TAILIEUCHUNG - Avoiding Locking Scenarios

Avoiding Locking Scenarios • Best Practices – Application – Use least restrictive isolation level that maintains the data integrity requirements of the application – Reduce Isolation level of specific statements by using statement level isolation (., WITH clause) – CLOSE cursors WITH RELEASE to free locks prior to end of transaction – Perform updates as close to the end of the transaction as possible, to reduce exclusive lock duration – COMMIT frequently to release locks – Avoid multiple applications accessing the same tables, but acquiring locks in different orders (Access patterns should be similar) – Avoid having multiple processes that access the same. | Avoiding Locking Scenarios Best Practices - Application - Use least restrictive isolation level that maintains the data integrity requirements of the application - Reduce Isolation level of specific statements by using statement level isolation . WITH clause - CLOSE cursors WITH RELEASE to free locks prior to end of transaction - Perform updates as close to the end of the transaction as possible to reduce exclusive lock duration - COMMIT frequently to release locks - Avoid multiple applications accessing the same tables but acquiring locks in different orders Access patterns should be similar - Avoid having multiple processes that access the same table for both reads and writes within the same transaction Avoiding Locking Scenarios Best Practices - Database -Avoid lock escalations by increasing DB CFG parameters LOCKLIST and or MAXLOCKS - Avoid lock timeouts Adjust the DB CFG parameter LOCKTIMEOUT or use the SET CURRENT LOCK TIMEOUT command -Avoid deadlocks Reduce row blocking during index and table scans - DB2_SKIPINSERTED to skip ignore uncommitted inserted rows - DB2_SKIPDELETED to skip ignore uncommitted deleted rows - DB2_EVALUNCOMMITTED to defer locking until row is known to satisfy query. Uncommitted data will be evaluated. Skips deleted rows on table scans. More Useful Registry Variables for Locking DB2_KEEPTABLELOCK - allows DB2 to maintain the table lock when an uncommitted read or cursor stability isolation level is closed. The table lock is released at the end of the transaction DB2_MAX_NON_TABLE_LOCKS - defines the maximum number of NON table locks a transaction can have before it releases these locks. Because transactions often access the same table more than once retaining locks and changing their state to NON can improve performance DB2LOCK_TO_RB - specifies whether lock timeouts cause the entire transaction to be rolled back or only the current .

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