Re: History on dynamic parameters

  • From: Tim Gorman <tim@xxxxxxxxx>
  • To: dannorris@xxxxxxxxxxxxx
  • Date: Wed, 08 Aug 2007 10:18:38 -0600

The table is STATS$PARAMETER and there is a SQL*Plus script named "sp_parm_changes.sql" at to display this information...

Dan Norris wrote:
If you're taking statspack snapshots, you can also find the non-default parameters captured in the statspack repository. I don't remember the exact table in the STATS$ tables, but it shouldn't be that hard to find if you're really desperate (and you're taking regularly-scheduled snapshots).


----- Original Message ----
From: Andrew Kerber <andrew.kerber@xxxxxxxxx>
To: jurgen_mortier@xxxxxxxx
Cc: oracle-l@xxxxxxxxxxxxx
Sent: Wednesday, August 8, 2007 8:43:04 AM
Subject: Re: History on dynamic parameters

There should be a record of the changes in the alert log if you can find the entries from that far back.

On 8/8/07, jurgen_mortier@xxxxxxxx <jurgen_mortier@xxxxxxxx> wrote:

I'm a junior DBA and I have an Oracle running on Solaris 8 which
has been restarted on July 28th (by my collegue currently on FTO) to change
some parameters:
- shared_pool_reserved_size= from 60M to 100 M
- shared_pool_size= from 600M to 1000M
- undo_retention= from 1800 to 3600

Since then users report that queries are running twice as long as before.

On August 2nd I tried to change back the last 2 parameters (since they were
dynamic), but the CKPT process was consuming 1 complete CPU and I was
forced to reboot the system on the 3rd. At that time I changed the
parameters back to 600M and 1800 seconds.

Since that didn't improve the response time, I started realizing that other
dynamic parameters might have been changed dynamically without the init
file being updated.

Does anyone know of a way to find back the history of those (dynamic)
parameters (accross DB restarts) ?

Jürgen Mortier

AMI Semiconductor - "Silicon Solutions for the Real World"
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Andrew W. Kerber

'If at first you dont succeed, dont take up skydiving.'


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