常用SQL性能统计代码

 1 BEGIN
 2     DBMS_STATS.GATHER_TABLE_STATS(OWNNAME=> ‘TELEDB‘, TABNAME=> ‘WFGTEST‘, PARTNAME=> NULL);
 3 END;
 4 ALTER   TABLE  WFGTEST  DEALLOCATE   UNUSED ;
 5 COMMIT;
 6
 7 SELECT TABLE_NAME,NUM_ROWS,BLOCKS,EMPTY_BLOCKS
 8 FROM USER_TABLES
 9 WHERE TABLE_NAME=‘WFGTEST‘;
10
11 SELECT COUNT(1) FROM WFGTEST;
12
13 DELETE FROM WFGTEST;
14 COMMIT;
15
16 TRUNCATE TABLE WFGTEST;
17 COMMIT;
18
19 SELECT *FROM WFGTEST;
20
21 DECLARE
22     NUM NUMBER(20);
23     DT1 DATE;
24 BEGIN
25     NUM :=1;
26     DT1 := SYSDATE();
27     FOR NUM IN 1 .. 1000000
28     LOOP
29         INSERT INTO WFGTEST VALUES(TO_CHAR(NUM),TO_CHAR(NUM),NUM);
30     END LOOP;
31 COMMIT;
32
33 DBMS_OUTPUT.PUT_LINE(FLOOR(TO_NUMBER(SYSDATE-DT1)*24*60*60));
34
35 END ;