Re: [PERFORM] Postgresql works too slow
On Mon, 2005-04-18 at 08:50 +0400, Nurlan Mukhanov (AL/EKZ) wrote: I'm trying to restore my database from dump in several parrallel processes, but restore process works too slow. Number of rows about 100 000 000, RAM: 8192M CPU: Ultra Sparc 3 Number of CPU: 4 OS: SunOS sun 5.8 RDBMS: PostgreSQL 8.0 How to encrease postgresql speed? Why postgres took only 5.0% of CPU time? When you say restore...what are you actually doing? An archive recovery? A reload? A file-level restore of database? Best Regards, Simon Riggs ---(end of broadcast)--- TIP 7: don't forget to increase your free space map settings
Re: [PERFORM] Postgresql works too slow
Simon Riggs wrote: On Mon, 2005-04-18 at 08:50 +0400, Nurlan Mukhanov (AL/EKZ) wrote: I'm trying to restore my database from dump in several parrallel processes, but restore process works too slow. Number of rows about 100 000 000, RAM: 8192M CPU: Ultra Sparc 3 Number of CPU: 4 OS: SunOS sun 5.8 RDBMS: PostgreSQL 8.0 How to encrease postgresql speed? Why postgres took only 5.0% of CPU time? When you say restore...what are you actually doing? An archive recovery? A reload? A file-level restore of database? If you are doing a restore off a pg_dump, did you dump the data as inserts? This takes a lot more time to restore. -- Brad Nicholson 416-673-4106 Database Administrator, Afilias Canada Corp. ---(end of broadcast)--- TIP 8: explain analyze is your friend
Re: [PERFORM] Postgresql works too slow
Steve Poe [EMAIL PROTECTED] writes: Try enabliing your checkpoint_segments. In my example, our database restore took 75mins. After enabling checkpoints_segments to 20, we cut it down to less than 30 minutes. Increasing maintenance_work_mem might help too ... or several other settings ... with no information about exactly *what* is slow, it's hard to say. regards, tom lane ---(end of broadcast)--- TIP 3: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly
Re: [PERFORM] Postgresql works too slow
Try enabliing your checkpoint_segments. In my example, our database restore took 75mins. After enabling checkpoints_segments to 20, we cut it down to less than 30 minutes. Increasing maintenance_work_mem might help too ... or several other settings ... with no information about exactly *what* is slow, it's hard to say. Try turning fsync = false for the duration of your reload. Chris ---(end of broadcast)--- TIP 7: don't forget to increase your free space map settings
Re: [PERFORM] Postgresql works too slow
Nurlan, Try enabliing your checkpoint_segments. In my example, our database restore took 75mins. After enabling checkpoints_segments to 20, we cut it down to less than 30 minutes. Is your pg_xlog on a seperate disc..or at least a partition? This will help too. A checkpoints_segments of 20, if memory serves correctly, will occupy around 800-900M of disc space in pg_xlog. Steve Poe Nurlan Mukhanov (AL/EKZ) wrote: Hello. I'm trying to restore my database from dump in several parrallel processes, but restore process works too slow. Number of rows about 100 000 000, RAM: 8192M CPU: Ultra Sparc 3 Number of CPU: 4 OS: SunOS sun 5.8 RDBMS: PostgreSQL 8.0 prstat info PID USERNAME SIZE RSS STATE PRI NICE TIME CPU PROCESS/NLWP 14231 postgres 41M 37M sleep 580 0:00.01 0.2% postgres/1 14136 postgres 41M 37M sleep 580 0:00.03 0.2% postgres/1 14211 postgres 41M 37M sleep 580 0:00.01 0.2% postgres/1 14270 postgres 41M 37M sleep 580 0:00.00 0.2% postgres/1 13767 postgres 41M 37M sleep 580 0:00.18 0.2% postgres/1 13684 postgres 41M 36M sleep 580 0:00.14 0.2% postgres/1 NPROC USERNAME SIZE RSS MEMORY TIME CPU 74 root 272M 191M 2.3% 0:26.29 24% 124 postgres 1520M 1306M16% 0:03.05 5.0% How to encrease postgresql speed? Why postgres took only 5.0% of CPU time? Nurlan Mukhanov ---(end of broadcast)--- TIP 1: subscribe and unsubscribe commands go to [EMAIL PROTECTED] ---(end of broadcast)--- TIP 6: Have you searched our list archives? http://archives.postgresql.org
