RE: SQL Server To Oracle
Date: Fri, 11 Mar 2022 12:03:43 +0000
Message-ID: <a7314d6087dd47e5ad746a1f2d8440b2_at_vontobel.com>
Jonathan,
You’re welcome.
This information is from 2019. That was the last time we used it.
Best regards,
Nenad
From: oracle-l-bounce_at_freelists.org <oracle-l-bounce_at_freelists.org> On Behalf Of Jonathan Lewis
Sent: Freitag, 11. März 2022 13:00
To: ORACLE-L <oracle-l_at_freelists.org>
Subject: Re: SQL Server To Oracle
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Nenad,
Thanks for the information..
It's been a long time since I touched Gateway - in fact it probably had a different name at the time - so I was curious to know if it had become bi-directional in the interim.
Regards
Jonathan Lewis
On Fri, 11 Mar 2022 at 10:23, Noveljic Nenad <nenad.noveljic_at_vontobel.com<mailto:nenad.noveljic_at_vontobel.com>> wrote: Jonathan,
It’s a pull from the Oracle side.
Gateway is a separate service, which can be installed on any machine. Gateway connects to the configured SQL Server database. The Gateway service is registered with a listener (not the Oracle database listener). Then, on the Oracle database you create a database link pointing to the Gateway service to select data from SQL Server.
There’s also a free Oracle Gateway for ODBC, which should also be able to connect to SQL Server, but it’s not self-contained - it requires an ODBC driver setup. In the past, I used ODBC configurations for Sybase to connect to SQL Server from Unix as they both use the same protocol (TDS).
We also tried the “push from SQL Server” approach. We created a linked server (=database link) to the Oracle database. It basically worked, but the performance was unsatisfactory for large tables. Notice that you don’t need Oracle Gateway for that approach. Oracle and ODBC Clients are sufficient.
Two things to pay attention to when migrating with Gateway for MS SQL Server:
- nvarchar(max) is mapped to long – you’d need to edit DDLs before creating affected tables.
- The table names are truncated to 30 characters.
Best regards,
Nenad
From: oracle-l-bounce_at_freelists.org<mailto:oracle-l-bounce_at_freelists.org> <oracle-l-bounce_at_freelists.org<mailto:oracle-l-bounce_at_freelists.org>> On Behalf Of Jonathan Lewis
Sent: Freitag, 11. März 2022 10:10
To: oracle-l_at_freelists.org<mailto:oracle-l_at_freelists.org>
Subject: Re: SQL Server To Oracle
Nenad,
Does that require a pull from the Oracle end, or can it do a push from the SQL Server end ?
Regards
Jonathan Lewis
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