如何在数据库中查看alert日志

1、查看操作系统版本：
SQL> select * from v$version;

BANNER
----------------------------------------------------------------
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Prod
PL/SQL Release 10.2.0.1.0 - Production
CORE    10.2.0.1.0      Production
TNS for Linux: Version 10.2.0.1.0 - Production
NLSRTL Version 10.2.0.1.0 - Production

SQL>


2、查看预警日志文件（alert_sid.log）的位置

SQL> show parameter dump

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
background_core_dump                 string      partial
background_dump_dest                 string      /u01/oracle/admin/bdump
core_dump_dest                       string      /u01/oracle/admin/cdump
max_dump_file_size                   string      10240
shadow_core_dump                     string      partial
user_dump_dest                       string      /u01/oracle/admin/udump

3、创建目录alert
注意：directory不是实体，只是一个指向，指向os中一个路径
SQL> create or replace directory alert as '/u01/oracle/admin/bdump';

Directory created.

SQL>

4、创建外部表alert
SQL> create table alert
  1  (log varchar2(1000))
  2  organization external
  3  (type oracle_loader
  4   default directory alert
  5   access parameters
  6  (records delimited by newline)
  7   location ('alert_PROD.log'))
  8  reject limit unlimited;

Table created.

5、查看alert中的内容
SQL> select * from alert where rownum<20;

LOG
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Wed Feb 27 11:05:11 2013
Starting ORACLE instance (normal)
Cannot determine all dependent dynamic libraries for /proc/self/exe
Unable to find dynamic library libocr10.so in search paths
RPATH = /ade/aime1_build2101/oracle/has/lib/:/ade/aime1_build2101/oracle/lib/:/ade/aime1_build2101/oracle/has/lib/:
LD_LIBRARY_PATH is not set!
The default library directories are /lib and /usr/lib
Unable to find dynamic library libocrb10.so in search paths
Unable to find dynamic library libocrutl10.so in search paths
Unable to find dynamic library libocrutl10.so in search paths
LICENSE_MAX_SESSION = 0
LICENSE_SESSIONS_WARNING = 0
Picked latch-free SCN scheme 2
Using LOG_ARCHIVE_DEST_1 parameter default value as /u01/oracle/product/10.2.0/db_1/dbs/arch
Autotune of undo retention is turned on.
IMODE=BR
ILAT =10
LICENSE_MAX_USERS = 0
SYS auditing is disabled

19 rows selected.

SQL>

6、看看数据库有哪些 可爱的ORA- 错误吧
SQL> select * from alert where log like '%ORA-%';

LOG
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
ORA-959 signalled during: alter database default tablespace users...
ORA-959 signalled during: drop tablespace uses...
ORA-12919 signalled during: drop tablespace users...
ORA-1549 signalled during: drop tablespace users...
ORA-1505 signalled during: alter database add logfile group 1
ORA-1184 signalled during: alter database add logfile group 1
ORA-1013 signalled during: alter tablespace tts read only...
ORA-1013 signalled during:  alter tablespace tts read only...
ORA-1013 signalled during: alter tablespace users read only...
ORA-1539 signalled during: alter tablespace users read only...