History on dynamic parameters

Hi,

I'm a junior DBA and I have an Oracle 9.2.0.4.0 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) ?

Regards
Jürgen Mortier

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