alter_session

alter_session 
      ::= 
      "alter" "session" 
      ( ( "set" set_session_spec { set_session_spec } ) 
      | ( "close" "database" "link" link_name ) 
      | ( "advise" ( "commit" | "rollback" | "nothing" ) ) 
      | ( ( "enable" | "disable" ) "commit" "in" "procedure" ) ) 

This rule is called by

alter_command