Re: Scrollable cursors and Sort performance
От | Tom Lane |
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Тема | Re: Scrollable cursors and Sort performance |
Дата | |
Msg-id | 23047.1141081281@sss.pgh.pa.us обсуждение исходный текст |
Ответ на | Re: Scrollable cursors and Sort performance ("Jim C. Nasby" <jnasby@pervasive.com>) |
Ответы |
Re: Scrollable cursors and Sort performance
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Список | pgsql-hackers |
"Jim C. Nasby" <jnasby@pervasive.com> writes: > On Mon, Feb 27, 2006 at 02:17:23PM +0000, Simon Riggs wrote: >>> Possibly we could make EXPLAIN ANALYZE EXECUTE set the random-access >>> bits. >> >> Good point. Whichever we do will be wrong in some cases.... I've no real >> opinion on this other than a vague preference for it to be quick. > Wouldn't an EXPLAIN ANALYZE DECLARE ... have the right information to > know if backward scan, etc was needed? There is no EXPLAIN ANALYZE DECLARE, and AFAICS it would be a contradiction in terms to have one, since DECLARE doesn't run the query. Perhaps the correct addition would be EXPLAIN ANALYZE FETCH. (EXECUTE is unrelated, now that I think harder about it.) regards, tom lane
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