On 10/16/2012 03:50 PM, Sylvain CAILLET wrote: > Hi to all, > > I've got a trouble with some delete statements. My db contains a little > more than 10000 tables and runs on a dedicated server (Debian 6 - bi > quad - 16Gb - SAS disks raid 0). Most of the tables contains between 2 > and 3 million rows and no foreign keys exist between them. Each is > indexed (btree) on start_date / end_date fields (bigint). The Postgresql > server has been tuned (I can give modified values if needed). > > I perform recurrent DELETE upon a table subset (~1900 tables) and each > time, I delete a few lines (between 0 and 1200). Usually it takes > between 10s and more than 2mn. It seems to me to be a huge amount of > time ! An EXPLAIN ANALYZE on a DELETE shows me that the planner uses a > Seq Scan instead of an Index Scan.
Can you post that (or paste to explain.depesz.com and link to it here) along with a "\d tablename" from psql?