At 08:15 2018-01-25, mbsoftwaresolutions@mbsoftwaresolutions.com wrote:

>On 2018-01-24 18:39, Fernando D. Bozzo wrote:

>>When the index is evaluated initially, VFP knows exactly what fields affect

>>what index, so really just affected indexes are updated.

>>It's easy to test it. just make an old index (IDX) on two different fields:

>>CREATE TABLE test (field1 C(10), field2 I)

>>INDEX on field1 TO test_f1 additive

>>INDEX on field2 TO test_f2 additive

>>Add some data, wait a minute, replace one of the fields and do a FLUSH

>>FORCE, and you will see that only the affected index changes his timestamp.

>I don't think that's a fair test to use IDX files since this example

>uses a CDX file, and it's all in the same file.

I think it *is* a fair test for exactly that reason. If you

see only one of the IDX index files change, that suggests that VFP

only updates an index where it would make a difference.

I grant that it could be that that optimisation does not exist

in the CDX handling, but how likely do you think that is?

Sincerely,

Gene Wirchenko

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