On 12/01/2010 02:47 AM, Joshua D. Drake wrote: > On Sun, 2010-11-28 at 12:46 +0100, Mario Splivalo wrote: >> The database for monitoring certain drone statuses is quite simple: >> > >> This is the slow part: >> INSERT INTO drones_history (sample_id, drone_id, drone_log_notice, >> drone_temperature, drone_pressure) >> SELECT * FROM tmpUpdate; >> >> For 100 rows this takes around 2 seconds. For 1000 rows this takes >> around 40 seconds. For 5000 rows this takes around 5 minutes. >> For 50k rows this takes around 30 minutes! Now this is where I start lag >> because I get new CSV every 10 minutes or so. > > Have you considered making the foreign key check deferrable? > Yes, as Mladen Gogala had advised. No noticable change in performance - it's still slow :) But, just for the sake of clarification - I tought that DEFERRABLE would matter if I do a lot of INSERTs, inside a FOR loop or something like that. Since I'm doing INSERT INTO ... SELECT, does it makes any difference? Mario -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
