Mark Weaver wrote:
>
> Thus far, I have got terrible performance out of Oracle. Using Oracle
> 8.1.7.5, plus OraOLEDB 8.1.7.2. I can't find any later 8.1.7 patches -
> please let me know if I'm missing something.
>
> The scenario is:
>
> COM object implemented in VB+ADO+OraOLEDB for storing session data.
> ASP page requested retrieves a BLOB containing the session data (via ADO
> with server side recordsets) and reads this into a dictionary.
> BLOB is typically 4K.
>
> Connecting to a fairly well spec'd DB (7x10,000 RPM SCSI disks with
> index/data/logs/os/redo spread about, dual PIII-800Mhz CPUs, 1GB) from
> a-hopefully-up-to-the job webserver (2xPII 450Mhz CPUs, 1GB) which doesn't
> seem too stressed, then I get massive memory usage (~100Mb) with only about
> 12 pages/second. Now with the same running under SQL server I get much
> better than this, so I assume that I'm missing something. Oracle is running
> in MTS mode to support the apparently very large number of connections
> created by the webserver (typically around 500). For comparison purposes, I
> have a C/OCI app running in the webserver that uses persistent connections,
> applies DB based security to every request received and gets around 200
> pages/second - nearly 20x the performance).
>
> Now my questions are:
>
> 1) Why are there so many connections?
> 2) Why is the performance so poor?
> 3) What can I do to improve on this?
>
> Thanks,
>
> Mark
1. Don't know - who specified this number of connections for MTS and
wrote the application to open so many?
2. Don't know - how big is the SGA, what are the buffer hit ratios,
what kind of disk performance are you getting, what kind of network
issues are you having, etc.
3. Have your DBA start investigating issues in #1 and #2.
--
Ron Reidy
Oracle DBA
Reidy Consulting, L.L.C.
Received on Tue Oct 23 2001 - 21:07:57 CDT
