The name of the index. You can use this name to refer to the
    index in other statements. When choosing a name, follow these
    rules:

    o  Use a name that is unique among all index names in the
       database.

    o  Use any valid OpenVMS name. However, the name cannot end in a
       dollar sign ($) or underscore (_).

    o  Do not use any Oracle Rdb reserved words.