题目部分
在Oracle中,如何获取trace文件的路径?
♣
答案部分
跟踪文件(Trace File)一般位于“user_dump_dest”参数所指定的目录中,具体路径可以通过以下几种方式查询获得。
1、通过user_dump_dest查询
运行如下SQL语句来创建视图:
CREATE OR REPLACE VIEW VW_SQL_TRACE_NAME_LHR AS
SELECT D.VALUE || '/' || LOWER(RTRIM(I.INSTANCE, CHR(0))) || '_ora_' ||
P.SPID || '.trc' TRACE_FILE_NAME
FROM (SELECT P.SPID
FROM V$MYSTAT M, V$SESSION S, V$PROCESS P
WHERE M.STATISTIC# = '1'
AND S.SID = M.SID
AND P.ADDR = S.PADDR) P,
(SELECT T.INSTANCE
FROM V$THREAD T, V$PARAMETER V
WHERE V.NAME = 'thread'
AND (V.VALUE = '0' OR TO_CHAR(T.THREAD#) = V.VALUE)) I,
(SELECT VALUE FROM V$PARAMETER WHERE NAME = 'user_dump_dest') D;
创建公共同义词的命令如下所示:
CREATE OR REPLACE PUBLIC SYNONYM SYN_TRACENAME_LHR FOR VW_SQL_TRACE_NAME_LHR;
查询同义词或视图都可以得到当前会话的trace文件名。
SYS@lhrdb> SELECT * FROM VW_SQL_TRACE_NAME_LHR;
TRACE_FILE_NAME
--------------------------------------------------------------------------------
/oracle/app/oracle/diag/rdbms/lhrdb/lhrdb/trace/lhrdb_ora_19660944.trc
2、Oracle 11g可以通过查询V$DIAG_INFO获取
SYS@lhrdb> SELECT VALUE FROM V$DIAG_INFO WHERE NAME LIKE '%Default%';
VALUE
--------------------------------------------------------------------------------
/oracle/app/oracle/diag/rdbms/lhrdb/lhrdb/trace/lhrdb_ora_19660944.trc
3、oradebug tracefile_name获取
SYS@lhrdb> oradebug setmypid
Statement processed.
SYS@lhrdb> oradebug tracefile_name
/oracle/app/oracle/diag/rdbms/lhrdb/lhrdb/trace/lhrdb_ora_19660944.trc
4、通过参数直接查询
SYS@lhrdb> ALTER SYSTEM DUMP DATAFILE 1 BLOCK 380313;
System altered.
SYS@lhrdb> SHOW PARAMETER USER_DUMP_DEST
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------------------------------
user_dump_dest string /oracle/app/oracle/diag/rdbms/lhrdb/lhrdb/trace
SYS@lhrdb> ! ls -lrt /oracle/app/oracle/diag/rdbms/lhrdb/lhrdb/trace/*.trc | tail -n 5
-rw-r----- 1 oracle asmadmin 34143 Sep 27 13:00 /oracle/app/oracle/diag/rdbms/lhrdb/lhrdb/trace/lhrdb_m001_15859814.trc
-rw-r----- 1 oracle asmadmin 49356 Sep 27 14:00 /oracle/app/oracle/diag/rdbms/lhrdb/lhrdb/trace/lhrdb_m001_15728766.trc
-rw-r----- 1 oracle asmadmin 19089 Sep 27 15:00 /oracle/app/oracle/diag/rdbms/lhrdb/lhrdb/trace/lhrdb_m001_28377292.trc
-rw-r----- 1 oracle asmadmin 32115 Sep 27 15:04 /oracle/app/oracle/diag/rdbms/lhrdb/lhrdb/trace/lhrdb_mmon_21233818.trc
-rw-r----- 1 oracle asmadmin 21278 Sep 27 15:05 /oracle/app/oracle/diag/rdbms/lhrdb/lhrdb/trace/lhrdb_ora_19660944.trc
& 说明:
有关获取trace文件的更多内容可以参考我的BLOG:http://blog.itpub.net/26736162/viewspace-2125659
本文选自《Oracle程序员面试笔试宝典》,作者:小麦苗