Thanks a lot for all people which answer. I have this "clustering on SAN" problem today and i think it could be less harder to implement this today than it was for Oracle in 1993 (since i can find a lot of work in opensource which could be interesting in this project : distributed lock, clustered shared memory, etc ...).
I will try to have a look about all these things btw, i haven't got the pretention to suceed to do anything ... Just look and see a bit more deeply how it could be hard. Is there something like a "big picture" about postgres internal ? What path is used from the SQL query to the hard-disk files ? About the internal locking mechanism ? about the usage of the shared memory ? I see there is everything described in the postgres doc but no "big picture" which could help me to understand faster ... :( I'm using postgres for several year and i have nerver problem with it i'm really happy with these trigger and inheritance mechanism which help me more than one time and i would present my respect to those guy which write this so good piece of software. I hope to see you later with something to show ... Sincerly, Yannick. ---------------------------(end of broadcast)--------------------------- TIP 2: you can get off all lists at once with the unregister command (send "unregister YourEmailAddressHere" to [EMAIL PROTECTED])