George/Arun,
I see that bug
1640583
is present in 8.1.6.3
but I'm
having trouble
confirming that
it is present in 8.1.5.
How can I positively
confirm
that?
This bug text does not
mention
the timed_statistics
issue.
Is there some place
where
this connection is
documented.
I need something I can
show
the application owner
that has more details
than the
text of this bug has.
The
bug text itself is not
very
enlightening.
I don't see anything
else on
Metalink that has more
details.
Any further advice is
greatly
appreciated.
Cherie Machler
Oracle DBA
Gelco Information
Network
George
Schlossnagle To: Multiple recipients of list
ORACLE-L <[EMAIL PROTECTED]>
<schlossnagle@py cc:
thian.com> Subject: Re: Shared pool wait for
library cache pin
Sent by:
[EMAIL PROTECTED]
01/03/02 12:50
AM
Please respond
to ORACLE-L
Hi,
Queries with high version counts can cause library cache latch
contention, as the query must hold that latch during soft parse and has
to go through the entire list of query versions in the data dictionary.
High version_count's are often caused by a high number of invalidations
on the query. Invalidations of a query can be caused by a number of
different things (one is the bug with timed_statistics, another is a bug
present up to 8.1.6.3 in some instances when materialized views are
used), other causes of invalidations are analyzing a dependent table or
index, or truncating a dependent table.
If this is causing you a problem, the next step is to track down what
the cause of your high version_counts is, and work to correct it or
workaround it (depending on the frequency that the query is executed, a
shared pool flush may remove all versions (or none)). If it's not
causing you a service problem currently, I would still keep an eye on
it, as the version_count for queries rises, the chances of getting
severe contention on the library cache latch increases.
George
// George Schlossnagle
// www.pythian.com -- [EMAIL PROTECTED] -- 877-PYTHIAN
// Smarter than adding another team member, Pythian has new services
// for supplementing DBAs: get our help with monitoring, 24x7 on-call,
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On Wednesday, January 2, 2002, at 04:35 PM, [EMAIL PROTECTED]
wrote:
>
> Yes, there are a handful with more than 400.
> I'm not sure what high is?
>
> Cherie
>
>
>
> "George
> Schlossnagle" To: Multiple recipients
> of list ORACLE-L <[EMAIL PROTECTED]>
> <schlossnagle@py cc:
> thian.com> Subject: Re: Shared pool
> wait for library cache pin
> Sent by:
> [EMAIL PROTECTED]
>
>
> 01/02/02 02:41
> PM
> Please respond
> to ORACLE-L
>
>
>
>
>
>
> Do any of your queries have a high version_count (visible through
> v$sqlarea)?
>
> George
>
> ----- Original Message -----
> To: "Multiple recipients of list ORACLE-L" <[EMAIL PROTECTED]>
> Sent: Wednesday, January 02, 2002 3:20 PM
>
>
>>
>> We are seeing a lot of shared pool waits (for libary cache pin) on
>> our 8.1.5 web-based application. We are seeing this via
>> Precise/Indepth
>> SQL monitoring tool.
>>
>> I haven't been able to find much documentation on shared pool waits or
>> library cache pins.
>>
>> Can anyone tell me what might be causing this problem?
>>
>> Thanks,
>>
>> Cherie
>>
>> --
>> Please see the official ORACLE-L FAQ: http://www.orafaq.com
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>> Author:
>> INET: [EMAIL PROTECTED]
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>
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: George Schlossnagle
> INET: [EMAIL PROTECTED]
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