Re: Literal SQL and sys.dual

Mohammed Shakir wrote:
>
> I am working on a database optimization project. My Shared pool is
> filled with SQL like
>
> select 0 from dual;
> select 1/1 from dual;
> select 1 - 1/(2 + 2) from dual;
>
> I tried to use the bind variables to minimize the literal SQL. However
> I need a different SQL script for each case.
>
> select :b1 from dual;
> select :b1/:b2 from dual;
> select :b1 - :b2/(:b3 + :b4) from dual;
>
> first one will handle all cases for b1 from 0 to any number which is
> good. And second sql will handle all the cases for any number for b1
> and b2. So I do reduce the literal SQL. However, I need to know ahead
> of time what type of data I am calculating and then use the appropriate
> SQL.
>
> I think the easy solution would be to use arithmetic. That is to pass
> the string like ( 1 + 1 / (2 -2) ) to some function that can return me
> the result of this sting. So I would not be using SQL script, to
> minimize SQL execution, sys.dual contention or literal SQL filling
> shared pool and causing both library cache and shared pool. Not to
> mention saving in CPU processing by not parsing SQL scripts.
>
> Anybody, aware of such function in PL/SQL? Is there any other way to do
> calculations other than 'select 1 + 1 from dual' ?
>
> I would really appreciate if you could let me know.
>
> Thanks
>
> Mohammed Shakir
>
> =====
> Mohammed Shakir
> CompuSoft, Inc.
> 11 Heather Way
> East Brunswick, NJ 08816-2825
> (732) 672-0464 (Cell)
> (732) 257-6001 (Home)
>

Mohammed,

  Don't you think, before starting with a PL/SQL function of death, that it *might* be easier to check the code and see where these statements, which are unlikely to be functional requirements, are used? Rewriting the PL/SQL code around them is probably the most efficient way to get rid of them.

-- 
Regards,

Stephane Faroult
Oriole Software
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Author: Stephane Faroult
  INET: sfaroult_at_oriole.com

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