Re: multiple sql update w/ major time issues
От
Tom Lane
Тема
Re: multiple sql update w/ major time issues
Дата
Msg-id
12898.992370840@sss.pgh.pa.us
Ответ на
multiple sql update w/ major time issues (iu_23@hotmail.com (Dawn))
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multiple sql update w/ major time issues iu_23@hotmail.com (Dawn)
Re: multiple sql update w/ major time issues Tom Lane <tgl@sss.pgh.pa.us>
iu_23@hotmail.com (Dawn) writes: > I have a sql update statement that is dealing with hundreds of > thousands of records. It takes hours and hours to complete (if it > does complete and not take down the server). No wonder, if you write it like that. You're forcing a fresh select from gl_totals for each row of aud_member_ext_attributes; then you're doing it again for each UPDATE command. If you were using Postgres (which I surmise you are not, because it doesn't accept aliases in UPDATE) you could do update aud_member_ext_attributes setEXTVALUE217 = gl_totals.MTD,EXTVALUE223 = gl_totals.YTD,EXTVALUE229 = gl_totals.R12 where gl_totals.category = 'tankrent' and gl_totals.CUST_NO = EXTVALUE101 and gl_totals.DIST_NO = EXTVALUE102 and gl_totals.SUB_NO = EXTVALUE105 and gl_totals.FUEL_TYPE = EXTVALUE123; regards, tom lane
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