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Home -> Community -> Mailing Lists -> Oracle-L -> insert performance
Greetings!
I am trying to diagnose a performance difference between two databases
running the same test. They are similarly configured (same SGA size,
etc.), and the servers are identical except for the number of CPUs
(server A has 4, server B has 6).
On database A, INSERT performance is about 190 rows/second.
On database B, INSERT performance is over 500 rows/second.
I saw some cache buffers chains, buffer busy, and library cache latch waits on database A while the test was running, as well as redo log sync waits. The waits didn't seem excessive, though. I checked for "checkpoint not complete" redo allocation messages in database A's alert log and found none. The db_block_lru_latches parameter is set to one-half the number of CPUs in both machines.
I'd much appreciate any suggestions as to what else to check. I know that freelists can be an issue (there are multiple sessions performing inserts); how can I check to see if there's freelist contention? Anything else I should investigate?
Many TIA,
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