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  2. RPG400-L
  3. April 2004

RE: Performance of SQL

Narsi Wrote:
I thought db2 is intelligent enuf to  choose the best availabel accept path.

Also if you use visualexplain the optimizer would make suggestions as to
what 
kind of a index could be created to improve SQL performance. 

Narsi
--------------------------------------------
Yes, but the access path must exist.  DB2 is marvelously intelligent, and
will provide intelligent feedback as to which access paths are considered,
and if they are not used, why not.  

In my experience with SQL on any platform, indexing is the science of
improving performance.  And with DB2, there are Binary Radix tree, AND the
Encoded Vector index types.  One could write for hours and pages about the
science of indexing.  

Tony Carolla
MedAmerica Billing Services, Inc.

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