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see ORA-12699
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Re: what is the process queue reference latch?

Tony van Lingen

2006-12-03

Replies:
Yes, except that this is version 10.1.0.4 and that bug was fixed in
10.1.0.3. The logs don't show that ora-600 error that precedes the
looping of PMON either..

Also, misses is almost twice as high as gets. I always thought that the
misses were a sub-set of the gets, which should set a max to the amount
of misses one could possibly get (misses <= gets). Is that correct?

Cheers,
Tony

Alberto Dell'Era wrote:

>> Does any-one know what the process queue reference latch does? I've
>> never seen it pop up in my monitors, but this morning in one database it
>> has an appalling miss rate:
>>
>> NAME                                 WW     IMM
>> IMMEDIATE_GETS IMMEDIATE_MISSES
>> --------------------------------------------- ---------- ----------
>> -------------- ----------------
>> process queue reference               .020905483
>> 187.158241     2390210       4473475
>>
>> (from v$latch: ww - miss ratio of willing-to-wait type gets, imm - miss
>> ratio of immediate gets, both in %)
>>
>> This database is an Oracle 10.1.0.4 64bit on Solaris 9. Today only a
>> handful of users are logged on and they are perfoming some sort of
>> system test - they complain that the system is running like a dog and
>> this is the only anomality I could find.
>
>
> Maybe bug/note 3415971.8 may help; a lot of misses on
> "process queue reference" are a very likely side-effect of that bug,
> if I interpret correctly the description (I'm not a Support Specialist
> nor a kernel developer ;)
>


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