sql - ignoring index...

Hi

Oracle 8.0.5
Tru64 Unix 4.0f

> Have you any idea whether you can force the usage of the first column in a
> multi-column index with a hint?
> The code below works fine to force key order lookups on non-unique indices
> where the column specified in the hint has it's own non-unique index. But
> it doesn't like it here, where the only index is a unique one over 3
> columns. I was hoping it would still be able to read the first column as
> if it were a non-unique index on its own. If not I'll have create a new
> non-unique index on this column only - and hope the optimiser will
> understand what I mean with the hint !
>

Regards

Lee

> SQL Explain Plan for:
>
> SELECT pandg_customer_key FROM (SELECT /*+ INDEX(PG_EI_CUSTOMER_PHONE
> pandg_customer_key) */ rownum rn, pandg_customer_key FROM
> PG_EI_CUSTOMER_PHONE WHERE pandg_customer_key >= 0) temp WHERE
> MOD(temp.rn, 100000) = 1
>
> is:
> SELECT STATEMENT Cost = 225
> VIEW
> COUNT
> TABLE ACCESS FULL PG_EI_CUSTOMER_PHONE
>
>
>
>

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Author: Robertson Lee - lerobe
  INET: lerobe_at_acxiom.co.uk

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