A lock is a software mechanism that you can set to prevent others from using a resource. You can place a lock on a single row or key, a page of data or index keys, a whole table, or an entire database.

Additional types of locks are available for smart large objects. For more information, see Locks for smart large objects.

The maximum number of rows or pages locked in a single transaction is controlled by the total number of locks configured. The number of tables in which those rows or pages are locked is not explicitly controlled.

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