mirroring oracle database in pgsql

hey all,

I'm trying to convince some people here to adopt either mysql or postgresql
as a relational database here.. However, we can't start from a clean slate;
we have a very mature oracle database that applications point to right now,
and so we need a migration path. I went to the mysql folks, and it looks
like its going to be quite a while before mysql is up to the task, so I
thought I'd try pgsql.

Anyways, I was thinking of taking the following steps:

a) finding a Java API that transparently supports both postgresql and
Oracle data access and stored procedure calls.

b) instrumenting the Oracle database so that all tables support
timestamps on data rows.

c) mirroring the Oracle database in MySQL.

d) making interface code connecting the MySQL database to the
Oracle database (and both applying updates to the database
as well as data.

In other words, I'm looking to make a postgresql -> Oracle mirroring
tool, and syncing the databases on a nightly basis, and I was
wondering if anybody had experience with this sort of thing.

As I see it, if we pull this off we could save quite a bit in
licensing costs - we'd still have oracle around, but it
would only be a datastore for talking to other oracle databases,
and run by batch, not accessed by end users.

However:

a) I'm not sure how well stored procs, views, triggers and
indexes transfer over from oracle to postgresql.

b) I'm not sure how scalable postgresql is, and how well
it handles multiprocessor support (we'd be using a
six-processor box.

As an aside, how much experience do people on the list have with
enterprise db? I was thinking that they might alleviate the
mirroring headaches quite a bit, but they don't seem to have a
solaris port.. Anybody have a take on their db?

Ed

(
ps - if you subscribe to the mysql list, no you're not seeing double.
I posted a very similar message on the mysql lists a couple
of days ago..
)