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Using rowlock & xlock

Author

Topic

kensai
Posting Yak Master

172 Posts

Posted - 2011-02-02 : 10:07:26

I have a simple job which selects records, inserts them into another table and deletes them from the original table. I want the records to be locked even for reading so I used rowlock and xlock as table hints while selecting them. The thing is I can select said records while the transactions is working. Here's my code:


set transaction isolation level repeatable read;
go

begin try	
	begin transaction;
	
	insert into myTable2
		select * from myTable1 with(rowlock, xlock)
		where status = 1;
	waitfor delay '00:02:00';
	delete from myTable1 where id in(
		select id from myTable1 with(rowlock, xlock)
		where status = 1
	);
	
	commit transaction;
end try
begin catch
	if xact_state() <> 0
	begin
		rollback transaction;
	end
end catch;

While the transaction is waiting on WAITFOR line, I can still select the records in another connection. What am I doing wrong?

Lamprey
Master Smack Fu Yak Hacker

4614 Posts

Posted - 2011-02-02 : 11:58:32

I'm not sure why you would want to block a read on your table. But you could use the TABLOCKX query hint.

Lamprey
Master Smack Fu Yak Hacker

4614 Posts

Posted - 2011-02-02 : 12:02:16

I'm not 100% sure what you are trying to do, but another option might be to DELETE the records first and use an OUTPUT clause to do the insert into Table2.

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