Oracle Dropping触发器，表，索引和序列顺序

Question

我整理了一个删除触发器，表，索引和序列的脚本。

    BEGIN
/*Delete All Triggers */
FOR i in (select trigger_name,owner 
              from dba_triggers ) LOOP  
    EXECUTE IMMEDIATE 'DROP TRIGGER '||i.owner||'.'||i.trigger_name;  
  END LOOP;  
/*Delete All Indexes*/
FOR ind IN 
(SELECT index_name FROM user_indexes WHERE table_name = 'my_table' AND index_name NOT IN 
   (SELECT unique index_name FROM user_constraints WHERE 
      table_name = 'my_table' AND index_name IS NOT NULL))
LOOP
  execute immediate 'DROP INDEX '||ind.index_name;
END LOOP;
/*Delete All Tables*/
FOR c IN (SELECT table_name FROM user_tables) LOOP
EXECUTE IMMEDIATE ('DROP TABLE ' || c.table_name || ' CASCADE CONSTRAINTS');
END LOOP;
/*Delete all Sequences*/
FOR s IN (SELECT sequence_name FROM user_sequences) LOOP
EXECUTE IMMEDIATE ('DROP SEQUENCE ' || s.sequence_name);
END LOOP;

END;

我想知道是否有特定的顺序我应该这样做？还有什么我需要考虑的吗？