Friday, June 19, 2009

practical, everyday sybase tuning in GS (accord2Nikhil

My GS system was database centric. Most important queries hit large 10GB tables. We deal with slow queries (mostly select) on a
daily basis. If a query is slower than usual

* query plan -- is the join correct?
* query plan -- is the correct index used?
* query plan -- any table scan?
* update stat right away if necessary. Note we already run that automatically on a weekly basis.

Most of the time that's enough. Occassionally, we also use
* partition (horizontal) into history tables
* partition (vertical) into 2 narrower tables (Main comm and trd tables + Trade Staging table)

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New York (Time Square), NY, United States
http://www.linkedin.com/in/tanbin