在Oracle中跟踪某几个用户的SQL

在Oracle中做SQL跟踪，估计大部分都会用sqlplus中的autotrace或者设置10046跟踪。但是，如果是调试某个应用系统的话，特别是打开了连接池的系统，靠以上两种方法基本上就歇菜了。还是SQL Server的SQL Server Profiler好啊。

最近在看冯大辉翻译的《Oracle性能诊断艺术》，发现一个很好的技巧，思路是建一个Logon，现摘录如下（稍作了一个修改）：

create role trace_10046_role; 

CREATE OR REPLACE TRIGGER SYS.set_10046_trace_on_logon
AFTER LOGON ON DATABASE
BEGIN
  if ( dbms_session.is_role_enabled('trace_10046_role') and user not in ('SYS','SYSTEM')  ) then
    EXECUTE IMMEDIATE 'alter session set statistics_level=ALL';
    EXECUTE IMMEDIATE 'alter session set max_dump_file_size=UNLIMITED';
    EXECUTE IMMEDIATE 'alter session set tracefile_identifier='''||user||'_10046''';
    EXECUTE IMMEDIATE 'alter session set events ''10046 trace name context forever, level 12''';
  end if; 
END set_10046_trace_on_logon;

启用和禁用对系统进行做10046跟踪SQL：

SQL> show user;
USER is "SYS"
SQL> grant trace_10046_role to cms_text;
SQL> select * from dba_ROLE_PRIVS where granted_role='TRACE_10046_ROLE';

GRANTEE                        GRANTED_ROLE                   ADM DEF
------------------------------ ------------------------------ --- ---
SYS                            TRACE_10046_ROLE               YES YES
CMS_TEXT                       TRACE_10046_ROLE               NO  YES
Grant succeeded.
SQL> revoke trace_10046_role from cms_text; 
SQL> select * from dba_ROLE_PRIVS where granted_role='TRACE_10046_ROLE';

GRANTEE                        GRANTED_ROLE                   ADM DEF
------------------------------ ------------------------------ --- ---
SYS                            TRACE_10046_ROLE               YES YES

其实就是将 trace_10046_role grant/revoke 给相应的用户。

当具有 trace_10046_role 角色的用户登录后在udump下就会出现相应的trc文件：

[oracle@test-server udump]$ pwd
/u01/app/admin/ora8i/udump
[oracle@test-server udump]$ ls
ora8i_ora_8259_CMS_TEXT_10046.trc