Jim Fulton wrote at 2005-5-26 14:43 -0400:
> Probably the indexes that we *most* want to avoid reindexing are
> text indexes. We have a ISearchableText interface that we
> commonly adapt objects to to get the text to index. We really
> can't predict how this text is computed.
Then, we probably do something wrong...
> A safer strategy seems to me to be to have the indexes themselves
> responsible for detecting changes that they care about. I'm
> pretty sure that some of the Zope 2 indexes are careful to avoid
> reindexing, or at least avoid updating indexes if indexed values
> haven't changed.
Even computing the value for a text index (without any change
to the index itself) can be very expensive: it may
include expensive fetching of a large object,
an expensive conversion (text extraction), expensive splitting
and comparison to what is currently indexes.
I would not like this overhead for e.g. workflow state changes by
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