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显示归档日志信息
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1,使用ARCHIVE LOG LIST命令可以显示日志操作模式,归档位置,自动归档机器要归档的日志序列号等信息.
2显示日志操作模式
SELECT name,log_mode FROM v$database;
3,显示Oracle归归档日志信息.
Col name format a46
Select name, swquence#, first_change# FROM v$archived_log;
Name用于表示Oracle归归档日志文件名,sequence#用于表示归档日志对应的日志序列号,firs_change#用于标识归档日志的起始SCN值.
4、执行介质 恢复 时,需要使用归档日志文件,此四必须准确定位归档日志的存放位置.通过查询动态性能视图v$archive_dest可以取得归档日志所在目录.
SELECT destination FROM v$archive dest;
5,显示日志历史信息
SELECT * FROM v$loghist;
THREAD#用于标识重做线程号,SEQUNCE#用于标识日志序列号,FIRST_CHANGE#用于标识日志序列号对应的起始SCN值,FIRST_TIME用于标识起始SCN的发生时间.SWICTH_CHANGE#用于标识日志切换的SCN值.
6.显示归档进程信息.
进行日志切换时,ARCH进程会自动将重做日志内容复制到Oracle归归档日志中,为了加快归档速度,应该启用多个ARCH进程.通过查询动态性能视图V$ARCHIVE_PROCESSES可以显示所有归档进程的信息!
SELECT * FROM v$archive_processes;
Porcess用于标识ARCH进程的编号,status用于标识ARCH进程的状态(ACTIVE:活动,STOPPED:未启动),log_sequence用于标识正在进行归档的日志序列号,state用于标识ARCH进程的工作状态
1、Oracle日志的路径的查看：
登录：sqlplus "/as sysdba"
查看路径：SQL select * from v$logfile;
SQL select * from v$logfile;(#日志文件路径)
2、Oracle日志文件包含哪些内容：（日志的数量可能略有不同）
control01.ctl example01.dbf redo02.log sysaux01.dbf undotbs01.dbf
control02.ctl redo03.log system01.dbf users01.dbf
control03.ctl redo01.log SHTTEST.dbf temp01.dbf
3、Oracle日志的查看方法语句代码：
SQLselect * from v$sql (#查看最近所作的操作)
SQLselect * fromv $sqlarea（#查看最近所作的操作）
4、LogMiner的使用：
5、查看LogMiner工具分析结果
SQL select * from dict t where t.table_name like '%LOGMNR%'；看所有与logmnr相关的视图
6、分析结果在GV$LOGMNR_CONTENTS 视图中，可按以下语句查询：
selec tscn , timestamp , log_id , seg_owner , seg_type , table_space , data_blk# , data_obj# , data_objd#, session#,serial#,username,session_info,sql_redo,sql_undo from logmnr3 t where t.sql_redo like 'create%';
启动监听日志的步骤如下：
1.首先查看当前监听的状态
[oracle@oel ~]$ lsnrctl status
LSNRCTL for Linux: Version 11.2.0.3.0 – Production on 01-JUL-2012 13:29:58
Copyright (c) 1991, 2011, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=oel)(PORT=1521)))
STATUS of the LISTENER
————————
Alias listener
Version TNSLSNR for Linux: Version 11.2.0.3.0 – Production
Start Date 01-JUL-2012 13:12:51
Uptime 0 days 0 hr. 17 min. 7 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/app/oracle/product/11.2.0/db_1/network/admin/listener.ora
Listening Endpoints Summary…
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=oel)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1521)))
Services Summary…
Service “orcl” has 1 instance(s).
Instance “orcl”, status READY, has 1 handler(s) for this service…
Service “orclXDB” has 1 instance(s).
Instance “orcl”, status READY, has 1 handler(s) for this service…
The command completed successfully
从上面显示信息来看，我们监听正常。并且没有看到Listener Log File的信息。
2.进入监听配置，查看监听详细信息
[oracle@oel ~]$ lsnrctl –进入监听配置
LSNRCTL for Linux: Version 11.2.0.3.0 – Production on 01-JUL-2012 13:35:00
Copyright (c) 1991, 2011, Oracle. All rights reserved.
Welcome to LSNRCTL, type “help” for information.
LSNRCTL show –查看监听参数信息
The following operations are available after show
An asterisk (*) denotes a modifier or extended command:
rawmode displaymode
rules trc_file
trc_directory trc_level
log_file log_directory
log_status current_listener
inbound_connect_timeout startup_waittime
snmp_visible save_config_on_stop
dynamic_registration enable_global_dynamic_endpoint
oracle_home pid
connection_rate_limit
LSNRCTL show log_status –查看监听日志状态
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=oel)(PORT=1521)))
LISTENER parameter “log_status” set to OFF
The command completed successfully
上面信息显示Listener parameter “log_status” set to OFF说明监听日志是关闭的。这是时候我们需要启动监听日志。
3.设置当前监听，如果有多个监听，在修改监听配置的时候需要指定某个具体的监听，我这里只有一个默认的Listener，所以不需要设置。我这里还是演示一下。
LSNRCTL show current_listener
Current Listener is LISTENER
LSNRCTL set current_listener Listener
Current Listener is Listener
LSNRCTL show current_listener
Current Listener is Listener
4.启动监听日志,并且保存配置信息
LSNRCTL set log_status on –设置监听日志状态为on
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=oel)(PORT=1521)))
LISTENER parameter “log_status” set to ON
The command completed successfully
LSNRCTL save_config –保存监听配置
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=oel)(PORT=1521)))
Saved listener configuration parameters.
Listener Parameter File /u01/app/oracle/product/11.2.0/db_1/network/admin/listener.ora
Old Parameter File /u01/app/oracle/product/11.2.0/db_1/network/admin/listener.bak
The command completed successfully
5.在查看监听状态
[oracle@oel ~]$ lsnrctl status
LSNRCTL for Linux: Version 11.2.0.3.0 – Production on 01-JUL-2012 13:44:32
Copyright (c) 1991, 2011, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=oel)(PORT=1521)))
STATUS of the LISTENER
————————
Alias listener
Version TNSLSNR for Linux: Version 11.2.0.3.0 – Production
Start Date 01-JUL-2012 13:12:51
Uptime 0 days 0 hr. 31 min. 41 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/app/oracle/product/11.2.0/db_1/network/admin/listener.ora
Listener Log File /u01/app/oracle/diag/tnslsnr/oel/listener/alert/log.xml
Listening Endpoints Summary…
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=oel)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1521)))
Services Summary…
Service “orcl” has 1 instance(s).
Instance “orcl”, status READY, has 1 handler(s) for this service…
Service “orclXDB” has 1 instance(s).
Instance “orcl”, status READY, has 1 handler(s) for this service…
The command completed successfully
通过上述配置之后，看到了Listener Log File /u01/app/oracle/diag/tnslsnr/oel/listener/alert/log.xml
最后我们可以通过监听日志来查询里面的详细信息
[oracle@oel ~]$ grep ‘2012-07-01T13:45:40′ /u01/app/oracle/diag/tnslsnr/oel/listener/alert/log.xml|more
msg time=’2012-07-01T13:45:40.302+08:00′ org_id=’oracle’ comp_id=’tnslsnr’
监听日志在$ORACLE_BASE/diag/tnslsnr/hostname/listener/trace目录下，文件名为listener.log上面的hostname根据你的实际主机名而定
查看oracle数据库是否为归档模式
SQL select name,log_mode from V$database;
NAME LOG_MODE
------------------ ------------------------
TEST NOARCHIVELOG
SQL archive log list
Database log mode No Archive Mode
Automatic archival Disabled
Archive destination USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence 80157
Current log sequence 80163
编辑本段配置数据库的.归档模式
1.改变非归档模式到归档模式:
1)SQL conn / as sysdba (以DBA身份连接数据库)
2)SQL shutdown immediate;(立即关闭数据库)
3)SQL startup mount (启动实例并加载数据库，但不打开)
4)SQL alter database archivelog; (更改数据库为归档模式)
5)SQL alter database open; (打开数据库)
6)SQL alter system archive log start; (启用自动归档)
7)SQL exit (退出)
做一次完全备份,因为非归档日志模式下产生的备份日志对于归档模式已经不可用了.这一步非非常重要!
2.改变归档模式到非归档模式:
1)SQLSHUTDOWN NORMAL/IMMEDIATE;
2)SQLSTARTUP MOUNT;
3)SQLALTER DATABASE NOARCHIVELOG;
4)SQLALTER DATABASE OPEN;
3.归档相关命令
archive log stop;
archive log start;
archive log list;
show parameters;
show parameters log_archive_start;
show parameters log_archive_max_process; #归档进程数
alter system set log_archive_max_process=5; #将归档进程数改为5
select * from v$bgprocess; #检察后台进程