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Oracle Metric rdbms ipc reply

Oracle Consulting Tips by Burleson

 

The rdbms ipc reply Oracle metric event is used to wait for a reply from one of the background processes.

Steve Adams notes on "rdbms ipc reply":

"Your write complete waits and rdbms ipc reply waits indicate the either DBWn's write batch is too big, or you are checkpointing too intensively. Make sure that db_files is not much higher than the number of datafiles that you actually have. If you are using incremental checkpoints ( db_block_max_dirty_target) don't be too ambitious."

 

On Oracle MOSC Forums, a user was having trouble with a slow database, and was concerned with the rdbms ipc reply was the highest wait event.  A replier helped resolve the issue by infroming the user that they should:

1. Make sure your parfile has the line COMMIT=N
Otherwise, Oracle will perform a commit after each row is inserted, and that may be the cause of your problems.
2. Enlarge the size of your redo till you are only performing 1 log switch every 10-20 minutes.
3. 'RDBMS IPC REPLY' is shared memory segments passing messages (usually flags) back and forth. This is nothing to get worried about, and most people consider it to be an idle wait event.
4. Run a statspak report for 15 minutes during the import, and that will show where your problems really are, like hot blocks etc.


 

 
This, and many other Oracle performance metrics are discussed in my book "Oracle Tuning" by Rampant TechPress.  You can buy it directly from the publisher and save 30% at this link:

http://www.rampant-books.com/book_1002_oracle_tuning_definitive_reference_2nd_ed.htm


 

 

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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

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