Edmund Dengler <edmundd@eSentire.com> writes:
> Alternatively, if I created a second index, and then dropped the first,
> would this be faster (though I would suppose that an ANALYZE would need to
> be done to recognize the utility of the new index, thereby negating any
> speed improvements)?
Currently analyze doesn't check what indexes exist, it analyzes all the
columns of the table anyways. However I think this won't be true in 7.5 when
there are expression indexes, and there has been talk of changing this in
future to take into account indexes and foreign keys.
I don't think it would be any faster but it might avoid downtime. Reindex
seems to block any use of the index until the reindex completes, while doing
this two-step would avoid blocking queries. I haven't tried it myself though
so I'm not sure what gotchas might arise.
--
greg
