10g&9i的alert日志：进入oracle：

[zhangshengdong@oralocal1 ~]$ sudo su - oracle

[oracle@oralocal1 ~]$ sqlplus "/as sysdba"

SQL> select * from v$version; (查看一下版本)

SQL> show parameter dump;(查看一下dump)

NAME                                 TYPE        VALUE

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

background_core_dump                 string      partial

background_dump_dest                 string      /ora/OraHome/admin/oracle9i/bdump

core_dump_dest                       string      /ora/OraHome/admin/oracle9i/cdump

max_dump_file_size                   string      UNLIMITED

shadow_core_dump                     string      partial

user_dump_dest                       string      /ora/OraHome/admin/oracle9i/udump

10g和9i的alert日志文件都在/ora/OraHome/admin/oracle9i/bdump中

[oracle@oralocal1 ~]$ cd /ora/OraHome/admin/oracle9i/bdump

[oracle@oralocal1 bdump]$ ls

alert_oracle9i.log

11g的alert日志发生了改变：

SQL> col name format a20;

SQL> col value format a40;

SQL> select name,value From v$diag_info;

NAME                 VALUE

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

Diag Enabled         TRUE

ADR Base             f:\app\zsd

ADR Home             f:\app\zsd\diag\rdbms\oracle11g\oracle11g

Diag Trace           f:\app\zsd\diag\rdbms\oracle11g\oracle11g\trace

Diag Alert           f:\app\zsd\diag\rdbms\oracle11g\oracle11g\alert

NAME                 VALUE

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

Diag Incident        f:\app\zsd\diag\rdbms\oracle11g\oracle11g\incident

Diag Cdump           f:\app\zsd\diag\rdbms\oracle11g\oracle11g\cdump

Health Monitor       f:\app\zsd\diag\rdbms\oracle11g\oracle11g\hm

Default Trace File   f:\app\zsd\diag\rdbms\oracle11g\oracle11g\trace\oracle11g_ora_1864.trc

alert日志就在：

f:\app\zsd\diag\rdbms\oracle11g\oracle11g\tracea\alert_ora11g.log

f:\app\zsd\diag\rdbms\oracle11g\oracle11g\alert\log.xml

这两个文件中