ITPub博客

首页 > 数据库 > Oracle > 【DATAGUARD】物理dg的switchover切换(五)

【DATAGUARD】物理dg的switchover切换(五)

Oracle 作者:Appleses 时间:2016-01-30 15:31:05 0 删除 编辑

DATAGUARD】物理dgswitchover切换(五)

1.1  BLOG文档结构图

 

image

 

1.2  前言部分

 

1.2.1  导读

各位技术爱好者,看完本文后,你可以掌握如下的技能,也可以学到一些其它你所不知道的知识,~O(∩_∩)O~:

物理dg的switchover切换演练过程

物理dg管理和维护的一些sql

 

注意:本篇BLOG中代码部分需要特别关注的地方我都用黄色背景和红色字体来表示,比如下边的例子中,thread 1的最大归档日志号为33thread 2的最大归档日志号为43是需要特别关注的地方。

  List of Archived Logs in backup set 11

  Thrd Seq     Low SCN    Low Time            Next SCN   Next Time

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

  1    32      1621589    2015-05-29 11:09:52 1625242    2015-05-29 11:15:48

  1    33      1625242    2015-05-29 11:15:48 1625293    2015-05-29 11:15:58

  2    42      1613951    2015-05-29 10:41:18 1625245    2015-05-29 11:15:49

  2    43      1625245    2015-05-29 11:15:49 1625253    2015-05-29 11:15:53

 

 

 

 

 

本文如有错误或不完善的地方请大家多多指正,ITPUB留言或QQ皆可,您的批评指正是我写作的最大动力。

1.2.2  实验环境介绍

 

 项目

主库

dg

db 类型

单实例

单实例

db version

11.2.0.3

11.2.0.3

db 存储

FS type

FS type

ORACLE_SID

oradg11g

oradgphy

db_name

oradg11g

oradg11g

主机IP地址:

192.168.59.130

192.168.59.130

OS版本及kernel版本

RHEL6.5 64位,2.6.32-504.16.2.el6.x86_64

RHEL6.5 64位,2.6.32-504.16.2.el6.x86_64

OS hostname

rhel6_lhr

rhel6_lhr

 

 

 

1.2.3  相关参考文章链接

 

【DATAGUARD】 基于同一个主机建立物理备库和逻辑备库(一): http://blog.itpub.net/26736162/viewspace-1448197/
【DATAGUARD】 基于同一个主机建立物理备库和逻辑备库(二 ):  http://blog.itpub.net/26736162/viewspace-1448207/
【DATAGUARD】 基于同一个主机建立物理备库和逻辑备库(三 ):  http://blog.itpub.net/26736162/viewspace-1481972/
【DATAGUARD】 基于同一个主机建立物理备库和逻辑备库 (四)--添加一个物理dg节点 :http://blog.itpub.net/26736162/viewspace-1484878/

 

 

1.2.4  本文简介

 

这段时间比较忙,一直没有更新blog了,看了大神们一直在坚持写blog,真心佩服。这几天一个客户要搭建物理dg,顺便演示switchover的切换,这里我整理了一下共享出来,希望对大家有用,本次实验的环境基于http://blog.itpub.net/26736162/viewspace-1448197/ 文章中搭建的环境,下一章中介绍failover的切换。

 

 

1.3  相关知识点扫盲

1.角色

Oracle 数据库中含有两种角色。

用户角色:定义了一组权限的集合,该角色可以分配给用户,也可以分配给其他角色。

数据库角色:在备库中数据库扮演什么样的角色,primary还是standby。

v$database.DATABASE_ROLE标识了数据库的运行角色。

处于备库环境中,数据库有两种类型:phsical standby、logical standby。

2.角色管理服务

一个数据库运行在如下互相排斥的角色中。

Primary role:一个数据库运行在primary role,那么log transport services传递重做日志到备库。

Standby role:一个数据库运行在standby role,那么log apply services应用归档日志到备库。

角色管理服务允许用户动态地在主、备库中进行角色切换。

用户可以使用角色管理服务,进行主、备库的计划中的角色切换,这个叫switchover,或者是非计划中的角色切换,叫failover。

3.Switchover&Failover

切换是在主数据库与其备数据库之间进行角色反转,切换确保不丢失数据。这是对于主系统计划维护的典型操作。在切换期间,主数据库转换到备角色,备数据库转换到主角色。转换发生不需要重建任何数据库。

(1)Switchover

用到的场景:计划中的角色转换或用户操作系统和硬件的维护等。

(2)Failover

故障转移是当主数据库不可用时执行的。故障转移只有在主数据库灾难故障的情况下执行,并且故障转移导致备数据库转换到主角色。用到的场景:非计划中的角色切换,一般在紧急情况下使用。根据保护模式的不同,可能会没有或者很少的数据损失。

(3)角色转换决策树

角色转换(switchover&failover)的最终目的是尽快地使主库在线,而同时尽量减少数据损失或者是实现无数据损失。尽量选择宕机时间最短,同时数据损失最小的策略。总之在失败切换前,应该先考虑修复主数据库或者进行无数据损失的角色转换。

即使使用无数据损失的备库方案,修复主库可能会比切换到备库更快点。如果修复了主库,那么就不需要修改客户端的连接。但是如果修复工作导致了任何的数据损失,那么可能需要重新创建所有的备用数据库。

通常情况下,最合适切换的备库为已经应用了最多的归档日志的备用数据库。

 

 

 

 

1.4  实验部分

 

1.4.1  实验目标

 

 

① 主库和物理dgswitchover切换

② 还原为最初始的状态

 

1.4.2  实验过程

 

1.4.2.1  主库oradg11g的参数设置检查

 

这里主要有2个内容需要检测:

① fal_clientfal_serverstandby_file_managementdb_file_name_convert log_filename_convert是否合理

② standbylog file 是否已经创建

 

[oracle@rhel6_lhr ~]$ echo $ORACLE_SID

oradg11g

[oracle@rhel6_lhr ~]$

[oracle@rhel6_lhr ~]$ sqlplus / as sysdba

 

SQL*Plus: Release 11.2.0.3.0 Production on 星期日 7月 26 17:33:53 2015

 

Copyright (c) 1982, 2011, Oracle.  All rights reserved.

 

 

连接到:

Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options

 

17:33:53 SQL> col name format a25

17:33:55 SQL> col VALUE format a20

17:33:55 SQL> SELECT a.NAME,a.VALUE

17:33:55   2  FROM   v$parameter a

17:33:55   3  WHERE  a.NAME LIKE '%file_name_convert'

17:33:55   4  OR     a.NAME LIKE 'fal%'

17:33:55   5  OR     a.NAME LIKE 'standby_file%';

 

NAME                      VALUE

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

db_file_name_convert      oradgphy, oradg11g

log_file_name_convert     oradgphy, oradg11g

fal_client                oradg11g

fal_server                oradgphy

standby_file_management   AUTO

 

已用时间:  00: 00: 00.01

17:33:56 SQL>

20:32:09 SQL> set line 9999 pagesize 9999

20:36:47 SQL> col  db_id  format a15

20:36:47 SQL> select  GROUP#, DBID db_id, THREAD#, SEQUENCE#, BYTES,  USED, ARCHIVED, STATUS, FIRST_CHANGE#,  NEXT_CHANGE#,LAST_CHANGE# from v$standby_log ;

 

    GROUP# DB_ID              THREAD#  SEQUENCE#      BYTES       USED ARC STATUS     FIRST_CHANGE# NEXT_CHANGE# LAST_CHANGE#

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

         4 UNASSIGNED               1          0   52428800          0 YES UNASSIGNED

         5 UNASSIGNED               1          0   52428800          0 YES UNASSIGNED

         6 UNASSIGNED               0          0   52428800          0 YES UNASSIGNED

         7 UNASSIGNED               0          0   52428800          0 YES UNASSIGNED

 

已用时间:  00: 00: 00.02

20:36:47 SQL> select * from v$logfile;

 

    GROUP# STATUS  TYPE    MEMBER                                                                                                                                                                                     IS_

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

         3         ONLINE  /u01/app/oracle/oradata/oradg11g/redo03.log                                                                                                                                                NO

         2         ONLINE  /u01/app/oracle/oradata/oradg11g/redo02.log                                                                                                                                                NO

         1         ONLINE  /u01/app/oracle/oradata/oradg11g/redo01.log                                                                                                                                                NO

         4         STANDBY /u01/app/oracle/oradata/oradg11g/standby_redo04.log                                                                                                                                        NO

         5         STANDBY /u01/app/oracle/oradata/oradg11g/standby_redo05.log                                                                                                                                        NO

         6         STANDBY /u01/app/oracle/oradata/oradg11g/standby_redo06.log                                                                                                                                        NO

         7         STANDBY /u01/app/oracle/oradata/oradg11g/standby_redo07.log                                                                                                                                        NO

 

已选择7行。

 

已用时间:  00: 00: 00.00

20:37:00 SQL> ! ls  /u01/app/oracle/oradata/oradg11g/standby*

/u01/app/oracle/oradata/oradg11g/standby_redo04.log  /u01/app/oracle/oradata/oradg11g/standby_redo06.log

/u01/app/oracle/oradata/oradg11g/standby_redo05.log  /u01/app/oracle/oradata/oradg11g/standby_redo07.log

 

20:37:11 SQL>

 

1.4.2.2  主库oradg11g执行切换

17:35:45 SQL> select name, LOG_MODE, OPEN_MODE, database_role, SWITCHOVER_STATUS, db_unique_name from v$database;

 

NAME      LOG_MODE     OPEN_MODE            DATABASE_ROLE    SWITCHOVER_STATUS    DB_UNIQUE_NAME

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

ORADG11G  ARCHIVELOG   READ WRITE          PRIMARY          TO STANDBY           oradg11g

 

已用时间:  00: 00: 00.01

17:35:46 SQL> alter database commit to switchover to physical standby with session shutdown;

 

数据库已更改。

 

已用时间:  00: 00: 06.22

17:36:14 SQL> shutdown immediate

ORA-01092: ORACLE instance terminated. Disconnection forced

17:36:35 SQL> ORA-24324: 未初始化服务句柄

ORA-01041: 内部错误, hostdef 扩展名不存在

17:36:35 SQL> exit

从 Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options 断开

[oracle@rhel6_lhr ~]$ sqlplus / as sysdba

 

SQL*Plus: Release 11.2.0.3.0 Production on 星期日 7月 26 17:36:39 2015

 

Copyright (c) 1982, 2011, Oracle.  All rights reserved.

 

已连接到空闲例程。

 

17:36:39 SQL> startup  mount;

ORACLE 例程已经启动。

 

Total System Global Area  325685248 bytes

Fixed Size                  2228064 bytes

Variable Size             192938144 bytes

Database Buffers          125829120 bytes

Redo Buffers                4689920 bytes

数据库装载完毕。

17:36:52 SQL> select name, LOG_MODE, OPEN_MODE, database_role, SWITCHOVER_STATUS, db_unique_name from v$database;

 

NAME      LOG_MODE     OPEN_MODE            DATABASE_ROLE    SWITCHOVER_STATUS    DB_UNIQUE_NAME

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

ORADG11G  ARCHIVELOG   MOUNTED             PHYSICAL STANDBY RECOVERY NEEDED      oradg11g

 

已用时间:  00: 00: 00.01

17:37:04 SQL>

 

告警日志:

Sun Jul 26 17:36:07 2015

alter database commit to switchover to physical standby with session shutdown

ALTER DATABASE COMMIT TO SWITCHOVER TO PHYSICAL STANDBY [Process Id: 37669] (oradg11g)

Sun Jul 26 17:36:07 2015

Thread 1 advanced to log sequence 127 (LGWR switch)

  Current log# 1 seq# 127 mem# 0: /u01/app/oracle/oradata/oradg11g/redo01.log

Sun Jul 26 17:36:07 2015

Stopping background process CJQ0

Stopping background process QMNC

All dispatchers and shared servers shutdown

CLOSE: killing server sessions.

Active process 37415 user 'grid' program 'oracle@rhel6_lhr'

Active process 37413 user 'grid' program 'oracle@rhel6_lhr'

Active process 37483 user 'oracle' program 'oracle@rhel6_lhr (W000)'

Active process 37483 user 'oracle' program 'oracle@rhel6_lhr (W000)'

Active process 37415 user 'grid' program 'oracle@rhel6_lhr'

Active process 37413 user 'grid' program 'oracle@rhel6_lhr'

Active process 37483 user 'oracle' program 'oracle@rhel6_lhr (W000)'

Active process 37483 user 'oracle' program 'oracle@rhel6_lhr (W000)'

Active process 37415 user 'grid' program 'oracle@rhel6_lhr'

Active process 37413 user 'grid' program 'oracle@rhel6_lhr'

Active process 37483 user 'oracle' program 'oracle@rhel6_lhr (W000)'

Active process 37483 user 'oracle' program 'oracle@rhel6_lhr (W000)'

Active process 37415 user 'grid' program 'oracle@rhel6_lhr'

Active process 37413 user 'grid' program 'oracle@rhel6_lhr'

Active process 37483 user 'oracle' program 'oracle@rhel6_lhr (W000)'

Active process 37483 user 'oracle' program 'oracle@rhel6_lhr (W000)'

Active process 37415 user 'grid' program 'oracle@rhel6_lhr'

Active process 37413 user 'grid' program 'oracle@rhel6_lhr'

Active process 37483 user 'oracle' program 'oracle@rhel6_lhr (W000)'

Active process 37483 user 'oracle' program 'oracle@rhel6_lhr (W000)'

Active process 37415 user 'grid' program 'oracle@rhel6_lhr'

Active process 37413 user 'grid' program 'oracle@rhel6_lhr'

Active process 37483 user 'oracle' program 'oracle@rhel6_lhr (W000)'

Active process 37483 user 'oracle' program 'oracle@rhel6_lhr (W000)'

Active process 37415 user 'grid' program 'oracle@rhel6_lhr'

Active process 37413 user 'grid' program 'oracle@rhel6_lhr'

Active process 37483 user 'oracle' program 'oracle@rhel6_lhr (W000)'

Active process 37483 user 'oracle' program 'oracle@rhel6_lhr (W000)'

Active process 37415 user 'grid' program 'oracle@rhel6_lhr'

Active process 37413 user 'grid' program 'oracle@rhel6_lhr'

Active process 37483 user 'oracle' program 'oracle@rhel6_lhr (W000)'

Active process 37483 user 'oracle' program 'oracle@rhel6_lhr (W000)'

Active process 37415 user 'grid' program 'oracle@rhel6_lhr'

Active process 37413 user 'grid' program 'oracle@rhel6_lhr'

Active process 37483 user 'oracle' program 'oracle@rhel6_lhr (W000)'

Active process 37483 user 'oracle' program 'oracle@rhel6_lhr (W000)'

Active process 37415 user 'grid' program 'oracle@rhel6_lhr'

Active process 37413 user 'grid' program 'oracle@rhel6_lhr'

Active process 37483 user 'oracle' program 'oracle@rhel6_lhr (W000)'

Active process 37483 user 'oracle' program 'oracle@rhel6_lhr (W000)'

Active process 37415 user 'grid' program 'oracle@rhel6_lhr'

Active process 37413 user 'grid' program 'oracle@rhel6_lhr'

Active process 37483 user 'oracle' program 'oracle@rhel6_lhr (W000)'

Active process 37483 user 'oracle' program 'oracle@rhel6_lhr (W000)'

Active process 37415 user 'grid' program 'oracle@rhel6_lhr'

Active process 37413 user 'grid' program 'oracle@rhel6_lhr'

Active process 37483 user 'oracle' program 'oracle@rhel6_lhr (W000)'

Active process 37483 user 'oracle' program 'oracle@rhel6_lhr (W000)'

Active process 37415 user 'grid' program 'oracle@rhel6_lhr'

Active process 37413 user 'grid' program 'oracle@rhel6_lhr'

Active process 37483 user 'oracle' program 'oracle@rhel6_lhr (W000)'

Active process 37483 user 'oracle' program 'oracle@rhel6_lhr (W000)'

Active process 37415 user 'grid' program 'oracle@rhel6_lhr'

Active process 37413 user 'grid' program 'oracle@rhel6_lhr'

Active process 37483 user 'oracle' program 'oracle@rhel6_lhr (W000)'

Active process 37483 user 'oracle' program 'oracle@rhel6_lhr (W000)'

CLOSE: all sessions shutdown successfully.

Waiting for all non-current ORLs to be archived...

Waiting for the ORL for thread 1 sequence 126 to be archived...

Sun Jul 26 17:36:11 2015

Archived Log entry 349 added for thread 1 sequence 126 ID 0x5441e6d9 dest 1:

ORL for thread 1 sequence 126 has been archived...

All non-current ORLs have been archived.

Waiting for all FAL entries to be archived...

All FAL entries have been archived.

Waiting for potential Physical Standby switchover target to become synchronized...

Active, synchronized Physical Standby switchover target has been identified

Switchover End-Of-Redo Log thread 1 sequence 127 has been fixed

Switchover: Primary highest seen SCN set to 0x0.0x1a1f6f

ARCH: Noswitch archival of thread 1, sequence 127

ARCH: End-Of-Redo Branch archival of thread 1 sequence 127

ARCH: LGWR is actively archiving destination LOG_ARCHIVE_DEST_2

ARCH: Standby redo logfile selected for thread 1 sequence 127 for destination LOG_ARCHIVE_DEST_2

Archived Log entry 350 added for thread 1 sequence 127 ID 0x5441e6d9 dest 1:

ARCH: Archiving is disabled due to current logfile archival

Primary will check for some target standby to have received alls redo

Final check for a synchronized target standby. Check will be made once.

LOG_ARCHIVE_DEST_2 is a potential Physical Standby switchover target

Active, synchronized target has been identified

Target has also received all redo

Backup controlfile written to trace file /u01/app/oracle/diag/rdbms/oradg11g/oradg11g/trace/oradg11g_ora_37669.trc

Clearing standby activation ID 1413605081 (0x5441e6d9)

The primary database controlfile was created using the

'MAXLOGFILES 16' clause.

There is space for up to 13 standby redo logfiles

Use the following SQL commands on the standby database to create

standby redo logfiles that match the primary database:

ALTER DATABASE ADD STANDBY LOGFILE 'srl1.f' SIZE 52428800;

ALTER DATABASE ADD STANDBY LOGFILE 'srl2.f' SIZE 52428800;

ALTER DATABASE ADD STANDBY LOGFILE 'srl3.f' SIZE 52428800;

ALTER DATABASE ADD STANDBY LOGFILE 'srl4.f' SIZE 52428800;

Archivelog for thread 1 sequence 127 required for standby recovery

Switchover: Primary controlfile converted to standby controlfile succesfully.

Switchover: Complete - Database shutdown required

Completed: alter database commit to switchover to physical standby with session shutdown

Sun Jul 26 17:36:15 2015

Process (ospid 26918) is suspended due to switchover to physical standby operation.

 

 

Sun Jul 26 17:36:33 2015

Performing implicit shutdown abort due to switchover to physical standby

Shutting down instance (abort)

License high water mark = 7

USER (ospid: 37669): terminating the instance

Instance terminated by USER, pid = 37669

Sun Jul 26 17:36:35 2015

Instance shutdown complete

ORA-1092 : opitsk aborting process

Sun Jul 26 17:36:44 2015

Starting ORACLE instance (normal)

****************** Large Pages Information *****************

 

Total Shared Global Region in Large Pages = 0 KB (0%)

 

Large Pages used by this instance: 0 (0 KB)

Large Pages unused system wide = 0 (0 KB) (alloc incr 4096 KB)

Large Pages configured system wide = 0 (0 KB)

Large Page size = 2048 KB

 

RECOMMENDATION:

  Total Shared Global Region size is 314 MB. For optimal performance,

  prior to the next instance restart increase the number

  of unused Large Pages by atleast 157 2048 KB Large Pages (314 MB)

  system wide to get 100% of the Shared

  Global Region allocated with Large pages

***********************************************************

LICENSE_MAX_SESSION = 0

LICENSE_SESSIONS_WARNING = 0

Picked latch-free SCN scheme 3

Autotune of undo retention is turned on.

IMODE=BR

ILAT =27

LICENSE_MAX_USERS = 0

SYS auditing is disabled

Starting up:

Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options.

ORACLE_HOME = /u01/app/oracle/product/11.2.0/dbhome_1

System name:    Linux

Node name:      rhel6_lhr

Release:        2.6.32-504.16.2.el6.x86_64

Version:        #1 SMP Tue Apr 21 08:37:59 PDT 2015

Machine:        x86_64

VM name:        VMWare Version: 6

Using parameter settings in server-side spfile /u01/app/oracle/product/11.2.0/dbhome_1/dbs/spfileoradg11g.ora

System parameters with non-default values:

  processes                = 150

  sga_target               = 312M

  control_files            = "/u01/app/oracle/oradata/oradg11g/control01.ctl"

  control_files            = "/u01/app/oracle/flash_recovery_area/oradg11g/control02.ctl"

  db_file_name_convert     = "oradgphy"

  db_file_name_convert     = "oradg11g"

  log_file_name_convert    = "oradgphy"

  log_file_name_convert    = "oradg11g"

  db_block_size            = 8192

  compatible               = "11.2.0.0.0"

  log_archive_dest_1       = "LOCATION=USE_DB_RECOVERY_FILE_DEST db_unique_name=oradg11g valid_for=(ALL_LOGFILES,ALL_ROLES)"

  log_archive_dest_2       = "SERVICE=tns_oradgphy LGWR ASYNC db_unique_name=oradgphy valid_for=(ONLINE_LOGFILES,PRIMARY_ROLE)"

  log_archive_dest_3       = "SERVICE=tns_oradglg LGWR ASYNC db_unique_name=oradglg valid_for=(ONLINE_LOGFILES,PRIMARY_ROLE)"

  log_archive_dest_4       = "SERVICE=tns_oradgss LGWR ASYNC db_unique_name=oradgss valid_for=(ONLINE_LOGFILES,PRIMARY_ROLE)"

  log_archive_dest_state_1 = "ENABLE"

  log_archive_dest_state_2 = "ENABLE"

  log_archive_dest_state_3 = "defer"

  log_archive_dest_state_4 = "defer"

  fal_client               = "oradg11g"

  fal_server               = "oradgphy"

  log_archive_config       = "DG_CONFIG=(oradg11g,oradgphy,oradglg,oradgss)"

  log_archive_max_processes= 6

  db_recovery_file_dest    = "/u01/app/oracle/flash_recovery_area"

  db_recovery_file_dest_size= 4122M

  standby_file_management  = "AUTO"

  undo_tablespace          = "UNDOTBS1"

  remote_login_passwordfile= "EXCLUSIVE"

  db_domain                = ""

  dispatchers              = "(PROTOCOL=TCP) (SERVICE=oradg11gXDB)"

  audit_file_dest          = "/u01/app/oracle/admin/oradg11g/adump"

  audit_trail              = "DB"

  db_name                  = "oradg11g"

  db_unique_name           = "oradg11g"

  open_cursors             = 300

  pga_aggregate_target     = 78M

  diagnostic_dest          = "/u01/app/oracle"

Sun Jul 26 17:36:45 2015

PMON started with pid=2, OS id=37709

Sun Jul 26 17:36:45 2015

PSP0 started with pid=3, OS id=37711

Sun Jul 26 17:36:46 2015

VKTM started with pid=4, OS id=37713 at elevated priority

VKTM running at (1)millisec precision with DBRM quantum (100)ms

Sun Jul 26 17:36:46 2015

GEN0 started with pid=5, OS id=37717

Sun Jul 26 17:36:46 2015

 

 

这一步容易出现问题,注意下边的问题:

alter database commit to switchover to physical standby with session shutdown;

稍等。。。。等待数据库挂掉后再启动到mount,千万别shutdown immediate,应该用shutdown abort,等待告警日志中出现如下提示再进行下一步操作,否则可能导致switchover切换失败,主库将不可用

--Switchover: Primary controlfile converted to standby controlfile succesfully.

--Switchover: Complete - Database shutdown required

--Completed: alter database commit to switchover to physical standby with session shutdown

--Sun Jul 26 17:36:15 2015

--Process (ospid 26918) is suspended due to switchover to physical standby operation.

 

 

 

1.4.2.3  备库oradgphy执行切换

[oracle@rhel6_lhr admin]$ echo $ORACLE_SID

oradgphy

[oracle@rhel6_lhr admin]$ sqlplus / as sysdba

 

SQL*Plus: Release 11.2.0.3.0 Production on 星期日 7月 26 17:40:24 2015

 

Copyright (c) 1982, 2011, Oracle.  All rights reserved.

 

 

连接到:

Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options

 

17:40:24 SQL> select name, LOG_MODE, OPEN_MODE, database_role, SWITCHOVER_STATUS, db_unique_name from v$database;

 

NAME      LOG_MODE     OPEN_MODE            DATABASE_ROLE    SWITCHOVER_STATUS    DB_UNIQUE_NAME

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

ORADG11G  ARCHIVELOG   READ ONLY WITH APPLY PHYSICAL STANDBY TO PRIMARY           oradgphy

 

已用时间:  00: 00: 00.01

17:40:28 SQL> alter database commit to switchover to primary with session shutdown;

 

数据库已更改。

 

已用时间:  00: 00: 02.07

17:40:44 SQL> select name, LOG_MODE, OPEN_MODE, database_role, SWITCHOVER_STATUS, db_unique_name from v$database;

 

NAME      LOG_MODE     OPEN_MODE            DATABASE_ROLE    SWITCHOVER_STATUS    DB_UNIQUE_NAME

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

ORADG11G  ARCHIVELOG   MOUNTED             PRIMARY          NOT ALLOWED          oradgphy

 

已用时间:  00: 00: 00.01

17:40:56 SQL>

17:42:47 SQL> alter database open;

 

数据库已更改。

 

已用时间:  00: 00: 01.88

17:43:04 SQL>

 

告警日志:

Sun Jul 26 17:40:42 2015

alter database commit to switchover to primary with session shutdown

ALTER DATABASE SWITCHOVER TO PRIMARY (oradgphy)

Maximum wait for role transition is 15 minutes.

Switchover: Media recovery is still active

Role Change: Canceling MRP - no more redo to apply

Sun Jul 26 17:40:44 2015

MRP0: Background Media Recovery cancelled with status 16037

Errors in file /u01/app/oracle/diag/rdbms/oradgphy/oradgphy/trace/oradgphy_pr00_28229.trc:

ORA-16037: user requested cancel of managed recovery operation

Managed Standby Recovery not using Real Time Apply

Recovery interrupted!

Sun Jul 26 17:40:44 2015

MRP0: Background Media Recovery process shutdown (oradgphy)

Role Change: Canceled MRP

All dispatchers and shared servers shutdown

CLOSE: killing server sessions.

CLOSE: all sessions shutdown successfully.

Sun Jul 26 17:40:44 2015

SMON: disabling cache recovery

Backup controlfile written to trace file /u01/app/oracle/diag/rdbms/oradgphy/oradgphy/trace/oradgphy_ora_37868.trc

SwitchOver after complete recovery through change 1711983

Online log /u01/app/oracle/oradata/oradgphy/redo01.log: Thread 1 Group 1 was previously cleared

Online log /u01/app/oracle/oradata/oradgphy/redo02.log: Thread 1 Group 2 was previously cleared

Online log /u01/app/oracle/oradata/oradgphy/redo03.log: Thread 1 Group 3 was previously cleared

Standby became primary SCN: 1711981

AUDIT_TRAIL initialization parameter is changed back to its original value as specified in the parameter file.

Switchover: Complete - Database mounted as primary

Completed: alter database commit to switchover to primary with session shutdown

Sun Jul 26 17:41:14 2015

idle dispatcher 'D000' terminated, pid = (17, 1)

 

1.4.2.4  新备库oradg11g开启实时应用

[oracle@rhel6_lhr ~]$ echo $ORACLE_SID

oradg11g

[oracle@rhel6_lhr ~]$ sqlplus / as sysdba

 

SQL*Plus: Release 11.2.0.3.0 Production on 星期日 7月 26 17:45:47 2015

 

Copyright (c) 1982, 2011, Oracle.  All rights reserved.

 

 

连接到:

Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options

 

17:45:47 SQL>  select name, LOG_MODE, OPEN_MODE, database_role, SWITCHOVER_STATUS, db_unique_name from v$database;

 

NAME      LOG_MODE     OPEN_MODE            DATABASE_ROLE    SWITCHOVER_STATUS    DB_UNIQUE_NAME

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

ORADG11G  ARCHIVELOG   MOUNTED             PHYSICAL STANDBY RECOVERY NEEDED      oradg11g

 

已用时间:  00: 00: 00.01

17:45:53 SQL> alter database recover managed standby database using current logfile disconnect;

 

数据库已更改。

 

已用时间:  00: 00: 06.02

17:46:13 SQL> alter database recover managed standby database cancel;

 

数据库已更改。

 

已用时间:  00: 00: 01.48

17:46:16 SQL> alter database open;

 

数据库已更改。

 

已用时间:  00: 00: 00.56

17:46:21 SQL> alter database recover managed standby database using current logfile disconnect;

 

数据库已更改。

 

已用时间:  00: 00: 06.02

17:46:35 SQL>

 

1.4.2.5  测试切换后的情况

 

17:47:42 SQL> select name, LOG_MODE, OPEN_MODE, database_role, SWITCHOVER_STATUS, db_unique_name from v$database;

 

NAME      LOG_MODE     OPEN_MODE            DATABASE_ROLE    SWITCHOVER_STATUS    DB_UNIQUE_

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

ORADG11G  ARCHIVELOG   READ WRITE           PRIMARY          TO STANDBY           oradgphy

 

已用时间:  00: 00: 00.00

17:47:54 SQL> create table test as select * from scott.emp;

 

表已创建。

 

已用时间:  00: 00: 00.86

17:48:21 SQL> select count(1) from test;

 

  COUNT(1)

----------

        14

 

已用时间:  00: 00: 00.00

17:50:27 SQL>

17:50:27 SQL> conn sys/lhr@tns_oradg11g as sysdba

已连接。

17:50:42 SQL> select count(1) from test;

 

  COUNT(1)

----------

        14

 

已用时间:  00: 00: 00.01

17:50:46 SQL> conn sys/lhr@tns_oradgphy as sysdba

已连接。

17:51:08 SQL> drop table test;

 

表已删除。

 

已用时间:  00: 00: 01.14

17:51:13 SQL> conn sys/lhr@tns_oradgphy as sysdba

已连接。

17:51:17 SQL> conn sys/lhr@tns_oradg11g as sysdba

已连接。

17:51:21 SQL> select count(1) from test;

select count(1) from test

                     *

第 1 行出现错误:

ORA-00942: 表或视图不存在

 

 

已用时间:  00: 00: 00.00

17:51:24 SQL>

1.4.2.6  切换回原来最初的状态

新主库ordgphy操作:

 

20:28:43 SQL> alter database commit to switchover to physical standby with session shutdown;

 

数据库已更改。

 

已用时间:  00: 00: 04.65

20:30:01 SQL> shutdown immediate

ORA-01092: ORACLE instance terminated. Disconnection forced

20:30:33 SQL> startup  mount;

ORA-24324: 未初始化服务句柄

ORA-01041: 内部错误, hostdef 扩展名不存在

20:30:41 SQL> exit

从 Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options 断开

[oracle@rhel6_lhr admin]$ sqlplus / as sysdba

 

SQL*Plus: Release 11.2.0.3.0 Production on 星期日 7月 26 20:30:45 2015

 

Copyright (c) 1982, 2011, Oracle.  All rights reserved.

 

已连接到空闲例程。

 

20:30:45 SQL> startup  mount;

ORACLE 例程已经启动。

 

Total System Global Area  242171904 bytes

Fixed Size                  2227256 bytes

Variable Size             188744648 bytes

Database Buffers           46137344 bytes

Redo Buffers                5062656 bytes

数据库装载完毕。

 

新备库oradg11g操作:

20:28:46 SQL> select name, LOG_MODE, OPEN_MODE, database_role, SWITCHOVER_STATUS, db_unique_name from v$database;

 

NAME      LOG_MODE     OPEN_MODE            DATABASE_ROLE    SWITCHOVER_STATUS    DB_UNIQUE_NAME

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

ORADG11G  ARCHIVELOG   READ ONLY WITH APPLY PHYSICAL STANDBY TO PRIMARY           oradg11g

 

已用时间:  00: 00: 00.01

20:31:20 SQL> alter database commit to switchover to primary with session shutdown;

 

数据库已更改。

 

已用时间:  00: 00: 02.07

20:31:32 SQL> alter database open;

 

数据库已更改。

 

已用时间:  00: 00: 00.34

20:31:38 SQL> select name, LOG_MODE, OPEN_MODE, database_role, SWITCHOVER_STATUS, db_unique_name from v$database;

 

NAME      LOG_MODE     OPEN_MODE            DATABASE_ROLE    SWITCHOVER_STATUS    DB_UNIQUE_NAME

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

ORADG11G  ARCHIVELOG   READ WRITE           PRIMARY          RESOLVABLE GAP       oradg11g

 

已用时间:  00: 00: 00.00

 

 

oradgphy 操作:

20:30:54 SQL> alter database recover managed standby database using current logfile disconnect;

 

数据库已更改。

 

已用时间:  00: 00: 06.04

20:32:23 SQL> alter database recover managed standby database cancel;

 

数据库已更改。

 

已用时间:  00: 00: 01.01

20:32:36 SQL> alter database open;

 

数据库已更改。

 

已用时间:  00: 00: 00.21

20:32:42 SQL> alter database recover managed standby database using current logfile disconnect;

 

 

数据库已更改。

 

已用时间:  00: 00: 06.02

20:32:53 SQL> 20:32:53 SQL>  select name, LOG_MODE, OPEN_MODE, database_role, SWITCHOVER_STATUS, db_unique_name from v$database;

 

NAME      LOG_MODE     OPEN_MODE            DATABASE_ROLE    SWITCHOVER_STATUS    DB_UNIQUE_NAME

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

ORADG11G  ARCHIVELOG   READ ONLY WITH APPLY PHYSICAL STANDBY NOT ALLOWED          oradgphy

 

已用时间:  00: 00: 00.00

20:33:21 SQL>

 

OK,切换完成。

 

 

 

1.4.3  实验总结

 

切换过程中尤其注意主库执行alter database commit to switchover to physical standby with session shutdown;后需要等待数据库abort掉,或者我们手动的shutdown abort,否则可能导致实验失败,主库脱离dg环境不可用从而变为了failover切换了,所以实验之前还是对主库做rman备份比较稳妥一些。

 

 

1.5  总结

 

进行Dataguard switchoverfailover是非常常见的运维需求,在实际场景下,我们尽可能选择稳妥完全的策略进行操作SQL命令还是我们比较好的选择多操作几次就熟悉了

 

 

 





About Me

.............................................................................................................................................

● 本文作者:小麦苗,只专注于数据库的技术,更注重技术的运用

● 本文在itpub(http://blog.itpub.net/26736162/abstract/1/)、博客园(http://www.cnblogs.com/lhrbest)和个人微信公众号(xiaomaimiaolhr)上有同步更新

● 本文itpub地址:http://blog.itpub.net/26736162/viewspace-1753111/

● 本文博客园地址:http://www.cnblogs.com/lhrbest

● 本文pdf版、个人简介及小麦苗云盘地址:http://blog.itpub.net/26736162/viewspace-1624453/

● 数据库笔试面试题库及解答:http://blog.itpub.net/26736162/viewspace-2134706/

● DBA宝典今日头条号地址:http://www.toutiao.com/c/user/6401772890/#mid=1564638659405826

.............................................................................................................................................

● QQ群号:230161599(满)、618766405

● 微信群:可加我微信,我拉大家进群,非诚勿扰

● 联系我请加QQ好友646634621,注明添加缘由

● 于 2015-07-26 09:00~ 2015-07-27 19:00 在魔都完成

● 文章内容来源于小麦苗的学习笔记,部分整理自网络,若有侵权或不当之处还请谅解

● 版权所有,欢迎分享本文,转载请保留出处

.............................................................................................................................................

小麦苗的微店https://weidian.com/s/793741433?wfr=c&ifr=shopdetail

小麦苗出版的数据库类丛书http://blog.itpub.net/26736162/viewspace-2142121/

.............................................................................................................................................

使用微信客户端扫描下面的二维码来关注小麦苗的微信公众号(xiaomaimiaolhr)及QQ群(DBA宝典),学习最实用的数据库技术。

   小麦苗的微信公众号      小麦苗的DBA宝典QQ群1     小麦苗的DBA宝典QQ群2        小麦苗的微店

.............................................................................................................................................


DBA笔试面试讲解群1
DBA笔试面试讲解群2
欢迎与我联系



来自 “ ITPUB博客 ” ,链接:http://blog.itpub.net/28628435/viewspace-1984357/,如需转载,请注明出处,否则将追究法律责任。

请登录后发表评论 登录
全部评论

注册时间:2016-01-30

  • 博文量
    120
  • 访问量
    27001