So far, we have seen how the most important advanced SQL features can be ported or used in PostgreSQL. Given this introduction, it is time to take a look at migrating Oracle database systems in particular.
These days, migrating from Oracle to PostgreSQL has become really popular due to Oracle's new license and business policy. Around the world, people are moving away from Oracle and adopting PostgreSQL.
Using the oracle_fdw extension to move data
One of my preferred methods to move users from Oracle to PostgreSQL is Laurenz Albe's oracle_fdw extension (https://github.com/laurenz/oracle_fdw). It is a Foreign Data Wrapper (FDW) that allows you to represent a table in Oracle as a table in PostgreSQL. The oracle_fdw extension is one of the most sophisticated FDWs and is rock solid, well documented, free, and open source.
Installing the oracle_fdw extension requires you to install the Oracle client library. Fortunately, there are already RPM packages...
