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