Possible Causes:
It is typical
of Oracle Database background processes to wait for more work.
For example, (LGWR,DBWr,LMS0) will wait for more work until another (foreground or background ) process
request LGWR to do a log flush. In UNIX platforms, wait mechanism is
implemented as a sleep on a specific semaphore associated with that process.
This wait time is accounted towards database wait events ‘rdbms ipc message’. Also note that, semaphore based waits are used in other wait
scenarios too, not just ‘rdbms ipc message’ waits.
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