Re: Exporting TBs of data in Oracle schema/database into CSV formatto migrate into PostgreSQL

On Mon, 2020-04-20 at 14:02 +0000, Pepe TD Vo wrote:
> we can access Oracle table within Postgres?  How?  Need to create a database link
> and/or how can both talk to each other?

That would be the Oracle foreign data wrapper:
https://laurenz.github.io/oracle_fdw/

> My data is from production, can turn off the foreign key.  Is there a way to copy
> data from Oracle to Postgres faster?  Should I export the Oracle data table via
> dump file as text/csv and insert it into Postgres?  Can we use an oracle dump file?

You cannot use an Oracle dump, because that is in a proprietary format.

Using the foreign data wrapper, you define a foreign table in PostgreSQL.
When you select from that table, the data are directly fetched from Oracle.

Then you can do

   INSERT INTO localtable SELECT * FROM foreign_table;

to transfer the data, without any intermediary file storage.
In a way, the data are streamed from Oracle to PostgreSQL.

Yours,
Laurenz Albe
--
Cybertec | https://www.cybertec-postgresql.com