• Subject: Re: Query Optimizer
  • From: Pete Hall <pbhall@xxxxxxxxxx>
  • Date: Tue, 09 Nov 1999 21:32:38 -0600

At 11:01 11/09/1999 , R. Bruce Hoffman wrote:
>You said it didn't use the access path, that it built it's own. So I also
>assume that you had the job in debug mode to get the messages? If so, then
>did you just get the message that it was building an access path because no
>usable path was found?  Or did you get a message about the other index being
>checked but not usable?

That's what puzzled me. The reason was "4 - The cost to use this access 
path, as determined by the optimizer, was higher than the cost associated 
with the chosen access method." (which of course, was to build an access 
path, with an identical key.) The internal join key hypothesis seems 
reasonable.

>As for the messages about indexes needed, are you using the Database monitor
>(STRDBMON) output information? If you have V4R4, have you looked at the
>database functions in OpsNav?

STRDBMON sounds like something I need to know about. Thanks. We're 
currently at V4R3.
Pete Hall
pbhall@execpc.com
http://www.execpc.com/~pbhall
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