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27 discussions - 243 posts

  • Database performance geeks, We have a number of patches pending for 8.4 designed to improve database performance in a variety of circumstances. We need as many users as possible to build test ...
    Josh BerkusJosh Berkus
    Dec 7, 2008 at 7:38 pm
    Dec 14, 2008 at 5:49 am
  • Has anyone benchmarked this controller (PCIe/4x, 512 MB BBC)? We try to use it with 8x SATA 1TB drives in RAID-5 mode under Linux, and measure strange values. An individual drive is capable of ...
    Mario WeilguniMario Weilguni
    Dec 2, 2008 at 9:22 am
    Dec 11, 2008 at 1:47 pm
  • Hi all, So after a long hiatus after running this OLTP workload at the OSDL, many of you know the community has had some equipment donated by HP: a DL380 G5 and an MSA70 disk array. We are currently ...
    Mark WongMark Wong
    Dec 21, 2008 at 12:54 am
    Feb 22, 2009 at 11:03 pm
  • Hi, I am re-posting my question here after trying to find a solution in the PHP pgsql list with no luck. I am experiencing some performance issues that I think are stemming from prepared statements. ...
    Dec 30, 2008 at 6:59 pm
    Jan 30, 2009 at 7:41 pm
  • Hi, I've discovered a peculiarity with using btrim in an index and was wondering if anyone has any input. My table is like this: Table "public.m_object_paper" Column | Type | Modifiers ...
    Richard YenRichard Yen
    Dec 9, 2008 at 10:33 pm
    Dec 11, 2008 at 1:44 am
  • SQL: update product set sz_category_id=null where am_style_kw1 is not null and sz_category_id is not null query plan: "Seq Scan on product (cost=0.00..647053.30 rows=580224 width=1609)" " Filter: ...
    Laszlo NagyLaszlo Nagy
    Dec 22, 2008 at 11:06 am
    Dec 29, 2008 at 1:30 pm
  • Hi, we have a some bad queries (developers are working on that), some of them run in 17 secs and that is the average but when analyzing logs i found that from time to time some of them took upto 3 ...
    Jaime CasanovaJaime Casanova
    Dec 16, 2008 at 7:34 pm
    Dec 17, 2008 at 9:15 pm
  • Hi. I have a problem on one of our production servers. A fairly complicated query is running, and the backend process is using 30 GB of RAM. The machine only has 32GB, and is understandably swapping ...
    Matthew WakelingMatthew Wakeling
    Dec 3, 2008 at 4:01 pm
    Dec 4, 2008 at 1:06 pm
  • I noticed that query SELECT dok.* FROM dok JOIN (SELECT DISTINCT dokumnr FROM temptbl ) x USING(dokumnr); is slow in 8.1.4 I cannot use explain analyze since this query uses results from temporary ...
    Dec 2, 2008 at 12:12 pm
    Dec 2, 2008 at 9:22 pm
  • (NOTE: I tried sending this email from my excite account and it appears to have been blocked for whatever reason. But if the message does get double posted, sorry for the inconvenience.) Hey all, ...
    Ted AllenTed Allen
    Dec 24, 2008 at 5:36 pm
    Dec 29, 2008 at 12:48 pm
  • Hello, I'm having problems with the following bad performing select-statement in a trigger-function (on update before): ... for c in select id_country, sum(cost) as sum_cost from costs where id_user ...
    Rogatzki RainerRogatzki Rainer
    Dec 4, 2008 at 1:40 pm
    Dec 5, 2008 at 3:41 pm
  • Hi everyone! I have a very large 2-column table (about 500M records) from which I want to remove duplicate records. I have tried many approaches, but they all take forever. The table's definition ...
    Kynn JonesKynn Jones
    Dec 23, 2008 at 5:25 pm
    Dec 24, 2008 at 6:56 pm
  • Hello. (Sorry, I have sent this letter to pgsql-general@ first and only then - noticed that there is a special performance mailing list. So I post it here now.) I am trying to tune PostgreSQL write ...
    Dmitry KoterovDmitry Koterov
    Dec 25, 2008 at 11:08 pm
    Jan 7, 2009 at 6:23 am
  • We have serveral table where the index size is much bigger than the table size. Example: select count(*) from product_price -- 2234244 Table size: 400 MB Index size: 600 MB After executing "reindex ...
    Laszlo NagyLaszlo Nagy
    Dec 30, 2008 at 9:06 am
    Dec 30, 2008 at 3:39 pm
  • Hi, I am looking for some recent and hopefully genuine comparisons between Oracle and PostgreSQL regarding their performance in large scale applications. Tests from real world applications would be ...
    Victor NawothnigVictor Nawothnig
    Dec 21, 2008 at 8:17 am
    Dec 22, 2008 at 3:31 am
  • Hi. I have a longish collection of SQL statements stored in a file that I run periodically via cron. Running this "script" takes a bit too long, even for a cron job, and I would like to streamline ...
    Kynn JonesKynn Jones
    Dec 3, 2008 at 7:31 pm
    Dec 4, 2008 at 12:03 am
  • Hi All, I would like to ask to you, how many connections a db server can handle. I know the question is not so easy, and actually I don't want to known a "number" but something like: - up to 100 ...
    Stefano NicheleStefano Nichele
    Dec 12, 2008 at 10:07 am
    Jan 12, 2009 at 10:08 am
  • %cat test.c #include <stdio.h int main() { while(1) { sleep(5); printf("ppid = %d\n", getppid()); } } %gcc -o test test.c %./test ppid = 47653 ppid = 47653 ppid = 47653 # Started "truss -p 48864" ...
    Laszlo NagyLaszlo Nagy
    Dec 22, 2008 at 1:57 pm
    Dec 22, 2008 at 2:00 pm
  • Hi, I am trying to restore a table out of a dump, and I get an 'out of memory' error. The table I want to restore is 5GB big. Here is the exact message : [email protected]:/home/backup-sas$ pg_restore -F ...
    Franck RoutierFranck Routier
    Dec 4, 2008 at 2:20 pm
    Dec 19, 2008 at 8:00 am
  • Hi I'm trying to compare different filesystems for postgres using pgbench. The problem I've seen is that my IO wait is very very low. Is there a way I can get pgbench to do more to push that up a ...
    Adrian MoiseyAdrian Moisey
    Dec 15, 2008 at 6:56 am
    Dec 15, 2008 at 6:09 pm
  • I have to insert rows to table with 95% primary key unique_violation. I've tested 2 examples below: 1) BEGIN INSERT INTO main (name, created) VALUES (i_name, CURRENT_TIMESTAMP AT TIME ZONE 'GMT'); ...
    Anton BogdanovitchAnton Bogdanovitch
    Dec 30, 2008 at 10:55 am
    Dec 30, 2008 at 2:51 pm
  • Hello, To improve performances, I would like to try moving the temp_tablespaces locations outside of our RAID system. Is it a good practice ? Thanks, Marc Mamin
    Marc MaminMarc Mamin
    Dec 22, 2008 at 3:12 pm
    Dec 22, 2008 at 6:07 pm
  • Hi, all! No one knows why I got "actual time=0.014..0.570 rows=30 loops=511222" and "actual time=0.005..0.006 rows=1 loops=15158976"? With: cu.cal_user_type = 'u' AND cu.cal_recur_date = ...
    Daniel Cristian CruzDaniel Cristian Cruz
    Dec 2, 2008 at 4:02 pm
    Dec 19, 2008 at 1:25 am
  • Hi, We are trying to implement slony as a replication tool for one of our database. The Insert and updates have increased by approximately double making some of our important script slow. The ...
    Nimesh SatamNimesh Satam
    Dec 17, 2008 at 4:03 am
    Dec 17, 2008 at 8:01 pm
  • I have postgresql 8.3.5 installed on MacOS X / Darwin. I remember setting shared memory buffer parameters and that solved the initial performance problem, but after running several tests, the ...
    Vincent PredoehlVincent Predoehl
    Dec 10, 2008 at 3:33 am
    Dec 10, 2008 at 3:47 am
  • Hi there, We've recently started seeing some context switch storm issues on our primary Postgres database, and I was wondering if anyone had encountered similar issues or had any ideas as to what ...
    Omar KilaniOmar Kilani
    Dec 2, 2008 at 8:51 am
    Dec 5, 2008 at 10:42 pm
  • Here is a query on a partitioned schema that produces a very bad query plan. The tables are fully vacuumed, analyzed with stats target 40, and no bloat (created with pure inserts, no updates or ...
    Scott CareyScott Carey
    Dec 21, 2008 at 8:08 pm
    Dec 21, 2008 at 8:08 pm
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75 users for December 2008

Scott Marlowe: 28 posts Tom Lane: 13 posts Scott Carey: 12 posts Joshua D. Drake: 11 posts Greg Smith: 10 posts Greg Stark: 9 posts Laszlo Nagy: 9 posts Matthew Wakeling: 9 posts Robert Haas: 9 posts Mario Weilguni: 8 posts Bricklen: 6 posts Mark Wong: 6 posts Andrus: 5 posts Merlin Moncure: 5 posts PFC: 5 posts Richard Yen: 5 posts Jaime Casanova: 4 posts Josh Berkus: 4 posts Kynn Jones: 4 posts Rogatzki Rainer: 4 posts
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