sybase optimizer statistics

Hi

Is there any document explains the contents of sysstatistics (histogram  structure & density)  in detail and the algorithm used in query costing?  

thanks
CS
CHANAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Joe WoodhousePrincipal ConsultantCommented:
The standard ASE manuals available from the SAP site discuss these in some degree. You'd want the various Performance and Tuning manuals for your version of ASE.

They are discussed a lot more in the Performance & Tuning - Query Optimiser course, but even that doesn't really go into a lot of detail of the internals of the optimiser algorithms since, well, that's probably regarded as proprietary commercial information.

There was a very old white paper written up for these things for the 11.9.2 version of ASE. That's 15 years old now and there was a substantial rewrite of the optimiser for version 15.0 anyway.

Take a look at the Performance & Tuning manuals especially the one on statistics, and post a followup here if you have a specific question.
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Sybase Database

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.