Error 1204

Severity Level 19

Message Text

SQL Server has run out of LOCKS. Rerun your statement when there are fewer active users, or ask the system administrator to reconfigure SQL Server with more LOCKS.

Explanation

This error occurs when there are not enough system locks to complete the current command.

Action

Either execute the command again, when activity on the server is low, or have the system administrator increase the number of locks by executing sp_configure from the master database.

To view the current configuration:

sp_configure locks

GO

This reports the minimum, maximum, current run, and configuration values. To increase the number of locks, run sp_configure again, specifying the number of locks to be configured. For example, to configure 10,000 locks:

sp_configure locks, 10000

GO

RECONFIGURE WITH OVERRIDE

GO

Stop and restart Microsoft® SQL Server™ so the changes can take effect. Locks are allocated at system startup.

If the number of locks cannot be increased at the current time, and the single action requires more locks than the server is currently configured for, you may be able to reduce the number of locks required for the operation. For example, try the following:

• For large UPDATE statements, break the updates into smaller units that will affect only a subset of records at a time. For example, you could use the primary key, changing the single UPDATE statement from:

  UPDATE employees

  SET salary = salary * 1.05

  WHERE employee_id BETWEEN 1000 AND 9999

  GO

    

to several UPDATE statements:

UPDATE employees

SET salary = salary * 1.05

WHERE employee_id BETWEEN 1000 AND 4999

GO

UPDATE employees

SET salary = salary * 1.05

WHERE employee_id BETWEEN 5000 AND 9999

GO

• For a maintenance type of task or for a global update, consider putting the database into single-user mode (if it is feasible to keep other users out of the database). Single-user mode does not set locks, so you will not run out of locks, and the operation will run somewhat faster (because you save the locking overhead).
• For a large bcp operation, the entire operation is treated as a single transaction. When you use the batch parameter (-b), bcp will treat the operation in small transactions with the number of rows specified. At the end of each small transaction, the system resources held by that transaction are freed, so fewer locks are needed.

See Also