Displays whether or not identifier checking is enabled. You must
    enclose reserved words from the ANSI/ISO SQL standard within
    double quotation marks to supply them as identifiers in SQL
    statements. When you enable identifier checking, SQL issues
    an informational message after statements that misuse ANSI/ISO
    reserved words. For a list of the reserved words, see Oracle Rdb
    SQL Reference Manual.

    By default, identifier checking is disabled. To enable it, use
    the SET KEYWORD RULES statement.