In response to Satish Burnwal (sburnwal) : > I have a ques - say I have a table that has 10 columns. But in a simple > select query from that table, I use just 3 columns. I want to know > whether even for fetching 3 columns, read happens for all the 10 columns > and out of that the required 3 columns are returned ? ie Does the > complete row with all the 10 columns are fetched even though I need just > 3 columns ? OR only 3 columns are fetched ?
Depends, large columns (TEXT, BYTA) are TOASTed¹, that means, the content of this columns stored in a other table. So it is always a good idea to specify all rows you needed and don't use select *. ¹ http://www.postgresql.org/docs/8.4/interactive/storage-toast.html Regards, 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-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
