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I have successfully split my WordPress database into two MySQL databases (using hyperDB). And it works well. Now I want to dive into the unknown and have one database use MYSQL and the other MS SQL.... is this possible?

Am I better off trying something like http://dev.mysql.com/downloads/connector/odbc/

To create a linked MySQL DB and get WordPress to connect to that.

This video makes it look pretty easy - http://www.youtube.com/watch?v=BLo1yQ_Af64?

Any thoughts greatly appreciated.

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