After you install Sybase IQ , perform these steps before you upgrade your existing Sybase IQ database to version 15.4.
Drop and recreate all Sybase IQ 15.2 GA TEXT indexes that have not already been dropped and recreated as part of a version 15.2 ESD upgrade. TEXT indexes created in Sybase IQ 15.2 GA are not compatible with later versions of Sybase IQ.