Oracle 12C R2-新特性-新增两个视图:方便查看trace文件和内容

在12.2中，Oracle新增了两个V$DIAG_TRACE_FILE and V$DIAG_TRACE_FILE_CONTENTS视图，使查看trace文件路径及其内容变得非常简单。不用大把拼接sql去查了。
如：

查看con_id为3的产生的trace文件路径及名称

SQL> SELECT ADR_HOME,TRACE_FILENAME,CON_ID
FROM   v$diag_trace_file
WHERE  con_id = 3;

ADR_HOME         TRACE_FILENAME   CON_ID
---------------------------------------------------------------------- ------------------------------ ----------
/u01/app/oracle/diag/rdbms/orcl/orcl         orcl_mmon_2309.trc        1
/u01/app/oracle/diag/rdbms/orcl/orcl         orcl_ora_5757.trc         1
/u01/app/oracle/diag/rdbms/orcl/orcl         orcl_lgwr_2289.trc        1
/u01/app/oracle/diag/rdbms/orcl/orcl         orcl_dia0_6296.trc        1
/u01/app/oracle/diag/rdbms/orcl/orcl         orcl_ofsd_6282_6286.trc         1
/u01/app/oracle/diag/rdbms/orcl/orcl         orcl_dia0_6171_base_1.trc         1
/u01/app/oracle/diag/rdbms/orcl/orcl         orcl_svcb_5836.trc        1
/u01/app/oracle/diag/rdbms/orcl/orcl         orcl_ora_2231.trc         1

查看对应trace文件内容

SQL> SELECT payload
FROM   v$diag_trace_file_contents
WHERE  trace_filename = 'orcl_mmon_2309.trc'
ORDER BY line_number;

....内容太多。。。

*** 2017-02-16T21:04:34.754390+08:00 (CDB$ROOT(1))
AUTO SGA: kmgs_parameter_update_timeout gen0 0 mmon alive 1
PAYLOAD
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
*** 2017-02-16T21:04:37.755725+08:00 (CDB$ROOT(1))
AUTO SGA: kmgs_parameter_update_timeout gen0 0 mmon alive 1
*** 2017-02-16T21:04:40.756642+08:00 (CDB$ROOT(1))
AUTO SGA: kmgs_parameter_update_timeout gen0 0 mmon alive 1
1179 rows selected.