清除数据字典里的内容：
SQL> begin
2 dbms_service.delete_service(service_name=>'dmm');
3 end;
4 /
PL/SQL procedure successfully completed.
再次查询数据字典，没有了数据。清除完成
SQL> select name,failover_method,failover_type,goal,clb_goal from dba_services;
NAME FAILOVER_METHOD FAILOVER_TYPE GOAL CLB_G
-------------------- --------------- ----------------------- -----
SYS$BACKGROUND NONE SHORT
SYS$USERS NONE SHORT
seeddataXDB LONG
seeddata.regress.rdb LONG
rawXDB LONG
raw LONG