Oracle最强有力的辅助诊断工具SQL_TRACE（3）
3．对其他用户session设置通过DBMS_SYSTEM.SET_EV系统包来实现:
SQL> desc dbms_system
...
PROCEDURE SET_EV
Argument Name Type In/Out Default?
--------------- ----------------------- ------ --------
SI BINARY_INTEGER IN
SE BINARY_INTEGER IN
EV BINARY_INTEGER IN
LE BINARY_INTEGER IN
NM VARCHAR2 IN
...
其中的参数SI、SE来自v$session视图。
查询获得需要跟踪的session信息:
SQL> select sid,serial#,username from v$session
where username is not null;SID SERIAL# USERNAME
---------- ---------- ----------------------
8 2041 SYS
9 437 EYGLE
执行跟踪:
SQL> exec dbms_system.set_ev(9,437,10046,8,'eygle');
PL/SQL procedure successfully completed.
结束跟踪:
SQL> exec dbms_system.set_ev(9,437,10046,0,'eygle');
PL/SQL procedure successfully completed.
获取跟踪文件
上面生成的跟踪文件位于user_dump_dest目录中，位置及文件名可以通过下面的SQL查询得到:
SQL> select2 d.value||'/'||lower(rtrim(i.instance,
chr(0)))||'_ora_'||p.spid||'.trc' trace_file_name3
from4 ( select p.spid5 from sys.v$mystat m,
sys.v$session s,sys.v$process p6
where m.statistic# = 1 and s.sid = m.sid and p.addr = s.paddr) p,
7 ( select t.instance from sys.v$threadt,sys.v$parameter
v8 where v.name = 'thread' and
(v.value = 0 or t.thread# = to_number(v.value))) i,9
( select value from sys.v$parameter
where name = 'user_dump_dest') d 10/
TRACE_FILE_NAME
----------------------------
/opt/oracle/admin/hsjf/udump/hsjf_ora_1026.trc
读取当前session所设置的参数
假如我们通过alter session的方式设置了sql_trace,此设置在正常情况下是不能通过show parameter方式获取的,需要我们通过dbms_system.read_ev来获取：
SQL> set feedback offSQL> set serveroutput on SQL> declare
2 event_level number;
3 begin
4 for event_number in 10000..10999 loop
5 sys.dbms_system.read_ev(event_number, event_level);
6 if (event_level > 0) then
7 sys.dbms_output.put_line(
8 'Event ' ||
9 to_char(event_number) ||
10 ' is set at level ' ||
11 to_char(event_level)
12 );
13 end if;
14 end loop;
15 end;
16 /
Event 10046 is set at level
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