Configure your broker environment to globally coordinate message flow transactions with updates in Sybase databases under the control of a 64-bit queue manager.
All WebSphere® MQ Version 6 queue managers on 64-bit platforms run in 64-bit mode. 64-bit queue managers can coordinate transactions only in 64-bit mode. If the broker uses a 64-bit queue manager, you can globally coordinate message flows that are deployed to either 64-bit or 32-bit execution groups, but if you are using 32-bit execution groups, you must define the data source name of the user database in both odbc.ini and odbc64.ini. If the broker uses a 64-bit queue manager, or has a 64-bit execution group, the databases to which the broker connects must also be 64-bit mode.