In response to Waldomiro : > I?m thinking It hapens because in the 7 millions tables, the same 8k > block has diferent records with different keys, so only a few records > with 'my_key' is retrieved when I read a 8k block. > In the part_table, all records stored in a 8k block have 'my_key', so > It?s much optimized. > > My doubt, there is a way to defrag my 7 millions table to put all > records with the same key in the same 8k block? > > How can I do that? CLUSTER your table: http://www.postgresql.org/docs/current/static/sql-cluster.html Andreas -- Andreas Kretschmer Kontakt: Heynitz: 035242/47150, D1: 0160/7141639 (mehr: -> Header) GnuPG: 0x31720C99, 1006 CCB4 A326 1D42 6431 2EB0 389D 1DC2 3172 0C99 -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
