Scott Marlowe escribió:
> > Aren't you mixing up REINDEX and CLUSTER?
>
> I don't think so. reindex (which runs on tables and indexes, so the
> name is a bit confusing, I admit) basically was originally a "repair"
> operation that rewrote the whole relation and wasn't completely
> transaction safe (way back, 7.2 days or so I think). Due to the
> issues with vacuum full bloating indexes, and being slowly replaced by
> regular vacuum, reindex received some attention to make it transaction
> / crash safe and has kind of take the place of vacuum full in terms of
> "how to fix bloated objects".
Hmm, REINDEX does not rewrite tables. If there are dead tuples, they
will still be there after REINDEX.
> cluster, otoh, rewrites the table into index order.
... excluding dead tuples, and then rewrites all the indexes.
--
Alvaro Herrera http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.
