Vivek Khera wrote: > And the winner is... checkpoint_segments. > > Restore of a significanly big database (~19.8GB restored) shows nearly > no time difference depending on sort_mem when checkpoint_segments is > large. There are quite a number of tables and indexes. The restore > was done from a pg_dump -Fc dump of one database. > > All tests with 16KB page size, 30k shared buffers, sort_mem=8192, PG > 7.4b2 on FreeBSD 4.8. > > 3 checkpoint_segments restore time: 14983 seconds > 50 checkpoint_segments restore time: 11537 seconds > 50 checkpoint_segments, sort_mem 131702 restore time: 11262 seconds
With the new warning about too-frequent checkpoints, people have actual feedback to encourage them to increase checkpoint_segments. One issue is that it is likely to recommend increasing checkpoint_segments during restore, even if there is no value to it being large during normal server operation. Should that be decumented? -- Bruce Momjian | http://candle.pha.pa.us [EMAIL PROTECTED] | (610) 359-1001 + If your life is a hard drive, | 13 Roberts Road + Christ can be your backup. | Newtown Square, Pennsylvania 19073 ---------------------------(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
