结论

1,基于oradebug 的alter system set events='60 trace name errorstack forever,level 3';
  是分析或获取死锁信息的一处重要手段


2,errorstack适用于诊断某种特定的ORACLE错误
3,且记是alter system set events,而非set event,否则会报错  


4，还有一点，通过10046也可以分析死锁

测试

--oracle version
SQL> select * from v$version where rownum=1;


BANNER
----------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Prodoction




---event parameter
SQL> show parameter event


NAME                                 TYPE                   VALUE
------------------------------------ ---------------------- ------------------------------
event                                string


SQL> oradebug setospid 15936
Oracle pid: 184, Unix process pid: 15936, image: oracle@seconary (TNS V1-V3)
SQL> alter system set events='60 trace name errorstack forever,level 3';


System altered.


SQL> alter system set events='60 trace name errorstack off';


System altered.


SQL> oradebug tracefile_name
/oracle/diag/rdbms/guowang/guowang/trace/guowang_ora_15936.trc


产生的TRACE FILE我再列举，和前文格式相同，内容一致