RE: Another V5R2 question

My understanding is that what IBM has done isn't that they made SQL less 
efficient.  Rather, they have made their version of SQL more compliant with the 
ANSI standard. Prior releases/versions allowed programmers to be a little 
"sloppy" in how they coded SQL and somehow the optimizer or the compiler or ? 
made up for the poor coding.  

I also believe they've supposedly improved the efficiency of the optimizer so 
that well-coded statements should perform better.

There is a redbook on this topic:  "Preparing for and Tuning the V5R2 SQL Query 
Engine on DB2 Universal Database for 
iSeries".  This Redbook gives a broad understanding of the new architectural 
changes of the database concerning the query optimizer. It explains the 
following:

* The architecture of the new query optimizer

* The new data access methods used by the optimizer

* The new Statistics Manager included in V5R2

* The feedback changes of the new query optimizer

* Some performance measurements


The Redbook is available at 
http://publib-b.boulder.ibm.com/Redbooks.nsf/RedpieceAbstracts/sg246598.html?Open.

==Kevin


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