DB Optimizer: Statistics on function in predicates for CBO

Thursday, September 3, 2009

Statistics on function in predicates for CBO

ASSOCIATE STATISTICS WITH FUNCTIONS my_function DEFAULT SELECTIVITY 0.1;
ASSOCIATE STATISTICS WITH FUNCTIONS my_function DEFAULT COST (10000, 1000, 0) /* cpu,io,net */;
http://www.oracle-developer.net/display.php?id=426#

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Kyle Hailey

I'm Kyle Hailey and I'm the designer and product manager behind Embarcadero's

DB Optimzer

Before working at Embarcadero I redesigned the performance pages in Oracles OEM 10g (see a before and after example). I am on the patent from the team for our tuning methodology (Patents: 20060059205) . I freely provide graphical monitoring tools such as ASHMON (TCL/TK) as well as scripts to profile database load such as S-ASH ie Simulated ASH (PLSQL). S-ASH, ASHMON and more are available at my old site http://ashmasters.com/ . I have made available C code to directly read profiling data out of Oracle's memory structures, called Direct Memory Access. I speak at conferences and give classes around the world.This blog has some of my new ideas on Visual SQL Tuning (VST), work on DB Optimizer, possibly some past material on DB performance monitoring as well as lots of references and pointers to other information on the web that I find important and worth emphasizing.

DB Optimizer

Thursday, September 3, 2009

Statistics on function in predicates for CBO

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