On Thu, Feb 22, 2007 at 07:11:42PM +0100, Gabriel Biberian wrote: > Create a new DB and load a dump of the above database with 976009 rows, > then i perform updates on the whole table. I recorded the time taken > for each full update and the amount of extra disk space used. Each > consecutive update of the table is slower than the previous > beebox@evobrik01:~$ time psql TOTO -c "UPDATE versions_9d SET flag=2" > UPDATE 976009 > real 0m41.542s You're creating a huge amount of dead rows by this kind of procedure. Try a VACUUM in-between, or enable autovacuum. (Adjusting your WAL and checkpointing settings might help too.) Apart from that, do you really have a scenario that requires updating _all_ rows in your table regularly? /* Steinar */ -- Homepage: http://www.sesse.net/
