oracle生成千百万级测试数据

INSERT INTO CHINABONDSVARANDCVAR
SELECT
ROWNUM AS ID , --ID
to_char(SYSDATE +ROWNUM,‘yyyymmdd’) AS calcdate, --VARCHAR2(8) DATE
dbms_random.string(‘x’,20) AS secode ,
dbms_random.string(‘x’,20) AS symbol , --VARCHAR2(20)
dbms_random.string(‘x’,10) AS EXCHANGE , --VARCHAR2(10)
dbms_random.string(‘x’,10) AS circulplace,
dbms_random.value(0,200) AS holdperiod ,
dbms_random.value(0,200) ASconfidence ,
dbms_random.value(0,200) AS fvar ,
dbms_random.value(0,200) AS fcvar ,
dbms_random.value(0,200) AS isvalid , --NUMBER(12,6) ,INT,INTEGER
–to_timestamp(SYSDATE + ROWNUM/24/3600,‘dd-mm-yyyy hh24:mi:ss’) AS tmstamp , – TIMESTAMP(6)
SYSDATE + ROWNUM/24/3600 AS tmstamp ,–DATE
SYSDATE + ROWNUM AS entrydate , --DATE
to_char(SYSDATE +ROWNUM,‘yyyymmdd’) AS entrytime --VARCHAR2(8) DATE
FROM dual
CONNECT BY LEVEL <=1000000;