Hardware and Operating System SAP R/3 Basis ... - SAP Techies

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Introduction To SAP R/3 Basis ----------------------------------------------------------- Locks in R/3 at the Business Process Level Compiled By: Ashwin Vavaiya 22 of 44
Introduction To SAP R/3 Basis ----------------------------------------------------------- Requesting a Lock From the Enqueue WP When a lock is requested, the system checks to determine whether the requested lock conflicts with any entries in the lock table. If there are conflicts, the lock request is rejected. The application program then informs the user that the operation cannot currently be executed. A message appears,for example, “Data is currently in use. Change not possible.” The locks (enqueues) are administered by the enqueue work process using the lock table. The lock table is stored in the main memory of the server where the enqueue work process is running. If the dialog work process and enqueue work process are not running on the same server, they communicate through the message server. Locks set by application programs are reset either by the application program itself or by a special update program (in the second part of SAP- LUW) Compiled By: Ashwin Vavaiya 23 of 44
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