vsession 是记录回话信息的，具体sql执行情况查看vsql

1.创建一个表来存储操作日志

create table trig_sql(
LT DATE not null primary key,
SID NUMBER,
　 SERIAL# NUMBER,
USERNAME VARCHAR2(30),
OSUSER VARCHAR2(64),
MACHINE VARCHAR2(32),
TERMINAL VARCHAR2(16),
PROGRAM VARCHAR2(64),
SQLTEXT VARCHAR2(2000),
STATUS VARCHAR2(30),
CLIENT_IP VARCHAR2(60),
);
2.创建索引（可能已经自动创建，如果已经创建则忽略此步骤）

create index idx_time on trig_sql (LT);
3.创建触发器
IN_FIRST_PAGE_OTHER：我们要监控的表

create or replace trigger pri_test
after insert or update or delete on IN_FIRST_PAGE_OTHER for each row
DECLARE
PRAGMA AUTONOMOUS_TRANSACTION;
BEGIN
IF inserting THEN
INSERT INTO trig_sql
select sysdate,s.SID, s.SERIAL#, s.USERNAME, s.OSUSER,
s.MACHINE, s.TERMINAL, s.PROGRAM, q.sql_text line,
‘INSERT’,
sys_context(‘userenv’,‘ip_address’)
from v$sql q, v$session s
where s.audsid=(select userenv(‘SESSIONID’) from dual)
and s.prev_sql_addr=q.address
AND s.PREV_HASH_VALUE = q.hash_value;
COMMIT;
ELSIF deleting then
INSERT INTO trig_sql
select sysdate,s.SID, s.SERIAL#, s.USERNAME, s.OSUSER,
s.MACHINE, s.TERMINAL, s.PROGRAM, q.sql_text line,
‘DELETE’,
sys_context(‘userenv’,‘ip_address’)
from v$sql q, v$session s
where s.audsid=(select userenv(‘SESSIONID’) from dual)
and s.prev_sql_addr=q.address
AND s.PREV_HASH_VALUE = q.hash_value;
COMMIT;
ELSIF updating then
INSERT INTO trig_sql
select sysdate,s.SID, s.SERIAL#, s.USERNAME, s.OSUSER,
s.MACHINE, s.TERMINAL, s.PROGRAM, q.sql_text line,
‘UPDATE’,
sys_context(‘userenv’,‘ip_address’)
from v$sql q, v$session s
where s.audsid=(select userenv(‘SESSIONID’) from dual)
and s.prev_sql_addr=q.address
AND s.PREV_HASH_VALUE = q.hash_value;
COMMIT;
END IF;
END;
4.测试时
update scott.dept set 表字段修改
发现vsql找得到语句，但是vsession没找到。
发现下面两个字段关联，查询不出来。
select *
from v$sql q, v$session s
and s.prev_sql_addr=q.address
AND s.PREV_HASH_VALUE = q.hash_value