使用触发器来监控表的使用情况

监控表的使用有那么几种方式
1.    审计,10g的颗粒度已经很细了,磁盘空间是个问题.
2.    还有就是查看 FLASHBACK_TRANSACTION_QUERY,但是这个与undo_retention以及undo大小有关系,表大的话,查这个很费劲.
3.    再来就是触发器,高并发的情况下要谨慎使用.

闲话不多说,做个用触发器监控数据表使用的例子.
先建立测试表.

create table TGLOG
(
  USERCODE VARCHAR2(25) not null,
  TIME     DATE not null,
  TYPE     VARCHAR2(25) not null,
  IP       VARCHAR2(25) not null,
  RAMARK1  VARCHAR2(25) not null,
  REMARK2  VARCHAR2(225)
);

create table TGTEST
(
  USERCODE    VARCHAR2(10) not null,
  LMAGENTID   VARCHAR2(25) not null,
  REMARK      VARCHAR2(225),
  VALIDSTATUS VARCHAR2(1) not null,
  FLAG        VARCHAR2(1)
);

目标:对TGTEST的inser,update,delete  都记录下相应信息
(操作类型,username,timestamp,ip,machine,module),并且只跟踪usercode='0000000000'的数据.

CREATE OR REPLACE TRIGGER tg_trace_tab_tgtest
AFTER UPDATE or delete or insert ON TGTEST 
REFERENCING NEW AS New OLD AS Old
FOR EACH ROW
DECLARE 
v_type VARCHAR2(500);
old_value int;
new_value int;
BEGIN
  v_type:='';
  
  old_value:=:old.usercode; 
  new_value:=:new.usercode;
  
  if(old_value='0000000000' or new_value='0000000000') then 
  
    IF inserting THEN
       v_type:='INSERT';
    ELSIF updating THEN
       v_type:='UPDATE';
    ELSIF deleting THEN
       v_type:='DELETE';
    END IF;
    INSERT INTO tglog
    select username,sysdate,v_type,SYS_CONTEXT('USERENV','IP_ADDRESS'),machine,program
      from v$session where AUDSID = USERENV('SESSIONID');
  end if;

END;
/

OK,可以开始测试了.

INSERT INTO tgtest SELECT '0000000000','22','333','1','1' FROM dual ; 
COMMIT ;
UPDATE tgtest SET flag=0 WHERE usercode='0000000000';
COMMIT ;
DELETE FROM tgtest WHERE usercode='0000000000';
COMMIT;

SELECT * FROM tglog ORDER BY TIME ASC ;

USERCODE   TIME                TYPE       IP                        RAMARK1                   REMARK2
---------- ------------------- ---------- ------------------------- ------------------------- --------------------
FUDB       2010-07-22 17:20:20 111        192.168.3.188             MSHOME\TPADGERRARD        plsqldev.exe
FUDB       2010-07-22 17:38:34 INSERT     192.168.3.188             MSHOME\TPADGERRARD        plsqldev.exe
FUDB       2010-07-22 17:38:59 INSERT     192.168.3.188             MSHOME\TPADGERRARD        plsqldev.exe
FUDB       2010-07-22 17:39:34 INSERT     192.168.3.188             MSHOME\TPADGERRARD        plsqldev.exe
FUDB       2010-07-22 17:41:03 UPDATE     192.168.3.188             MSHOME\TPADGERRARD        plsqldev.exe
FUDB       2010-07-22 21:15:20 DELETE     192.168.3.188             MSHOME\TPADGERRARD        plsqldev.exe
FUDB       2010-07-22 21:15:56 INSERT     192.168.3.188             MSHOME\TPADGERRARD        plsqldev.exe
FUDB       2010-07-22 21:16:40 DELETE     192.168.3.188             MSHOME\TPADGERRARD        plsqldev.exe
FUDB       2010-07-22 21:32:20 INSERT     192.168.3.49              WORKGROUP\MESORACLE       sqlplus.exe