Problem with enq:SQ contention

here the problem is more contention with as i shown belo
enq: SQ - contention 168,888 234,204 1387 30.4
can u help on this

Hi Mohamed,
I've seen SQ enquque waits in busy databases with a large number of competing transactions are inserting rows. Also, look for related buffer busy waits, indicating a freelist shortage.
You can easily cache as sequence with the "add/alter sequence xxx cache" command. The "cache" clause caches the specified number of sequence values into the buffers in the SGA. This speeds access, but all cached numbers are lost when the database is shut down. The default value is 20; maximum value is maxvalue-minvalue.
If there are performance problems due to sequence cache waits, examine the row cache locks statistics in the v$system_eventview to determine whether the problem is due to the use of Oracle sequences.
If this is a RAC database, you should use the NOORDER keyword to avoid an additional cause of SQ enqueue contention that is forced ordering of queued sequence values.
Here are my notes:
http://www.dba-oracle.com/t_sequence_caching.htm
Hope this helps . . .
Donald K. Burleson
Oracle Press author

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