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  3. October 2013

Re: Stored Procedure Speed/Visual Explain

On 10/21/13 10:16 AM, Michael Ryan wrote:
That's what I'm thinking....build the statement (dynamic). It seems I
would have a lot of indexes - 10 based on the 'between' criteria.
This selection logic is used a lot - for subfile load on a green
screen and for exposing a result set to PHP. If I was to make this
dynamic (which I believe means creating the SQL statement by building
a string and executing it), would I have issues because the access
plan will be rebuilt every execution of the program?


Built using parameter markers, the query can be optimized more generically, and the /same/ query [though with different values] can be reused. For example the following as the dynamically composed query can implement with a plan that allows any value for the variable values supplied on the USING clause; i.e. each time it is the /same/ query, and only its replacement values change:

Select * From INVMSTP
Where Imvnda Between ? And ?
and Immdl Between ? And ?


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