RE: Oracle 11g to PostgreSQL 10 - Database Migration

Okay Thanks Mariel.

From: Mariel Cherkassky <mariel(dot)cherkassky(at)gmail(dot)com>
Sent: Tuesday, August 14, 2018 5:27 PM
To: Bhattacharjee, Soumik <soumik(dot)bhattacharjee(at)kpn(dot)com>
Cc: pgsql-admin <pgsql-admin(at)postgresql(dot)org>
Subject: Re: Oracle 11g to PostgreSQL 10 - Database Migration

Well like I said it depends on your oracle`s database structure(the logical structure - tables,tablespace and so on..) and on the migration tool that you will use. If the database are small maybe consider using oracle_fdw to the oracle`s tables for the deltas. I didnt search online but maybe there is a tool that can manage logical replication between oracle and postgresql and that might help you.

2018-08-14 14:53 GMT+03:00 <soumik(dot)bhattacharjee(at)kpn(dot)com<mailto:soumik(dot)bhattacharjee(at)kpn(dot)com>>:
Thanks Mariel.

Also if any help on moving the delta part post migration process , any tools which is intelligent enough to identify the delta part.

There will be a period of 3 days between Migration and Cutover(Delta)

Thanks
Soumik

From: Mariel Cherkassky <mariel(dot)cherkassky(at)gmail(dot)com<mailto:mariel(dot)cherkassky(at)gmail(dot)com>>
Sent: Tuesday, August 14, 2018 5:06 PM
To: Bhattacharjee, Soumik <soumik(dot)bhattacharjee(at)kpn(dot)com<mailto:soumik(dot)bhattacharjee(at)kpn(dot)com>>
Cc: pgsql-admin <pgsql-admin(at)postgresql(dot)org<mailto:pgsql-admin(at)postgresql(dot)org>>
Subject: Re: Oracle 11g to PostgreSQL 10 - Database Migration

Hi,
It is very depends on the structure of your database. Before starting try to know everything about your database - schemas, object types and so on.. Ora2pg is a great tool but sometimes isnt enough for all migrations. Check out oracle_fdw("dblink" to oracle database) and orafce (oracle internal functions for postgresql).

2018-08-14 14:22 GMT+03:00 <soumik(dot)bhattacharjee(at)kpn(dot)com<mailto:soumik(dot)bhattacharjee(at)kpn(dot)com>>:
Hello All,

We have a requirement to migrate from Oracle(Multiple versions) – 11gR1,11gR2,12c to PostgreSQL 10 to private cloud of customer in context to that –

1. Please let me know the best practices for migrations- any documents ,links etc.

2. Open source tools for migration.

3. OS and kernel parameters as per PostgreSQL standards for DB instances.

4. Design and planning for PostgreSQL configurations.

5. If Ora2pg tool is enough for migration?

Thanks
Soumik