Re: Query using Logical File

[Vernon Hamberg <vhamberg@xxxxxxxxx>]

Generally speaking, naming a logical file in a SELECT does not bias
optimization to use it. However, it looks like yours is a select/omit
logical, and then I'd say go ahead and use it. You basically have a WHERE
clause there, in the S/O statements of the logical file.

At 06:33 AM 6/14/02 +0000, you wrote:

>Consider we have a physical file with 500,000 records and a logical file
>based on this physical file with 200,000 index entries. We have the
>required set of records available through the logical file.
>
>My question is, the SQL query processing time is less if we use logical file
>in the SQL query. Is there any standard like, it is better to use a physical
>file in any SQL query? If yes, why should we use a physical file instead of
>a logical file eventhough we have the required data
>available through the logical file's access path?
>
>Any feedback is greatly appreciated.
>
>thanks.
>
>
>
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