Syntax options:

       connect-string-literal
       connect-parameter
       connect-parameter-marker

 Specifies the database environment. You can supply a parameter
 marker from dynamic SQL, a host language variable from a precompiled
 SQL program, a parameter from an SQL module language module, or a
 string literal. The argument that you supply must be a character
 string that contains a connect expression that is interpreted at run
 time.