[ADMIN] Oracle to Postgres conversion suggestions?

Hi,

I've been asked to help with one of these. I'm a bit wary, as I'm
thinking this is actually a really high risk endeavor. Any thoughts on
toolkits that might make this easy?


details:

- db size approx 5TB

- blob and (Oracle) spatial datatypes involved

- conversion and heterogeneous replication solutions needed


Currently looking at Amazon schema conversion/data migration services
but wondering if there are known good solutions out there!


Cheers


Mark