Ah, the table modification is really not possible at this stage due to multiple teams using it and multiple levels of approval required. I need a quick-fix.
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Lock table command in SQL Express 2005
Hi,
We have a stored-procedure on SQL Express 2005 which uses BCP to back-up the data from a table into a CSV file, and then deletes the data from the table. This is done in 2 lines:
EXEC xp_cmdshell 'BCP command to back up'
DELETE FROM TABLE_NAME
The issue is that if there is a single insert done to the table when the execution of the first statement has just finished but the second statement has not yet executed, then we might miss backing up that record in the file, and it would get deleted.
To resolve this in the most simple and effort-less manner, is there a simple lock table command which allows me to lock the table before the execution of the first statement, and then I can release the lock after the second statement finishes execution?
Thanks,
Mayank.
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Answers
Then you have to use the table hint TABLOCKX like
SELECT * FROM TABLE (TABLOCKX)
DELETE FROM TABLE (TABLOCKX)
But make sure that both are within the same transaction as this will be applied to the same transaction.
If you lock the table using first statement in another transaction, then you wont be able to do the DELETE from second statement.
Hope this helps.
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by: rrjegan17Posted on 2009-06-14 at 07:42:15ID: 24623628
This issue needs to be solved using other Logics and Not Lock Logic.
1. Add another column in that table named Status.
2. Before executing the First command, Update all records with Status as 'Y' to indicate that those are the records to be backed up.
3. Backup Records with Status as 'Y'.
4. Delete records with Status as 'Y'.
Since new records inserted would be having Null Values, you wont be deleting out that record, and hope this solves your requirement.