The SYSINDEX view is provided for compatibility with older versions of Sybase IQ that offered a SYSINDEX system table. However, the SYSINDEX system table has been replaced by the ISYSIDX system table, and its corresponding SYSIDX system view, which you should use instead.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 "SYSINDEX compatibility view (deprecated)" in SQL Anywhere Server – SQL Reference.