run statspack and check your top 5 wait events. you have some kind of bottleneck 
flairing up. 
> 
> From: "Paul Vincent" <[EMAIL PROTECTED]>
> Date: 2003/07/28 Mon AM 09:39:30 EDT
> To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
> Subject: 8.1.7 instance on Solaris periodically goes sluggish, then hangs...
> 
> Hi,
> 
> rather vague, this one, I'm afraid, but we're stumped for ideas.
> 
> We have an Oracle 8.1.7 instance on a Sun Solaris setup, which we're currently 
> testing prior to going live. Every so often - 2 or 3 times a week - the users phone 
> to say the application has stopped responding. They're waiting several minutes with 
> no response. We find we can usually fire up one or two tuning apps, such as TOAD or 
> Quest's Spotlight, but within a few minutes, these also stop responding. By this 
> time, even trying to fire up a SQL*Plus session from my PC just hangs and hangs, 
> without the login ever completing. We always end up having to get the sysadmin to 
> abort-shutdown Oracle and then restart it. After which everything's fine - until the 
> next time.
> 
> I've checked the PROCESSES parameter, and this is set to 150 - way above the maximum 
> number of connections we've seen (around 40 or so). Likewise SESSIONS and 
> TRANSACTIONS parameters seem generously adequate. The sysadmin says the server 
> itself doesn't seem to be having any problems. He can log in and run UNIX commands 
> with no apparent performance problems.
> 
> Any ideas at all would be very welcome!
> 
> Paul Vincent
> Oracle DBA
> University of Central England
> -- 
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> -- 
> Author: Paul Vincent
>   INET: [EMAIL PROTECTED]
> 
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