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Exact and deleted recs - did everybody know this but me?
Message
De
25/07/2006 09:03:44
Neil Mc Donald
Cencom Systems P/L
The Sun, Australie
 
 
À
25/07/2006 08:29:27
Mike Yearwood
Toronto, Ontario, Canada
Information générale
Forum:
Visual FoxPro
Catégorie:
Codage, syntaxe et commandes
Divers
Thread ID:
01139176
Message ID:
01139650
Vues:
13
Hi,
As stated in a previous message it was only to test how rushmore did it's index matchup and check if any changes in VFP9 had made any difference.

BTW on 10mil records the DELETED() binary index adds about 0.02secs to the run.

>>>Do you have an index on ALLTRIM(BATCHNO)? I think we should avoid ALLTRIM in index expressions like plague.
>>
>>Yes, Not duplicating the index statement exactly in the SQL clause causes greatly reduced performance. i.e. using just BATCHNO when the index is ALLTRIM(BATCHNO) will not optimize.
>
>You should not use ALLTRIM() in indexes. Far better to INDEX ON PADR(ALLTRIM(BATCHNO),10) and then to SELECT WHERE PADR(ALLTRIM(BATCHNO),10) = "batchno "
>
>>
>>Also getting the SET EXACT and SET ANSI settings correct also impacts greatly.
>>
>>Rushmore is a great piece of technology, once you understand it.
Regards N Mc Donald
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