am 11.04.2006, um 12:15:41 +0200 mailte Alban Hertroys folgendes: > MG wrote: > >I have to improve the performance of the UPDATES and I was wondering why > >the UPDATEs need twice as long as the INSERTs. > > IIRC, an UPDATE is a DELETE/INSERT combo. That's because the original > record still needs to be visible to other existing transactions (because of > MVCC). You can't change its data but need to create a new record instead > and mark the original as obsolete. Correctly, and thats why we need VACUUM to clean the space on the disk. HTH, Andreas -- Andreas Kretschmer (Kontakt: siehe Header) Heynitz: 035242/47215, D1: 0160/7141639 GnuPG-ID 0x3FFF606C http://wwwkeys.de.pgp.net === Schollglas Unternehmensgruppe ===
