The SYSINDEX view is provided for compatibility with older versions of Sybase IQ that offered a SYSINDEX system table.
The SYSINDEX system table has been replaced by the ISYSIDX system table, and its corresponding SYSIDX system view, which you should use instead.
The SYSINDEX view is a SQL Anywhere compatibility view. See SQL Anywhere 11.0.1 > SQL Anywhere Server - SQL Reference > System Objects > Views > Compatibility views > SYSINDEX compatibility view (deprecated).