Lock objects are use in SAP to avoid the inconsistancy at the time of data is being insert/change into database.
SAP Provide three type of Lock objects.
SAP Provide three type of Lock objects.
· Read Lock(Shared Locked)
protects read access to an object. The read lock allows other transactions read access but not Write access to the locked area of the table
· Write Lock(exclusive lock)
protects Write Access to an object. The Write Lock allows other transactions neither read nor write access to the locked area of the table.
· Enhanced write lock (exclusive lock without cumulating)
works like a write lock except that the enhanced write lock also protects from further accesses from the same transaction.When you create a lock object System automatically creat two function module.
1. ENQUEUE_. to insert the object in a queue.
2. DEQUEUE_. To remove the object is being queued through above FM.
