常用SQL性能统计代码

 1 BEGIN
     DBMS_STATS.GATHER_TABLE_STATS(OWNNAME=> 'TELEDB', TABNAME=> 'WFGTEST', PARTNAME=> NULL);
 END;
 ALTER   TABLE  WFGTEST  DEALLOCATE   UNUSED ;
 COMMIT;

 SELECT TABLE_NAME,NUM_ROWS,BLOCKS,EMPTY_BLOCKS
 FROM USER_TABLES
 WHERE TABLE_NAME='WFGTEST';

 SELECT COUNT() FROM WFGTEST;

 DELETE FROM WFGTEST;
 COMMIT;

 TRUNCATE TABLE WFGTEST;
 COMMIT;

 SELECT *FROM WFGTEST;

 DECLARE
     NUM NUMBER();
     DT1 DATE;
 BEGIN
     NUM :=;
     DT1 := SYSDATE();
     FOR NUM IN  ..
     LOOP
         INSERT INTO WFGTEST VALUES(TO_CHAR(NUM),TO_CHAR(NUM),NUM);
     END LOOP;
 COMMIT;

 DBMS_OUTPUT.PUT_LINE(FLOOR(TO_NUMBER(SYSDATE-DT1)***));

 END ;