Tuesday, January 7, 2014

Enqueue server (E)

SAP BASIS FAQ'S

 Enqueue server (E)

 

A.   Enqueue server handles by the locking and unlocking mechanism
B.   The Enqueue server parameter name is – rdisp\wp_no_enq
C.   Enqueue server table size is minimum of 4MB
D.  We can increase the maximum of size is 100MB
E.   Enqueue table size is enq\table_size=4mb to 100mb
F.   Enqueue server log files will be stored in O.S level Usr\sap\<Sid>instance<number>\log
G.  The Enqueue server work process administrators a lock table in the shared memory area
H.  Enqueue server 4 types they are

1) Shared locks: one user can read the tables and another one user can write the tables
2) Exclusive locks: only a particular user can read it, nobody else can access it
3) Cumulative locks: The same user with different transaction accessing the same table then the lock will be shared with user transactions
4) Optimistic locks: One user lock the table and another user doesn’t have read & access the table permission
I.   Select lock entries – SM12
You can check (or) released the locked entries using transaction is sm12.
If there is a sudden power failure. Some of the users update entry might still be locked. If possible asked the user to logoff first, before deleting the lock entries
J.  Transaction codes: locks and unlocks – SM01
K. Enqueue server lock tables are stored in TLOCK

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