How to query data from Oracle, MySQL, and MSSQL?

For an environment consisting of Oracle 11g/12c enterprise edition, MySQL 5.7 community edition, and MSSQL 2008/2012 stanard/enterprise edition, is there any major issue using DG4ODBC to query data from all 3 platforms?
Is there other free alternatives?
If the queried data is mostly contained in MySQL or MSSQL, will it be more efficient to query from MySQL or MSSQL?
If yes, any suggestion of how to do it in those platforms? I know MSSQL can use linked server but it is quite slow.

mkirtley-Oracle wrote:
Hi Ed,
It is semantics. By multiple instances I mean you have the gateway installed in an ORACLE_HOME which has 1 listener. However, if you are connecting to different non-Oracle databases or different individual databases of that non-Oracle database then you need multiple gateway instances for each database being connected. I did not mean that you need a gateway installed in a separate ORACLE_HOME for each non-Oracle database to which you are connecting.
Each of these would have a separate instance file within that ORACLE_HOME/hs/admin directory with the connection details for the non-Oracle database to which that instance connects.. So, you would have -
initgtw1.ora - connects to MySQL
initgtw2.ora - connect to SQL*Server northwind database
initgtw3.ora - connect to SQL*Server test database
etc
etc
Each of these instances would have a separate entry in the gateway listener.ora.
In MOS have a look at this note -
How To Add A New Database or Destination To An Existing Gateway Configuration (Doc ID 1304573.1)
Regards,
Mike
Ah yes, we are in agreement, it was just semantics. Thanks.

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