1-max amount of available storage data.
How many hard disks can you buy ?
2-Clustering support.
Please be more precise.
3-price.
Free.
4-speed.
Proportional to the expertise of the DBA.
Postgres can be extremely fast if used correctly, it can totally suck if
the database is badly designed.
But this is completely normal. It is as fast as the other major players,
and all of them need expertise to work well.
If you're a newbie, you'll make newbie errors, fortunately this list has
many friendly & knowledgeable people who can help you, and the docs are
excellent.
THIS EMAIL AND ANY ATTACHED FILES ARE CONFIDENTIAL.
Aw. Come on.