建议,可能还有其他的方法？

create table COUNTRIES (
  COUNTRY_ID   VARCHAR2(7),COUNTRY_NAME VARCHAR2(40),constraint COUNTRY_C_ID_PK primary key (COUNTRY_ID)
);
 
 
Begin
For IDS in 1..1000000
Loop
INSERT INTO "SYSTEM"."COUNTRIES" (COUNTRY_ID,COUNTRY_NAME) VALUES (dbms_random.string('L',7),dbms_random.string('L',15));
Commit;
End loop;
End;