restoring a shadow

In my attempts of trying to increase performance and redundancy, I
have trying to get rServ replication to work.

I have successfully been able to replicate between two databases on
localhost.

test -> Main db
test_slave -> Slave db

The 'test' database is located in PGDATA (/var/lib/pgsql/data), and
'test_slave' in PGDATA2 (/var/lib/pgsql/data2). Works fine (although
I'm a little unhappy about the replication speed).

Now, I'd like to have PGDATA in a ram disk (we're only expecting a
maximum of 10-15Mb of data). The problem is if the machine is being
reset (hardware vice) or if it crashes. Then the ram disk is
lost. This is where PGDATA2 comes into play...

I've been experimenting with renitialize the PGDATA directory
structure, and doing a

insert into pg_database values
('test_slave', 26, 0, 'f', 't', 18539, 'PGDATA2');

Also, a link from PGDATA2/base/709432 -> PGDATA/base/709432 is made
(this is what the 'original' PGDATA directory/pg_database table have).

Unfortunatly this give me:

FATAL 1: Database "test_slave" does not exist.
The database subdirectory '/var/lib/pgsql/data/base/18720' is missing.

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