Oracle动态显示日志

1.查看日志文件位置。

IND_USER@PROD>select inst_id,name,value from v$diag_info;

INST_ID NAME                 VALUE

---------- -------------------- --------------------------------------------------

         1 Diag Enabled         TRUE

         1 ADR Base             /u01/app/oracle

         1 ADR Home             /u01/app/oracle/diag/rdbms/prod/PROD

         1 Diag Trace           /u01/app/oracle/diag/rdbms/prod/PROD/trace

         1 Diag Alert           /u01/app/oracle/diag/rdbms/prod/PROD/alert

         1 Diag Incident        /u01/app/oracle/diag/rdbms/prod/PROD/incident

         1 Diag Cdump           /u01/app/oracle/diag/rdbms/prod/PROD/cdump

         1 Health Monitor       /u01/app/oracle/diag/rdbms/prod/PROD/hm

         1 Default Trace File   /u01/app/oracle/diag/rdbms/prod/PROD/trace/PROD_or

                                a_4873.trc

1 Active Problem Count 0

         1 Active Incident Coun 0

           t

--alert文件夹为一个xml文件；

--trace文件夹中为文本文件；

[oracle@jibo trace]$ pwd

/u01/app/oracle/diag/rdbms/prod/PROD/trace

[oracle@jibo trace]$ ll -atl|grep alert*

-rw-r-----  1 oracle oinstall 99797 Sep 29 14:54 alert_PROD.log

[oracle@jibo trace]$ tail -f alert_PROD.log

Mon Sep 29 14:43:34 2014

Starting background process SMCO

Mon Sep 29 14:43:34 2014

SMCO started with pid=28, OS id=4709

Mon Sep 29 14:54:57 2014

Thread 1 advanced to log sequence 12 (LGWR switch)

  Current log# 3 seq# 12 mem# 0: /u01/app/oracle/oradata/PROD/onlinelog/o1_mf_3_b22567o2_.log

  Current log# 3 seq# 12 mem# 1: /u01/app/oracle/fast_recovery_area/PROD/onlinelog/o1_mf_3_b2256827_.log

Mon Sep 29 14:54:58 2014

Archived Log entry 7 added for thread 1 sequence 11 ID 0x102473b1 dest 1:

--操作系统下查看alert日志。用tail指令；

数据库有什么修改，日志文件就会产生对应的记录

用于查看学习測试最好只是