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2008-12-30 22:01:03

Diagnositic Files
Contain information about signiificant events encountered.
 
Several types exist:
・alertSID.log
  Records the commands;Records results of major events
   Used for day-to-day operational information;Used for diagnosing database errors;
   Location defined by BACKGROUND_DUMP_DEST
・Background Trace Files: SID_processname_PID.trc
   Log errors detected by any background process;
   Location defined by 
・User Trace Files:Files: SID_ora_PID.trc
   produced by the user process
   can be generated by a server process
   Location defined by USER_DUMP_DEST
 
Enable/Disable User Tracing
  Session level:
    ①SQL>alter session set sql_trace =true;
    ②SQL>dbms_system.SET_SQL_TRACE_IN_SESSION
  Instance level
    setting the imitialization parameter:
      SQL_Trace =TRUE
 
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