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Home -> Community -> Mailing Lists -> Oracle-L -> Re: Querying v$ tables very slow after upgrade
Thanks to all of you that responded.
I had to open a SEV 1 SR with Oracle because my slow querying of v$ tables snowballed into a total system meltdown.
The root cause was a blocking mutex latch in our newly upgraded production database. Oracle support determined that the latching issue was due to a high rate of hard parsing and low percentage of shared SQL.
I turned off mutex locking with an Oracle-supplied hidden parameter, added cursor_sharing=similar and increased session_cached_cursors.
I also found 2 offending SQL statements from our web apps that were doing a ton of LIOs and chewing up CPU and fixed them.
Today everything is stable and happy.
There is nothing like an Oracle upgrade to get your adrenalin flowing on a Monday morning!
Patty
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-- http://www.freelists.org/webpage/oracle-lReceived on Tue Jun 26 2007 - 11:55:23 CDT
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