Open DB in RO

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CREATE OR REPLACE TRIGGER
   manage_service
after startup on database
DECLARE
   role VARCHAR(30);
BEGIN
   SELECT DATABASE_ROLE INTO role FROM V$DATABASE;
   IF role = 'PRIMARY' THEN
      DBMS_SERVICE.START_SERVICE('sales_rw');
   ELSE
      DBMS_SERVICE.START_SERVICE('sales_ro');
END IF;
END;