10046事件说明10046事件是Oracle提供的内部事件，是对SQL_TRACE的增强.

10046事件可以设置以下四个级别:

1 - 启用标准的SQL_TRACE功能,等价于sql_trace

4 - Level 1 加上绑定值(bind values)

8 - Level 1 + 等待事件跟踪

12 - Level 1 + Level 4 + Level 8

类似sql_trace，10046事件可以在全局设置，也可以在session级设置。

开启10046事件

SQL> set autotrace off

SQL> SET LINESIZE 80 HEADING OFF FEEDBACK OFF

SELECT

RPAD('USERNAME : ' || s.username,80) ||

RPAD('OSUSER : ' || s.osuser, 80) ||

RPAD('PROGRAM : ' || s.program, 80) ||

RPAD('SPID : ' || p.spid, 80) ||

RPAD('SID : ' || s.sid, 80) ||

RPAD('SERIAL# : ' || s.serial#, 80) ||

RPAD('MACHINE : ' || s.machine, 80) ||

RPAD('TERMINAL : ' || s.terminal,80) ||

RPAD('SQL TEXT : ' || q.sql_text,80)

FROM v$session s

,v$process p

,v$sql q

WHERE s.paddr = p.addr

SQL> 2 3 4 5 6 7 8 9 10 11 12 13 14 15 AND s.sid = '&SID'

AND s.sql_address = q.address(+)

AND s.sql_hash_value = q.hash_value(+);

16 17 Enter value for sid: 102

USERNAME : STAR

OSUSER : oracle

PROGRAM : sqlplus@db01 (TNS V1-V3)

SPID : 26230

SID : 102

SERIAL# : 878

MACHINE : db01

TERMINAL :

SQL TEXT : SELECT ROWID RID FROM COMMUL_INV WHERE ITEMNUMBER NOT LIKE '41%'

SQL> oradebug setospid 26230

Oracle pid: 55, Unix process pid: 26230, image: oracle@db01 (TNS V1-V3)

SQL> oradebug event 10046 trace name context forever,level 12

Statement processed.

SQL> oradebug event 10046 trace name context off

Statement processed.

SQL> oradebug tracefile_name

/home/oracle/admin/commdb/udump/ora_26230.trc

SQL>

SQL> alter session set events '10046 trace name context forever ,level 12' ;

会话已更改。

关闭10046事件

SQL> alter session set events '10046 trace name context off' ;

会话已更改。

SQL> exec dbms_system.set_SQL_TRACE_in_session(127,31923,true);

SQL> select * from dual;

SQL> exec dbms_system.set_SQL_TRACE_in_session(127,31923,false);

当我们使用sql_trace/10046等事件进行进程跟踪时，会生成跟踪文件.跟踪文件名称由以下几部分组成:

ora.trc

以下脚本用户获得跟踪文件名称:

---- 当前 session < xmlnamespace prefix ="o" />

SELECT d.value|| '/' ||lower(rtrim(i.instance, chr( 0 )))|| 'ora' ||p.spid|| '.trc' trace_file_name

from

( select p.spid from v$mystat m,v$session s, v$process p

where m.statistic# = 1 and s.sid = m.sid and p.addr = s.paddr) p,

( select t.instance from v$thread t,v$parameter v

where v.name = 'thread' and (v.value = 0 or t.thread# = to_number(v.value))) i,

( select value from v$parameter where name = 'user_dump_dest' ) d;

---- 其他用户 session

SELECT d.value|| '/' ||lower(rtrim(i.instance, chr( 0 )))|| 'ora' ||p.spid|| '.trc' trace_file_name

from

( select p.spid from v$session s, v$process p

where s.sid= '127' and s. SERIAL#= '31923' and p.addr = s.paddr) p,

( select t.instance from v$thread t,v$parameter v

where v.name = 'thread' and (v.value = 0 or t.thread# = to_number(v.value))) i,

( select value from v$parameter where name = 'user_dump_dest' ) d;

SELECT a.VALUE

|| b.symbol

|| c.instance_name

|| 'ora'

|| d.spid

|| '.trc' trace_file

FROM (SELECT VALUE

FROM v$parameter

WHERE NAME = 'user_dump_dest') a,

(SELECT SUBSTR (VALUE, -6, 1) symbol

FROM v$parameter

WHERE NAME = 'user_dump_dest') b,

(SELECT instance_name

FROM v$instance) c,

(SELECT spid

FROM v$session s, v$process p, v$mystat m

WHERE s.paddr = p.addr AND s.SID = m.SID AND m.statistic# = 0) d

/

SQL> select sid,serial#,username from v$session

2 where username is not null;

SID SERIAL# USERNAME

8 2041 SYS

9 437 EYGLE

设置跟踪:

SQL> exec dbms_system.set_sql_trace_in_session(9,437,true)

PL/SQL procedure successfully completed.

....

可以等候片刻，跟踪session执行任务,捕获sql操作...

....

停止跟踪:

SQL> exec dbms_system.set_sql_trace_in_session(9,437,false)

PL/SQL procedure successfully completed.

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.

当我们通过alter session的方式设置了sql_trace,这个设置是不能通过show parameter的方式得到的,我们需要通过dbms_system.read_ev来获取：

SQL> set feedback off

SQL> 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 1