Is streams enabled by default in 10g?

I am seeing very high average waits for this event in v$system_event:
Streams AQ: waitin
EVENT     TOTAL_WAITS     TOTAL_TIMEOUTS     TIME_WAITED     AVERAGE_WAIT
Streams AQ: waiting for time management or cleanup tasks     162     162     35531941     219332.97
Streams AQ: qmn slave idle wait     24896     0     67945137     2729.16
Streams AQ: qmn coordinator idle wait     50030     25134     67952744     1358.24
Streams AQ: qmn coordinator waiting for slave to start     2     0     2     0.95
g for time management or cleanup tasks
We are not using steams at all. Is this is a problem event? Can I disable streams?
Thank You

Hello
From 10g onwards, Oracle AQ is called as Streams AQ, hence these wait events you are seeing is part of Oracle AQ itslef. You dont necessarily be using Oracle Streams for these wait events to appear.
Most of these wait events are idle. Even if you dont use Advanced Queuing, still you would see those since the system uses AQ feature for different purposes internally (like datapump, EM Alerts etc).
There are no options to disable these since the AQ (Streams AQ) is a built in feature. These should not be the waits which actually slows down or these should not indicate that you have a performance problem with the system.
I believe there are couple of bugs, related to high CPU by QMN (Queue Monitor)processes, if you see any of those, please log a TAR with Oracle Support.
Hope this helps, let us know if you have more questions.
Thanks,
Rijesh

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