Alter system: System Management

ALTER SYSTEM CHECKPOINT GLOBAL;
ALTER SYSTEM KILL SESSION '145,334';
ALTER SYSTEM ENABLE RESTRICTED SESSION;
ALTER SYSTEM DISABLE RESTRICTED SESSION;
ALTER SYSTEM SUSPEND;
ALTER SYSTEM QUIESCE RESTRICTED;
ALTER SYSTEM UNQUIESCE;
ALTER SYSTEM RESUME;
ALTER SYSTEM FLUSH SHARED_POOL;
ALTER SYSTEM FLUSH BUFFER_CACHE;