There are a lot of issues including memory leaks and shared pool problems
that forced us to upgrade from 8.1. to 8.1.7.2
It's Oracle on Solaris.
Contact Oracle Support.
Regards,
Waleed
-----Original Message-----
Sent: Thursday, January 03, 2002 8:35 AM
To: Multiple recipients of list ORACLE-L
Jared,
We were seeing from 2 or 3 up to a dozen shared pool waits at a time
for about 200 users.
We normally haven't been seeing shared pool waits at all on this
application. It was an unusual one to investigate.
Our developer was extremely concerned about this issue and
brought it to our attention. Eventually the problem peaked at
mid-day and performance for our end-users was twice as slow
for people using the web-based app.
We finally flushed the shared pool and all the waits cleared right
up. Performance on an overnight batch job that had been creeping
up longer and longer was six times faster.
Must be some sort of shared memory leak or open cursor problem.
We're looking at the SQL with a lot of open cursors but after flushing
the shared pool, there didn't seem to be an inordinent amount of
open cursors for the number of users out there.
We also bounced the database last night during our weekly
maintenance window in order to clean everything our.
Today we are tasked with trying to figure out how/why this leak happened
and how we can prevent it from happening again.
This is a web-based application with Java Applets. Unix Sun Solaris 2.6
back-end with 8.1.5 database. We also have a Checkpoint firewall between
the backend and the front end but I doubt that has anything to do with it.
Thanks for your interest,
Cherie
Jared.Still@ra
disys.com To: [EMAIL PROTECTED]
cc: [EMAIL PROTECTED]
01/02/02 03:35 Subject: Re: Shared pool wait
for library cache pin
PM
Cherie,
What constitutes 'a lot of shared pool waits (for libary cache pin)'?
Does it represent a significant percentage of total waits, or is it just
crossing some predetermined threshold?
Is it causing a performance problem?
( as seen by users, not by a monitoring tool )
Jared
Cherie_Machler
@gelco.com To: Multiple recipients of
list ORACLE-L <[EMAIL PROTECTED]>
Sent by: cc:
[EMAIL PROTECTED] Subject: Shared pool wait for
library cache pin
om
01/02/02 12:20
PM
Please respond
to ORACLE-L
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
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