alter_system

alter_system 
      ::= 
      ( ( ( "enable" | "disable" ) "restricted" "session" ) 
      | ( "flush" "shared_pool" ) 
      | ( ( "checkpoint" | ( "check" "datafiles" ) ) [ "global" | "local" ] ) 
      | ( "set" system_spec { system_spec } ) 
      | ( "switch" "logfile" ) 
      | ( ( "enable" | "disable" ) "distributed" "recovery" ) 
      | ( "archive" "log" archive_log_spec ) 
      | ( "kill" "session" n "," n ) 
      ) 

This rule is called by

alter_command