sybase optimizer statistics


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

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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.

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