052-184(新增70题2018)

Where do you find information about a missing redo log file?

A. trace file

B. audit trail

C. control file

D. alert log file

E. event viewer

Answer: D

ALERT.LOG

记录系统日志，比如日志切换的记录，修改系统参数等系统事件。
位置在参数background_dump_dest指定的路径下

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

show parameter background_dump_dest;
NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
background_dump_dest                 string      /home/oracle/app/oracle/diag/rdbms/orcl/orcl/trace

建立表查看alter.log http://www.jb51.net/article/34590.htm

--创建目录
create or replace directory alert as '/home/oracle/app/oracle/diag/rdbms/orcl/orcl/trace'; 
--创建表
create table alert 
(log varchar2(1000)) 
organization external 
(type oracle_loader 
default directory alert 
access parameters 
(records delimited by newline) 
location ('alert_orcl.log')) 
reject limit unlimited; 
--查看alter.llog一般是alter+sid.log
select * from alert where upper(log) like '%REDO%';
这里就可以查看redolog相关的信息了