ALTER SYSTEM  
{ archive_log_clause 
| CHECKPOINT [ GLOBAL | LOCAL ]
| CHECK DATAFILES [ GLOBAL | LOCAL ]  
| { ENABLE | DISABLE } DISTRIBUTED RECOVERY 
| { ENABLE | DISABLE } RESTRICTED SESSION 
| FLUSH SHARED_POOL 
| end_session_clauses 
| SWITCH LOGFILE
| { SUSPEND | RESUME }
| { QUIESCE RESTRICTED | UNQUIESCE }
| SHUTDOWN [IMMEDIATE] dispatcher_name
| REGISTER
| SET alter_system_set_clause [, alter_system_set_clause]...
| RESET alter_system_reset_clause [, alter_system_reset_clause]...
}
;