Answer / syed

Hi

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.
- 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.

You can create a lock on a object of SAP thorugh
transaction SE11 and enter any meaningful name start with
EZ Example EZTEST_LOCK.

Use: you can see in almost all transaction when you are
open an object in Change mode SAP could not allow to any
other user to open the same object in change mode.

Example: in HR when we are enter a personal number in
master data maintainance screen SAP can't allow to any
other user to use same personal number for changes.

Technicaly:
When you create a lock object System automatically creat
two function module.
1. ENQUEUE_<Lockobject name>. to insert the object in a
queue.
2. DEQUEUE_<Lockobject name>. To remove the object is being
queued through above FM.

You have to use these function module in your program

Answer / muralikrishna

IT IS USED TO SYNCHRONOUS ACCESS OF SEVERAL USERS USING SAME
DATA

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