row-X (SSX), to Execute the statement "DELETE MY_TABLE WHERE ROWID = :B1"

Here's how the dba_dml_locks looks like :
SESSION_ID      NAME      MODE_HELD      MODE_REQUESTED      LAST_CONVERT
51      MY_TABLE      Row-X (SX)      S/Row-X (SSX)      3344
70      MY_TABLE      Row-X (SX)      None               3688

Now the FE Lock Becomes blocking. Any help in understanding this is much appreciated.

Regards,
Vikas Dixit
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Zone: Oracle Database
Tags: oracle, lock, modes
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Solution Provided By: schwertner
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Solution Grade: A
 
 
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