alert日志记录oracle实例生命周期中发生的重要事件，例如数据库启动、关闭、日志切换等，方便程序员和管理员发现问题。有时alert日志内容较多，我们很难快速定位我们感兴趣的信息，例如数据库启动时间。今天和大家分享一个利用外部表，根据alert日志查询数据库启动、关闭数据库时间的方法，个人认为非常好用。

创建转储目录

首先我们创建一个目录，用来指定alert日志的路径。

SQL> select * from v$version;

BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - Production
PL/SQL Release 11.2.0.3.0 - Production
CORE 11.2.0.3.0 Production
TNS for Linux: Version 11.2.0.3.0 - Production
NLSRTL Version 11.2.0.3.0 - Production

SQL> show parameter background_dump_dest

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
background_dump_dest string /u01/app/oracle/diag/rdbms/hoegh/HOEGH/trace
SQL>
SQL> create or replace directory data_dir as '/u01/app/oracle/diag/rdbms/hoegh/HOEGH/trace';

Directory created.

SQL>

创建外部表

SQL>
SQL> CREATE TABLE alert_log
(
text_line varchar2(255)
)
ORGANIZATION EXTERNAL
(
TYPE ORACLE_LOADER
DEFAULT DIRECTORY data_dir
ACCESS PARAMETERS
(
records delimited by newline
fields
)
LOCATION
(
'alert_HOEGH.log'
)
)
reject limit unlimited
/ 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

Table created.

SQL>

执行查询

SQL> set linesize 300
set pagesize 100
select to_char(last_time,'dd-mon-yyyy hh24:mi') shutdown,
to_char(start_time,'dd-mon-yyyy hh24:mi') startup,
round((start_time-last_time)*24*60,2) mins_down,
round((last_time-lag(start_time) over (order by r)),2) days_up,
case when (lead(r) over (order by r) is null )
then round((sysdate-start_time),2)
end days_still_up
from (
select r,
to_date(last_time, 'Dy Mon DD HH24:MI:SS YYYY') last_time,
to_date(start_time,'Dy Mon DD HH24:MI:SS YYYY') start_time
from (
select r,
text_line,
lag(text_line,1) over (order by r) start_time,
lag(text_line,2) over (order by r) last_time
from (
select rownum r, text_line
from alert_log
where text_line like '___ ___ __ __:__:__ 20__'
or text_line like 'ALTER DATABASE OPEN'
)
)
where text_line like 'ALTER DATABASE OPEN'
)
/SQL> SQL> 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26

SHUTDOWN STARTUP MINS_DOWN DAYS_UP DAYS_STILL_UP
-------------------------- -------------------------- ---------- ---------- -------------
13-oct-2014 23:36 13-oct-2014 23:36 .08
13-oct-2014 23:37 13-oct-2014 23:37 .07 0
14-oct-2014 00:13 14-oct-2014 00:13 .07 .03
14-oct-2014 00:16 14-oct-2014 00:16 .07 0
14-oct-2014 00:18 14-oct-2014 00:18 .07 0
14-oct-2014 00:21 14-oct-2014 00:22 .07 0
07-jan-2016 23:00 07-jan-2016 23:00 .07 450.94
08-jan-2016 20:02 08-jan-2016 20:02 .08 .88
08-jan-2016 20:15 08-jan-2016 20:15 .07 .01 26.04

9 rows selected.

SQL>

~~~~~~~ the end~~~~~~~~~

hoegh

2016.02.03

ITPub博客

根据Alert日志查询数据库启动、关闭时间

创建转储目录

创建外部表

执行查询

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