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TRACE --------------------------------------------------------------------------------/home/ora11gr2/app/ora11gr2/diag/rdbms/orcl/ora11gr2/trace/ora11gr2_ora_1990.trc And this just shows that if the file exists, you ll be able to access it via that name (assuming you have the permissions to read the trace directory!). The following example generates a trace file, showing how the file is created once the trace is enabled: ops$tkyte%ORA11GR2> !ls &T ls: /home/ora11gr2/app/ora11gr2/diag/rdbms/orcl/ora11gr2/trace/ora11gr2_ora_1990.trc: No such file or directory ops$tkyte%ORA11GR2> exec dbms_monitor.session_trace_enable PL/SQL procedure successfully completed. ops$tkyte%ORA11GR2> !ls &T /home/ora11gr2/app/ora11gr2/diag/rdbms/orcl/ora11gr2/trace/ora11gr2_ora_1990.trc As you can see, before we enabled tracing in that session, no file existed; as soon as tracing is enabled, however, we are able to see it. It should be obvious that on Windows you d replace the / with \. If you are using 9i Release 1, instead of adding the instance name into the trace file name, you d simply issue the following: select c.value || 'ora_' || a.spid || '.trc'
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There is a way to tag your trace file so that you can find it even if you are not permitted access to V$PROCESS and V$SESSION. Assuming you have access to read the user_dump_dest directory, you can use the session parameter tracefile_identifier. With this, you can add a uniquely identifiable string to the trace file name, for example: ops$tkyte%ORA11GR2> connect / Connected. ops$tkyte%ORA11GR2> alter session set tracefile_identifier = 'Look_For_Me'; Session altered. ops$tkyte%ORA11GR2> !ls /home/ora11gr2/app/ora11gr2/diag/rdbms/orcl /ora11gr2/trace/*Look_For_Me*.trc ls: /home/ora11gr2/app/ora11gr2/diag/rdbms/orcl/ora11gr2/trace/*Look_For_Me*.trc: No such file or directory ops$tkyte%ORA11GR2> exec dbms_monitor.session_trace_enable PL/SQL procedure successfully completed. ops$tkyte%ORA11GR2> !ls /home/ora11gr2/app/ora11gr2/diag/rdbms/orcl /ora11gr2/trace/*Look_For_Me*.trc /home/ora11gr2/app/ora11gr2/diag/rdbms/orcl/ora11gr2/trace/ora11gr2_ora_2161_Look_For_Me.trc
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As you can see, the trace file is now named in the standard <ORACLE_SID>_ora_<PROCESS_ID> format, but it also has the unique string we specified associated with it, making it easy to find our trace file name.
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I d like to close this section with a discussion about those other kinds of trace files the ones we did not expect that were generated as a result of an ORA-00600 or some other internal error. Is there anything we can do with them The short answer is that, in general, they are not for you and me. They are useful to Oracle Support. However, they can be helpful when we file a service request with Oracle Support. That point is crucial: if you are getting internal errors, the only way they will ever be corrected is if you file a service request. If you just ignore them, they will not get fixed by themselves, except by accident. For example, in Oracle 10g Release 1, if you create the following table and run the query, you may well get an internal error (or not; it was filed as a bug and is corrected in later patch releases): ops$tkyte@ORA10G> create table t ( x int primary key ); Table created. ops$tkyte@ORA10G> insert into t values ( 1 ); 1 row created. ops$tkyte@ORA10G> exec dbms_stats.gather_table_stats( user, 'T' ); PL/SQL procedure successfully completed. ops$tkyte@ORA10G> select count(x) over () 2 from t; from t * ERROR at line 2: ORA-00600: internal error code, arguments: [12410], [], [], [], [], [], [], [] Now, suppose you are the DBA and all of a sudden this trace file pops up in the trace area. Or you are the developer and your application raises an ORA-00600 error and you want to find out what happened. There is a lot of information in that trace file (some 35,000 lines, in fact), but in general it s not useful to you and me. We would generally just compress the trace file and upload it as part of our service request processing. Starting in Oracle database 11g, the process of gathering the trace information and uploading it to support has been modified (and made significantly easier). A new command-line tool, in conjunction with a user interface via Enterprise Manager, allows you to review the trace information in the ADR, and package and transmit it to Oracle Support. The ADRCI tool allows you to review problems (critical errors in the database) and incidents (occurrences of those critical errors) and to package them up for transmission to support. The packaging step includes retrieving not only the trace information, but also details from the database alert log and other configuration/test case information. For example, I set up a situation in my database that raised a critical error (no, I won t say what it is. You have to generate your own critical errors.). I knew I had a problem in my database because the ADRCI tool told me so:
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