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  3. January 2011

Re: Behavior of indexes after run a CLRPFM

Rui

I don't know if we know enough of what you are doing, to answer this. The optimizer makes its choice of access plan, based on many criteria, including the number of records in a table, the frequency of certain values, other statistics, and how the machine is running, like memory available, other jobs, etc. A CLRPFM could affect some of these.

I suggest using Visual Explain to see why a certain index was selected. There are just too many influences on the process.

Vern

On 1/20/2011 4:22 AM, Rui wrote:
Hello.

Sometimes, when I run some SQL operations (like a select), the SQL Optimizer
does not use the correct index.
Before I load the table, I run a CLRPFM over it.
Can the CLRPFM be responsable for the non-use of the indexes? The RGZPFM fix it?

Best Regards,

Rui




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