At 08:15 2018-01-25, [email protected] 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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