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тАО03-30-2007 09:32 AM
тАО03-30-2007 09:32 AM
Under the title "B.1 HP-UX Shared Memory Segments for an Oracle Instance" one can find that PA-RISC architecture has 6 unique protection keys for its shared memory segments and if the number of shared segments crosses 6, HP-UX displays protection key faults. In my system `ipcs -m` shows 20+ shared segments and my DBA is concerned over the performance degradation. Given that shmmax can be increased, can someone tell me where exactly "protection key faults" are logged? I checked in `dmesg` and syslog, but it's not there.
Solved! Go to Solution.
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тАО03-30-2007 09:58 AM
тАО03-30-2007 09:58 AM
SolutionThe good news is that the fix is trivially simple; set shmmax so that your largest anticipated SGA will fit in one segment. Otherwise, when a large SGA is used (ie larger than shmmax) multiple shmgets are used to create the SGA which results in multiple segments being assigned to the SGA -- and according to your reference anything over 6 triggers the extra lookups --- so set shmmax large and then you can forget about this.
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тАО03-30-2007 12:13 PM
тАО03-30-2007 12:13 PM
Re: Protection Key Faults on PA-RISC System
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тАО04-01-2007 02:49 PM
тАО04-01-2007 02:49 PM
Re: Protection Key Faults on PA-RISC System
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тАО04-02-2007 10:21 AM
тАО04-02-2007 10:21 AM