Re: slow server
От | Marc Wrubleski |
---|---|
Тема | Re: slow server |
Дата | |
Msg-id | 3ACA200E.C9274496@sorexsoftware.com обсуждение исходный текст |
Ответ на | slow server (Marc Wrubleski <mlwruble@sorexsoftware.com>) |
Список | pgsql-general |
More info on this problem ... The Query: select acc.expiringCredits, acc.earnedCredits, acc.purchasedCredits, acc.statusid, acc.expired from accounts acc, gateways g where g.gwnumber = '02000000' and g.accountid = acc.accountid ; _________________ - PIII system. (returns results in .75 seconds per query) PostgreSQL 7.0.3 on i686-pc-linux-gnu, compiled by gcc egcs-2.91.66 running on RedHat 6.2 (with Kernel 2.2.16) Merge Join (cost=8.30..80.93 rows=100 width=25) -> Index Scan using accounts_accountid_key on accounts acc (cost=0.00..60.00 rows=1000 width=21) -> Sort (cost=8.30..8.30 rows=10 width=4) -> Index Scan using gateways_gwnumber_key on gateways g (cost=0.00..8.14 rows=10 width=4) ________________ Celeron system (returns results in .002 seconds per query) PostgreSQL 7.0.2 on i686-pc-linux-gnu, compiled by gcc 2.96 running on RedHat 7.0 Merge Join (cost=8.30..80.93 rows=100 width=25) -> Index Scan using accounts_accountid_key on accounts acc (cost=0.00..60.00 rows=1000 width=21) -> Sort (cost=8.30..8.30 rows=10 width=4) -> Index Scan using gateways_gwnumber_key on gateways g (cost=0.00..8.14 rows=10 width=4) I hope this can shed light somewhere. I'm need a starting point where I should start looking. I don't understand why Postgres 7.03 would be so much slower than 7.02. Marc Tom Lane wrote: > Marc Wrubleski <mlwruble@sorexsoftware.com> writes: > > Hi, I have two systems one is a 500Mhz Celeron with 128 MB ram and IDE > > Disks, the other is 800Mhz PIII, 512MB RAM, SCSI Disks. > > > Obviously the PIII should stomp on the performance of the Celeron, but > > my postgres installation on the faster system is MUCH slower. > > > I simple query on two tables joined on the celeron takes about .002 > > seconds. On the PIII it takes .75 seconds. Same Query, same tables, same > > indexes. The results from explain are the same. the results from the > > query are the same. > > > Any Ideas? > > You've managed to tell us absolutely *nothing* of value here. What > Postgres version, what queries, what query plans exactly? > > > One thing to think about is the PIII was installed via RPM and the > > Celeron wass compiled on that machine. Could this be the limiting > > factor? > > Kinda makes me wonder if they are different PG versions and/or different > configuration options ... > > regards, tom lane > > ---------------------------(end of broadcast)--------------------------- > TIP 2: you can get off all lists at once with the unregister command > (send "unregister YourEmailAddressHere" to majordomo@postgresql.org)
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