Undo Segment in RAC Database
My RAC DB (HPUX server) user connection happen to be very slow this morning. Nothing was recording in the alert log. But the connection become normal after the undo segment 21 onlined. Could anyone tell me was exactly the database do when its bring the undo segment online?
Please advise. Appreciate for your input. Thanks.
It is hard to diag your slowdown just according to your words.
Maybe the one more undo segment really helps, maybe the rac is good when it online that one more undo segment.
Next time you hit slowdonw, you can try to check v$session_wait and both node's alert file , or use statspack to help to diag your slowdown.
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