Re: SYSTEM TUNING

[Betsy Moore <betsy.e.moore@xxxxxxxx>]

Rule 1 - get all of your PTF's on the system.  Even if they do not fix any
performance issues, many people will not look at anything else until PTF's are
current.

Tuning requires an understanding of the characteristics of the workload on the
system and then a plan to optimize for those characteristics can be developed 
and
implemented.  Auto tuning often works but how well it works is dependent upon 
the
type of workload.  The most accurate tuning is performed closest to the
applications. Sometimes the code cannot be changed and inefficient code can only
be tuned to a certain degree externally so, sometimes that means throwing some
hardware at it to overwhelm the code issues if adjusting memory pools,
priorities, subsystems, etc does not resolve the issues.

Remember that sometimes you can check everything in the Performance and Tuning
Guide guidelines and your numbers look great but performance still isn't great.
User perception is the real measure of success because sometimes things are
running great, performing as designed, but that doesn't necessarily mean it
performs how it must to keep the business running.

In my experience, anyone who tells you they can fix it in a short period of time
without understanding the workload and having an iterative process for
adjustment, probably cannot.

Debbie Helms wrote:

> Tell me are there any real expert system tuners out there?  Can a system be
> tuned in a day at the very most a week?   I need some system tuning
> information where is the best place?
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