Re: Limit clause not using index
От | Kevin Grittner |
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Тема | Re: Limit clause not using index |
Дата | |
Msg-id | s2b94874.032@gwmta.wicourts.gov обсуждение исходный текст |
Ответ на | Limit clause not using index (Yves Vindevogel <yves.vindevogel@implements.be>) |
Список | pgsql-performance |
I just tried this on 8.0.3. A query which runs very fast through an index on a 25 million row table blocked when I dropped the index within a database transaction. As soon as I rolled back the database transactiton, the query completed, the index appears fine, and the query runs fast, as usual. So, it looks like this is right except for the assertion that the index is still available for other queries. -Kevin >>> Tobias Brox <tobias@nordicbet.com> 06/21/05 2:46 PM >>> [John A Meinel - Tue at 10:14:24AM -0500] > I believe if you drop the indexes inside a transaction, they will still > be there for other queries, and if you rollback instead of commit, you > won't lose anything. Has anyone tested this? (sorry, I only have the production database to play with at the moment, and I don't think I should play with it ;-) -- Tobias Brox, Beijing ---------------------------(end of broadcast)--------------------------- TIP 3: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to majordomo@postgresql.org so that your message can get through to the mailing list cleanly
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