topic Re: Sybase performance in Operating System - HP-UX

Sybase performance

Ken Hubnik_2 — Fri, 26 Jul 2002 17:47:29 GMT

I have a sybase dataserver process that runs high cpu with a wait state on PRI. Attached is a glance snapshot. Freshly installed 11.00 O/S with current patches applied. The DBA's are trying to a large table. Any clues?

Re: Sybase performance

Martin Johnson — Fri, 26 Jul 2002 18:09:53 GMT

Has the database been tuned? Has the table been indexed? Look at your cache hit ratios. They should be in the high 90s.

HTH
Marty

Re: Sybase performance

David Totsch — Sat, 27 Jul 2002 00:46:59 GMT

Ken:

It has been a long time since I have dealt with Sybase, but...welcome to Sybase. There is a reason you configure N-1 dataservers (where N is the number of CPUs). Each dataserver process will consume a CPU, even when the database is "quiet". Maybe someone will tell us that this is antiquated knowledge.

-dlt-

Re: Sybase performance

Johan Bergwitz — Tue, 30 Jul 2002 10:03:55 GMT

Does the machine run other applikations also? It seems that you have more CPUs availible that you might consider to run Sybase on. The parameter "Online engines" states how many processes it should run. Inside Sybase, sp_sysmon shows how Sybase thinks of its performance.

Regards
Johan