Question

How to lock a table using T SQL in Sql Server?

Asked by: jfz2004

I have the following I copied from some where:

    BEGIN TRANSACTION
    lock table ABC in exclusive mode
    .... ....
    COMMIT TRANSACTION

But it is not working. It keps saying:
Incorrect syntax near 'ABC'.

What's wrong here?

Thanks  for any help.

Jennifer

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Asked On
2006-08-21 at 11:12:06ID21961915
Tags

lock

,

table

Topic

Databases Miscellaneous

Participating Experts
2
Points
100
Comments
9

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Answers

 

by: tncbbthositgPosted on 2006-08-21 at 11:38:41ID: 17358091

try WITH TABLOCK in your from clause.

i.e., SELECT * FROM myTable WITH TABLOCK.



TNC

 

by: itdrmsPosted on 2006-08-21 at 11:39:48ID: 17358106

Is it maybe just a comment? -- what is the next line

If its' something like
SELECT * FROM abc WITH (HOLDLOCK)

then just add the comment "--" before the line you displayed

 

by: tncbbthositgPosted on 2006-08-21 at 11:54:58ID: 17358222

I take that back:

try WITH TABLOCK in your from clause.

i.e., SELECT * FROM myTable WITH (TABLOCKX)



TNC

 

by: jfz2004Posted on 2006-08-21 at 12:08:16ID: 17358331

I know how to do it now:

    SET TRANSACTION ISOLATION LEVEL SERIALIZABLE

 

by: jfz2004Posted on 2006-08-21 at 12:24:13ID: 17358468

But I still want to ask.

I have teo transactions, will
SET TRANSACTION ISOLATION LEVEL SERIALIZABLE
affect both?

My code looks like:

SET TRANSACTION ISOLATION LEVEL SERIALIZABLE
BEGIN TRANSACTION
....
END TRANSACTION

BEGIN TRANSACTION
....
END TRANSACTION

Will "SET TRANSACTION" affect both transactions or just the first one?

Thanks,

Jennifer

 

by: tncbbthositgPosted on 2006-08-21 at 14:05:39ID: 17359278

Jennifer, I'm not sure that's what you want to do.  Yes, it will affect both transactions.  Actually, it'll affect all transactions issued by that connection.  The problem is, you'll lock every table involved with every select statement in the transaction.  If you're updating or inserting and trying to lock the table from reads during those operations, SET TRANSACTION ISLATION LEVEL won't even help at all.  If all you want to do is ensure that you're not getting a dirty read, then you only nead SET TRANSACTION ISOLATION LEVEL READ COMMITTED.

Either way, you're better off specifying the minimum required lock on a per table basis.

Just a thought,
TNC

 

by: jfz2004Posted on 2006-08-22 at 08:05:45ID: 17364410

Thanks a lot for your help.

What I want to do is that I want to lock the first transaction only.
In my first transaction, I have a select and then an insert to the same table. I don't want anyone to touch this table within the first transaction. And I don't want to apply any lock on the 2nd transaction.

How should I do that?

Thanks again,

Jennifer

 

by: jfz2004Posted on 2006-08-22 at 10:13:57ID: 17365636

Any new ideas?

 

by: tncbbthositgPosted on 2006-08-22 at 13:10:12ID: 17367058

Jennifer,

      Your select will look much like this:
     SELECT * FROM myTable WITH (TABLOCKX)

     Then, your insert should look like this:
     INSERT INTO myTable WITH (TABLOCKX) (...) VALUES (...)

TNC

20120131-EE-VQP-002

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