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）：
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create role trace_10046_role;
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CREATE OR REPLACE TRIGGER SYS.set_10046_trace_on_logon
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AFTER LOGON ON DATABASE
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BEGIN
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if ( dbms_session.is_role_enabled('trace_10046_role') and user not in ('SYS','SYSTEM') ) then
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EXECUTE IMMEDIATE 'alter session set statistics_level=ALL';
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EXECUTE IMMEDIATE 'alter session set max_dump_file_size=UNLIMITED';
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EXECUTE IMMEDIATE 'alter session set tracefile_identifier='''||user||'_10046''';
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EXECUTE IMMEDIATE 'alter session set events ''10046 trace name context forever, level 12''';
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end if;
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END set_10046_trace_on_logon;
启用和禁用对系统进行做10046跟踪SQL：
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SQL> show user;
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USER is "SYS"
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SQL> grant trace_10046_role to cms_text;
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SQL> select * from dba_ROLE_PRIVS where granted_role='TRACE_10046_ROLE';
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GRANTEE GRANTED_ROLE ADM DEF
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------------------------------ ------------------------------ --- ---
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SYS TRACE_10046_ROLE YES YES
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CMS_TEXT TRACE_10046_ROLE NO YES
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Grant succeeded.
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SQL> revoke trace_10046_role from cms_text;
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SQL> select * from dba_ROLE_PRIVS where granted_role='TRACE_10046_ROLE';
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GRANTEE GRANTED_ROLE ADM DEF
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------------------------------ ------------------------------ --- ---
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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：
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[oracle@test-server udump]$ pwd
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/u01/app/admin/ora8i/udump
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[oracle@test-server udump]$ ls
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ora8i_ora_8259_CMS_TEXT_10046.trc