Re: Query Speed!!!
От | Thirumoorthy Bhuvneswari |
---|---|
Тема | Re: Query Speed!!! |
Дата | |
Msg-id | 20020711114830.17515.qmail@web13609.mail.yahoo.com обсуждение исходный текст |
Ответ на | Re: Query Speed!!! (Chris Albertson <chrisalbertson90278@yahoo.com>) |
Ответы |
Re: Query Speed!!!
(Chris Albertson <chrisalbertson90278@yahoo.com>)
|
Список | pgsql-general |
hi, my query looks like this: select * from loom_details where date>='2002-06-01' and date<='2002-06-30'. * I do give 'select *' since all the columns are required for the report. * When I give the above query in the 'psql' prompt it waits for 1 second to fetch the records and displays the entire rows(about 3000). * There are about 10,000 records total in the table. * When I run the report, it actually does not increase the RAM usage but takes about 90% of the CPU time leaving all the other queries behind it. Please tell me how can I increase the speed. thanks. regards, T.Bhuvaneswari. --- Chris Albertson <chrisalbertson90278@yahoo.com> wrote: > > --- Hans-Juergen Schoenig <hs@cybertec.at> wrote: > > Thirumoorthy Bhuvneswari wrote: > > > hi, > > > I am using Postgresql-7.1.3 with RedHat > Linux-7.1 and > > > JDBC. I am having an indexed table with nearly > 3,000 > > > records for a month. My machine is with 256 MB > RAM, > > > 600 MHz. I am having a report from the abovesaid > > > table, which displays 1 month's records at a > stretch > > > using Swing components. If I run the query from > the > > > hard-disk > > > it takes about 5 seconds to display all the > 3,000 > > > records. If I connect 3 nodes to it and run the > query > > > from a node, it takes about 1.5 minutes. I don't > know > > > where I am wrong. Please do reply. thanks. > > Please tell us two more things: > > 1) If you enter the query by hand at the psql prompt > how > long does the query take? > > 2) What is the SQL query? Show us the SQL you > entered. > > I would expect much beter 10x to 100x speeds for > most "normal" > queries. But do the above _after_ a "vacuum full > analyze" > > ===== > Chris Albertson > Home: 310-376-1029 > chrisalbertson90278@yahoo.com > Cell: 310-990-7550 > Office: 310-336-5189 > Christopher.J.Albertson@aero.org > > __________________________________________________ > Do You Yahoo!? > Sign up for SBC Yahoo! Dial - First Month Free > http://sbc.yahoo.com > > > > ---------------------------(end of > broadcast)--------------------------- > TIP 6: Have you searched our list archives? > > http://archives.postgresql.org __________________________________________________ Do You Yahoo!? Sign up for SBC Yahoo! Dial - First Month Free http://sbc.yahoo.com
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