Re: Why is UseDeclareFetch so slow?

[David Gardner <david(at)gardnerit(dot)net>]

It has been my experience, which is largely with Access as a client, 
already attempts to perform similar optimizations to my queries.
Often Access will take a query like:

SELECT * FROM PersonTbl;

and turn it into:

SELECT * FROM PersonTbl WHERE "PersonID" = 10566 OR "PersonID" = 10568 
OR "PersonID" = 10365 OR "PersonID" = 10705 OR "PersonID" = 10390 OR 
"PersonID" = 10391 OR "PersonID" = 10392 OR "PersonID" = 10447 OR 
"PersonID" = 10403 OR "PersonID" = 10414;

> Yes, but the real question is why is the query 4 times slower when
> UseDeclareFetch is enabled (FETCH was set to 100)?
>
> I would have expected that the ODBC driver is fetching 100 rows in advance and
> thus the query should execute in less than a second instead of 30 seconds.
>
> Rainer
>
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