From: Laurenz Albe <laurenz.albe@cybertec.at>
To: Pepe TD Vo <pepevo@yahoo.com>
To: pgsql-admin@lists.postgresql.org, Thomas Kellerer <shammat@gmx.net>
Subject: Re: Exporting TBs of data in Oracle schema/database into CSV format to migrate into PostgreSQL
Date: Mon, 20 Apr 2020 16:39:39 +0200
Message-ID: <ee5a27d790ac43d4358b6353f37d09eee4214bbf.camel@cybertec.at> (raw)
In-Reply-To: <172687860.2288957.1587391373846@mail.yahoo.com>
References: <CAOLrvP6sSTH2Mq5q29-9Jdk3JrR-PGT5WE+eN=8xnqKg8vnvbw@mail.gmail.com>
<c5b9987a-ad9e-ce37-d734-2fb38d1d7330@gmx.net>
<172687860.2288957.1587391373846@mail.yahoo.com>
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
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To: pgsql-admin@postgresql.org
Cc: laurenz.albe@cybertec.at, pepevo@yahoo.com, shammat@gmx.net
Subject: Re: Exporting TBs of data in Oracle schema/database into CSV format to migrate into PostgreSQL
In-Reply-To: <ee5a27d790ac43d4358b6353f37d09eee4214bbf.camel@cybertec.at>
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