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Oracle最强有力的辅助诊断工具SQL_TRACE

http://www.weaseek.com 2008-04-30 09:46:48 来源：赛迪网

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 SYS9 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> select 2 d.value||'/'||lower(rtrim(i.instance, chr(0)))||'_ora_'||p.spid||'.trc' trace_file_name 3 from 4 ( select p.spid 5 from sys.v$mystat m,sys.v$session s,sys.v$process p 6 where m.statistic# = 1 and s.sid = m.sid and p.addr = s.paddr) p, 7 ( select t.instance from sys.v$thread t,sys.v$parameter v 8 where v.name = 'thread' and (v.value = 0 or t.thread# = to_number(v.value))) i, 9 ( select value from sys.v$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 1

[作者：Alizze]

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