???? Laimutis , what do you means "understanding PostgreSQL as well as Firebird have some serious issues with that(MVCC)" ? I do not know Firebird, but PG (I am talking about PG version >8.0) has no issues with MVCC (yes, it depends waht do you qualify as issue....). In PG you get absolutely the same MVCC as Oracle . The underlying implementation is totally diffrent, though (table inlibe undo segments). Best Regrads. Milen -----Original Message----- From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Laimutis Nedzinskas Sent: Wednesday, February 21, 2007 7:19 PM To: oracle-l@xxxxxxxxxxxxx Subject: RE: EnterpriseDB As far as I understand the real issue about RDBMS performance is how(and if) they implement MVCC (multi version concurency control) From my understanding PostgreSQL as well as Firebird have some serious issues with that. Which is not the case with innoDB of MySQL, haven´t they ? _____ From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Richard J. Goulet Agree, I was asked to "pick my own poison" from the open source world a few years ago, before EnterpriseDB exited. If you are going to use an open source db I'd highly recommend PostGreSql over ALL of the other offerings out there, particularly MySql. Fyrirvari/Disclaimer <http://www.landsbanki.is/disclaimer> http://www.landsbanki.is/disclaimer