Hello guys!
Need your advice within my case.
In our project we were testing loading operation and used sp_sysmon for monitoring our performance.
Suddenly in ours logs(sysmon) we saw increase of parameter
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Log Semaphore Requests:
Waited
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this parameter increased to 35%.
We thought this is our problem and decided to use async log service in our database options for solving problem with high Waited
We set this option after we read a link
When we used it for testing environment it was OK, but when we started this option in real life it was prolonged ROLLBACK in case we got it.
Rollback of ours transaction took 1 hours and more.(before seting this option ROLLBACK was shorter) And all this time date in log segment increased.
In our stand we have 64 engine and 230Gb memory for sybase.
processors POWER 7+.
and productive disk subsystem
Does anybody know why there were problem with rollback transaction with this option and how it could be solved for high Waited?