Question

How to Lock a table or record in the Oracle using query

Asked by: vvs

Hi friends
 I want to lock the table using the query in oracle so can any body tell how I will do the same  I know  how to lock the table in SQLServer  as

begin transaction
update <table> set <field>=<value> where <condition>
 
This will lock the table. You can open another query analyzer window/session in sqlserver, and run a select * from <table>, it will block.

the same thing i want to do in oracle so can anybody tell me how I can do this in oracle



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Asked On
2005-04-15 at 02:08:08ID21389969
Tags

oracle

,

record

,

lock

Topic

Databases Miscellaneous

Participating Experts
4
Points
50
Comments
7

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Answers

 

by: HenkaPosted on 2005-04-15 at 02:49:50ID: 13789251

The Oracle locking mechanism is different from SQL Server one. You can read this documentation - the registration is free:
http://download-west.oracle.com/docs/cd/B10501_01/appdev.920/a96590/adg08sql.htm#8123

 

by: ploubierPosted on 2005-04-15 at 02:52:48ID: 13789267

You can use SELECT FOR UPDATE

 

by: sujit_kumarPosted on 2005-04-15 at 05:01:23ID: 13789877

like "select * from emp where deptno = 20 for update; " will lock all the rows with DEPTNO=20. This lock can be released by either issuing a COMMIT or ROLLBACK. You can also use "for update of ename" or "for update NOWAIT". Issue the lock before using UPDATE/DELETE statement.

 

by: jrb1Posted on 2005-04-15 at 13:37:13ID: 13794337

I don't believe there is any way to get Oracle to do that.  The approrpiate way to lock would be

lock table {table_name} in exclusive mode;

However, this will only prevent changes...a query against the table is still possible.  Oracle ensures consistent reads, and doesn't prevent locks from giving you a consistent view to the data.

 

by: vvsPosted on 2005-04-20 at 04:25:56ID: 13823177

ya I am accepting the answer here for Oracle can any one tell me the sme for Db2
I mean how I can lock the table in db2

20120131-EE-VQP-002

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