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Can `where' clause be used when updating database entries? Ans :- Yes. Describe array operations and their advantages? Ans :- What is logical unit of work? How is it defined? Ans :- Logical Unit of work is a block of memory area where database contents are stored and manipulated. For every SAP application LUW is automatically created for database communication. Besides this we have SAP LUW s also there. What function is performed by the commit work command? Ans :- When you perform Commit , all the LUW s work will be reflected to the database. Why is it so important for a programmer to check the lock entries? Ans :- To find out if record is locked and also to maintain data integrity. How can you find a lock entry for a database table? Ans :- The function module `ENQUEUE <lock object>' checks whether a lock was triggered for the same object. Otherwise an exception FOREIGN_LOCK is carried out. If the object is not locked the function module sets the lock. What steps are necessary to set a lock on a record within a database table? Ans :- Execute CALL FUNCTION statement CALL FUNCTION "ENQUEUE <lock object'> EXPORTING... EXCEPTIONS... CASE SY-SUBRC. . . ENDCASE. How do you unlock the entry? Why is this necessary? Ans :- Execute the CALL FUNCTION statement CALL FUNCTION `DEQUEUE <lock object>' EXPORTING... It is important to unlock the entry so others can update it. What is the difference between `CALL SCREEN # # # ` and `SET SCREEN ### ' ... LEAVE SCREEN? Ans :- SET SCRREN statement sets or overwrites the follow-up screen. LEAVE SCREEN executes the screen number currently in the follow-screen field CALL SCREEN interrupts the processing of the current screen to call a new screen or a chain of screens, processing of the current screen is resumed directly after the call.