Startup Upgrade/Migrate/Downgrade

ALTER SYSTEM ENABLE RESTRICTED SESSION;
ALTER SYSTEM SET "_SYSTEM_TRIG_ENABLED"=FALSE SCOPE=MEMORY;
ALTER SYSTEM SET JOB_QUEUE_PROCESSES=0 SCOPE=MEMORY;
ALTER SYSTEM SET AQ_TM_PROCESSES=0 SCOPE=MEMORY;
ALTER SESSION SET NLS_LENGTH_SEMANTICS=BYTE;