I tried maxpages = 0 and full_page_writes=off and it seemed to be taking forever. All other tricks I have already tried. At this point I wondering if its a jdbc client side issue - I am using the latest 8.1. (as I said in an earlier post - I am using addBatch with batch size of 100). But just in case - I am missing something. If 17k record/sec is right around expected then I must say I am little disappointed from the "most advanced open source database". thanks for all your help. -Sanjay Merlin Moncure-2 wrote: > > On 3/15/07, femski <hypertree@xxxxxxxxx> wrote: > well, what sql is the jdbc driver creating exactly? It is probably > running inserts in a transaction. your load is about 17k inserts/sec > which about right for postgres on your hardware. you have the > following options to play increase insert performance: > > * tweak postgresql.conf > fsync: off it is not already > wal_segments: bump to at least 24 or so > maintenance_work_mem: if you create key after insert, bump this high > (it speeds create index) > bgwriter settings: you can play with these, try disabling bgwriter > first (maxpages=0) > full_page_writes=off might help, not 100% sure about this > > * distribute load > make load app multi thrreaded. > > * use copy for bulk load > [is there a way to make jdbc driver do this?] > > * use multi-line inserts (at least 10 rows/insert)...nearly as fast as > copy > > * if jdbc driver is not already doing so, prepare your statements and > execute. > > merlin > > ---------------------------(end of broadcast)--------------------------- > TIP 1: if posting/reading through Usenet, please send an appropriate > subscribe-nomail command to majordomo@xxxxxxxxxxxxxx so that your > message can get through to the mailing list cleanly > > -- View this message in context: http://www.nabble.com/Postgres-batch-write-very-slow---what-to-do-tf3395195.html#a9492938 Sent from the PostgreSQL - performance mailing list archive at Nabble.com.
