Hi, from a unixODBC perspective, async should work fine, but make sure that the driver manager is not set to searialise threads, Check that Theading=0 is set in the odbcinst.ini entry for the driver. Current (2.3.x) builds of unixODBC default to this but in the past drivers were often not thread safe.
Currently in my odbcinst.ini I don't see any "Threading" field. Should I add that, If so what should be the value ?