Subject:
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Re: Gallery speed
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Newsgroups:
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lugnet.off-topic.geek
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Date:
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Fri, 6 Jul 2001 01:02:53 GMT
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Viewed:
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1698 times
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Kevin Loch wrote in message ...
> here's the "slow" query that is currently limiting performance:
>
> SELECT DISTINCT file_parent FROM files ORDER BY file_modify_time DESC LIMIT
24
> omitting the DISTINCT above causes it to return instanly but with many
> duplicates, since there is often more than one new image per folder.
Might be quicker to do it in 2 stages, first the line above without the
DISTINCT into a cursor, then do a SELECT DISTINCT from that.
SELECT file_parent FROM files ORDER BY file_modify_time DESC into cursor
temp
SELECT DISTINCT file_parent FROM temp LIMIT 24
Kevin
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Message has 1 Reply:
 | | Re: Gallery speed
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| (...) This probably wouldn't help much - the cursor isn't indexed, so the SELECT DISTINCT would be slow. A better way to split it (assuming your back-end has a decent optimiser) may be to create an index on file_parent + file_modify_time, then do: (...) (25 years ago, 6-Jul-01, to lugnet.off-topic.geek)
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Message is in Reply To:
| | Gallery speed
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| I think I've fixed the painfully slow performance of the "recent" page. There were some indexes missing in the database that really should have been there. It loads reasonably fast now (~.8 seconds unless the machine is really busy). If there are (...) (25 years ago, 5-Jul-01, to lugnet.general, lugnet.off-topic.geek)
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