vb.org Archive - select from table "user" query slow

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- - select from table "user" query slow (https://vborg.vbsupport.ru/showthread.php?t=263466)

entertain

05-11-2011 11:39 AM

select from table "user" query slow

I wanted to optimize some queries in iTrader and found a problem when loading the latest traders in combination with a huge user table.

A query looks like that:

Code:

                $itrader_shame_get = $vbulletin->db->query_read_slave("

                        SELECT itrader_total, itrader_pcnt, username, userid, joindate

                        FROM " . TABLE_PREFIX . "user

                        WHERE itrader_total < 0

                        ORDER BY itrader_total ASC

                        LIMIT $mainpagelimit

                ");

When you have a big user table, the query needs a few seconds to finish.

Do you have any idea how this could be enhanced?

kh99	05-11-2011 01:41 PM

I'm not a mysql expert by any means, but I think you could speed up that query by adding an index on itrader_total to the user table. What I don't know is what effect maintaining that additional index might have on other queries done to the user table (because of course changes to itrader_total need to modify the index).

entertain

05-11-2011 04:54 PM

That really helped to reduce the time of my page loads from 5 seconds to 0.1 second - thank you very much! :)

Boofo

05-11-2011 05:15 PM

From what I have been reading, indexes help "find the rows matching a WHERE clause quickly."

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