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----- Original Message -----
From: Bill Downall
To: RBASE-L Mailing List
Sent: Friday, May 08, 2009 9:30 AM
Subject: [RBASE-L] - Re: 7.5 vs V8 speed
Ben and Marc,
parens around the whole condition or a group of conditions can affect the
order of indexes. However, to force the non-usage of an index, don't
parenthicate the whole condition, just the value to the right of the operator.
That way you turn the value into an expression, and R:BASE figures it needs to
evaluate it for each row. That would be t_1.tr_type = ('1')
Bill
On Fri, May 8, 2009 at 9:23 AM, Ben Petersen <[email protected]> wrote:
Hi Marc,
I'm looking at
> (t_1.tr_type = '1') AND
I don't recall -- do parens force usage of an index, or the reverse?
Regardless, you might try w/o them.
Is tr_type actually a string data type (single quotes)?
I understand that the main question is why it takes twice as long
under v8 to print the report, but one thought might be to limit the
data, either in the view or the where clause for the report.
So
> WHERE +
> (t_1.tr_type = '1') AND +
might become something like
> WHERE +
dr_num = 1234 and +
> (t_1.tr_type = '1') AND +
Assuming dr_num (or what ever limiting data) is indexed, and early in
the where clause, the report should start pretty quickly.
> If the report is based off a view why
> does it access the individual tables?
Someone mentioned earlier that a view is just a stored Sql Query,
there is no data stored in a view. They are also referred to as
"pseudo tables" because, just like this report, you can refer to a Sql
Query as though it is a table. Of course you can stack one view on top
of another if need be. So views are just a convenient way for
referring to/using queries.
Since selecting against this view is as fast as it was under 7.5
(that's correct??) I think the suggestions referring to settings in
the report itself make the most sense. If your view construct was
faulty I would think performance would be poor under both platforms.
Ben
