[PERFORM] queries on huge tables
Title: Melding Hello all. I am having a couple of tables with couple of hundre millions records in them. Thetables containsa timestamp column. I am almost always interested in getting datas from a specific day or month. Each day contains aprox. 400.000 entries. When I do such queries as " select... from archive where m_date between '2005-01-01' and '2005-02-01' group by ... " and so on. It takes very long. I am having indexes that kicks in, but still it takes sometime. I have splitted the archive table in smaller monthly tables, it then goes a lot faster, but not fast enough. I know simular systems that uses Oracle and gains a lot on performance because of the partioning. That kind of anoyes me a bit :) Does anyone of you have some good ideas on how speed up such queries on huge tables? regards rune
[PERFORM] pg_autovacuum parameters
Title: Melding Hello all. I am managing a large database with lots of transactions in different tables. The largest tables have around 5-6 millions tuples and around 5-6 inserts and maybe 2 updates pr day. While the smalest tables have only a few tuples and a few updates /inserts pr day. In addition we have small tables with many updates/inserts. So what I am saying is that there is all kinds of tables and uses of tables in our database. This, I think, makes it difficult to set up pg_autovacuum. I am now running vacuum jobs on different tables in cron. What things should I consider when setting but base and threshold values in pg_autovacuum? Since the running of vacuum and analyze is relative to the table size, as it must be, I thinkit isdifficult to cover all tables.. Are there anyone who have some thoughts around this? Regards Rune
