物理DG在主库丢失归档文件的情况下的恢复

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物理dg在主库丢失归档文件的情况下的恢复
前言部分
导读
实验环境介绍
本文简介
相关知识点扫盲
实验部分
实验目标
实验过程
实验总结
总结
相关文章

物理dg在主库丢失归档文件的情况下的恢复

前言部分

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~：

① 物理dg的在主库丢失归档文件的情况下的恢复

② 物理dg管理和维护的一些sql

实验环境介绍

项目主库dg库
db 类型单实例单实例
db version11.2.0.311.2.0.3
db 存储FS typeFS type
ORACLE_SIDoradg11goradgphy
db_nameoradg11goradg11g
主机IP地址：192.168.59.130192.168.59.130
OS版本及kernel版本RHEL6.5 64位，2.6.32-504.16.2.el6.x86_64RHEL6.5 64位，2.6.32-504.16.2.el6.x86_64
OS hostnamerhel6_lhrrhel6_lhr

本文简介

最近由于合同到期，去面试了几家做oracle dba的工作，面试中出现了不少的问题，有的面试官太奇葩了，问的问题也比较难以回答，可怜我的表达能力不太好，俗话就是说不会忽悠人，因此面试连连碰壁，这也是哥的软肋，本来哥的技术已经很好的了，一般的DBA的活一点问题都没有，可面试就是不能通过，最近真的是身心俱创，不说了，说多了都是泪，这篇blog是基于我去1号店面试的时候面试官提的一个问题，当时隐约觉得有什么办法可以恢复，但是想不起来，结果就回答只能重建了，回来后搜了搜资料还是可以恢复的，趁着周末就实验了一番，今天贴出来给大家共享共享。

相关知识点扫盲

都是DG的一些基本维护知识，这里就不贴了，直接进入实验环节吧。

Using RMAN Incremental Backups to Refresh a Standby Database

You can create an incremental backup of the target database containing changes to the database since the creation of the duplicate or the previous syncrhonization. You can apply the incremental backup to the standby database.

Note:

This technique cannot be used to update a duplicate database.

RMAN enables you to synchronize a standby database with a primary database by creating an incremental backup at the source database that contains all changed blocks since the duplicate was created or last refreshed. You then apply the incremental backup to the standby database, which updates it with all changes.

This capability facilitates the temporary conversion of a physical standby database into a reporting database, as described in Oracle Data Guard Concepts and Administration. In particular, this capability makes it possible to reverse the effects of converting the standby into a reporting database. After the standby database has been used for reporting or testing, Flashback Database can reverse any changes resulting from that work, returning the database to its contents when it was still a standby. An incremental backup created with BACKUP INCREMENTAL... FROM SCN can be used to refresh the standby with changes at the primary since the conversion and then managed recovery can resume. The effect is to return the reporting database to its role as standby.

For more details on this scenario, see Oracle Data Guard Concepts and Administration.

Using BACKUP INCREMENTAL... FROM SCN

The incremental backup is created at the source database by means of the BACKUP INCREMENTAL FROM SCN=n form of the BACKUP command. For example:

BACKUP DEVICE TYPE SBT INCREMENTAL FROM SCN 750923 DATABASE;
BACKUP INCREMENTAL FROM SCN 750923 DATABASE;
BACKUP DEVICE TYPE DISK INCREMENTAL FROM SCN 750983 DATABASE
FORMAT '/tmp/incrstandby%U';

RMAN uses the selected SCN as the basis for this incremental backup. For all files being backed up, RMAN includes all data blocks that were changed at SCNs greater than or equal to the FROM SCN in the incremental backup.

Note:

  • RMAN does not consider the incremental backup as part of a backup strategy at the source database. The backup is not suitable for use in a normal RECOVER DATABASE operation at the source database.
  • The backup sets produced by this command are written to ?/dbs by default, even if the flash recovery area or some other backup destination is defined as the default for disk backups.
  • You must create this incremental backup on disk for it to be useful. When you move the incremental backup to the standby, you must catalog it at the standby as described in "Step 3: Catalog the Incremental Backup Files at the Standby Database". Backups on tape cannot be cataloged.

See Also:

《Oracle Database Backup and Recovery Reference 》 for more details on BACKUP command syntax

Refreshing a Standby Database With INCREMENTAL FROM SCN Backups: Example

This example shows the steps required to update a standby database using incremental backups. The assumption is that you have already activated the standby, performed your tests or other operations at the standby, and then used Flashback Database to undo the effects of those changes. The task here is to refresh the standby with the latest changes to the primary, so that it can resume its role as a standby database.

Step 1: Create the Incremental Backup

Create the needed incremental backup at the source database, using BACKUP with the INCREMENTAL FROM SCN clause.

Assume that the incremental backup to be used in updating the duplicate database is to be created on disk, with the filenames for backup pieces determined by the format /tmp/incr_forstandby/bkup%U.

RMAN> BACKUP DEVICE TYPE DISK INCREMENTAL FROM SCN 750983 DATABASE
FORMAT '/tmp/incr_forstandby/bkup%U';

Step 2: Make the Incremental Backup Accessible at the Standby Database

Make the backup pieces containing the incremental backup available in some directory accessible on the system containing the standby database. For this example, assume that the destination directory is called /standbydisk1/incrback/ and ensure that it contains nothing besides the incremental backups from Step 1.

Step 3: Catalog the Incremental Backup Files at the Standby Database

Use the RMAN CATALOG command to register the backup sets in the RMAN repository at the duplicate. With an RMAN client connected to the standby database and the recovery catalog (if you use one at the standby), mount the standby and run the following command:

RMAN> CATALOG START WITH '/standbydisk1/incrback/';

The backups are now available for use in recovery of the standby.

Step 4: Apply the Incremental Backup to the Standby Database

Use the RMAN RECOVER command with the NOREDO option to apply the incremental backup to the standby database. All changed blocks captured in the incremental backup are updated at the standby database, bringing it up to date with the primary database. With an RMAN client connected to the standby database, run the following command:

RMAN> RECOVER DATABASE NOREDO;

You can now resume managed recovery at the standby. Any redo logs required at the standby with changes since those contained in the incremental are automatically requested from the primary and applied

实验部分

实验目标

  1. 主库丢失归档文件，然后在不重建物理dg的情况下来恢复物理dg

实验过程

主备库环境

主库：

20:39:41 SQL> select dbid,name,current_scn,protection_mode,protection_level,database_role,force_logging,open_mode,switchover_status from v$database;

DBID NAME CURRENT_SCN PROTECTION_MODE PROTECTION_LEVEL DATABASE_ROLE FOR OPEN_MODE SWITCHOVER_STATUS

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

1403587593 ORADG11G 2240299 MAXIMUM PERFORMANCE MAXIMUM PERFORMANCE PRIMARY YES READ WRITE TO STANDBY

已用时间: 00: 00: 00.01

20:39:42 SQL>

20:42:29 SQL> archive log list;

数据库日志模式 存档模式

自动存档 启用

存档终点 USE_DB_RECOVERY_FILE_DEST

最早的联机日志序列 47

下一个存档日志序列 49

当前日志序列 49

20:43:02 SQL>

备库：

20:40:39 SQL> select dbid,name,current_scn,protection_mode,protection_level,database_role,force_logging,open_mode,switchover_status from v$database;

DBID NAME CURRENT_SCN PROTECTION_MODE PROTECTION_LEVEL DATABASE_ROLE FOR OPEN_MODE SWITCHOVER_STATUS

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

1403587593 ORADG11G 2240295 MAXIMUM PERFORMANCE MAXIMUM PERFORMANCE PHYSICAL STANDBY YES READ ONLY WITH APPLY NOT ALLOWED

已用时间: 00: 00: 00.06

20:40:44 SQL>

20:42:23 SQL> archive log list;

数据库日志模式 存档模式

自动存档 启用

存档终点 USE_DB_RECOVERY_FILE_DEST

最早的联机日志序列 47

下一个存档日志序列 0

当前日志序列 49

20:43:23 SQL>

模拟归档丢失

备库操作，备库取消归档应用，让备库处于只读模式：

20:43:23 SQL> ALTER DATABASE recover managed standby DATABASE cancel;

数据库已更改。

已用时间: 00: 00: 01.00

20:44:39 SQL>

20:44:39 SQL> select dbid,name,current_scn,protection_mode,protection_level,database_role,force_logging,open_mode,switchover_status from v$database;

DBID NAME CURRENT_SCN PROTECTION_MODE PROTECTION_LEVEL DATABASE_ROLE FOR OPEN_MODE SWITCHOVER_STATUS

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

1403587593 ORADG11G 2240536 MAXIMUM PERFORMANCE MAXIMUM PERFORMANCE PHYSICAL STANDBY YES READ ONLY NOT ALLOWED

已用时间: 00: 00: 00.00

20:45:09 SQL>

主库配置归档2的状态为defer，目的是为了不把归档自动传递到备库,实际情况下往往是由于网络故障，备库挂掉等等情况导致，我们多次切换主库日志：

20:50:48 SQL> ALTER system SET log_archive_dest_state_2 = 'defer';

系统已更改。

已用时间: 00: 00: 00.01

20:52:31 SQL>

20:52:31 SQL> alter system switch logfile;

系统已更改。

已用时间: 00: 00: 00.01

20:54:54 SQL> alter system switch logfile;

系统已更改。

已用时间: 00: 00: 00.03

20:54:56 SQL> alter system switch logfile;

系统已更改。

已用时间: 00: 00: 00.01

20:54:57 SQL> alter system switch logfile;

系统已更改。

已用时间: 00: 00: 00.01

20:55:05 SQL> alter system switch logfile;

系统已更改。

已用时间: 00: 00: 00.00

20:55:45 SQL> create table lhr.testdg as select * from dual;

表已创建。

已用时间: 00: 00: 00.10

20:55:49 SQL> insert into lhr.testdg select * from dual;

已创建 1 行。

已用时间: 00: 00: 00.01

20:56:10 SQL> commit;

提交完成。

已用时间: 00: 00: 00.00

20:56:43 SQL> alter system switch logfile;

系统已更改。

已用时间: 00: 00: 00.01

20:56:52 SQL> alter system switch logfile;

系统已更改。

已用时间: 00: 00: 00.01

20:56:56 SQL> insert into lhr.testdg select * from dual;

已创建 1 行。

已用时间: 00: 00: 00.00

20:57:07 SQL> commit;

提交完成。

已用时间: 00: 00: 00.00

20:57:11 SQL> alter system switch logfile;

系统已更改。

已用时间: 00: 00: 01.57

20:57:15 SQL>

20:57:15 SQL> select * from lhr.testdg;

D

-

X

X

X

已用时间: 00: 00: 00.00

20:58:00 SQL>

20:58:00 SQL> archive log list;

数据库日志模式 存档模式

自动存档 启用

存档终点 USE_DB_RECOVERY_FILE_DEST

最早的联机日志序列 55

下一个存档日志序列 57

当前日志序列 57

20:58:30 SQL>

查看主库归档情况：

20:58:30 SQL> col name for a100

20:58:55 SQL> set linesize 9999 pagesize 9999

20:58:55 SQL> SELECT dest_id,

20:58:55 2 THREAD#,

20:58:55 3 NAME,

sequence#,

archived,

applied,

a.NEXT_CHANGE#

FROM v$archived_log a

WHERE a.sequence# >= 40

AND resetlogs_change# = (SELECT d.RESETLOGS_CHANGE# FROM v$database d)

and a.dest_id=1

ORDER BY a.THREAD#,

a.sequence#,

20:58:55 14 a.dest_id;

DEST_ID THREAD# NAME SEQUENCE# ARC APPLIED NEXT_CHANGE#

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

1 1 40 YES NO 2181533

1 1 41 YES NO 2181856

1 1 42 YES NO 2182794

1 1 43 YES NO 2182842

1 1 44 YES NO 2223480

1 1 45 YES NO 2223488

1 1 /u01/app/oracle/flash_recovery_area/ORADG11G/archivelog/2015_08_23/o1_mf_1_46bxm58pvo.arc 46 YES NO 2224321

1 1 /u01/app/oracle/flash_recovery_area/ORADG11G/archivelog/2015_08_23/o1_mf_1_47bxmc8z90.arc 47 YES NO 2234639

1 1 /u01/app/oracle/flash_recovery_area/ORADG11G/archivelog/2015_08_23/o1_mf_1_48bxmc917l.arc 48 YES NO 2234642

1 1 /u01/app/oracle/flash_recovery_area/ORADG11G/archivelog/2015_08_23/o1_mf_1_49bxmjnyoh.arc 49 YES NO 2241189

1 1 /u01/app/oracle/flash_recovery_area/ORADG11G/archivelog/2015_08_23/o1_mf_1_50bxmjo0gk.arc 50 YES NO 2241194

1 1 /u01/app/oracle/flash_recovery_area/ORADG11G/archivelog/2015_08_23/o1_mf_1_51bxmjo1vw.arc 51 YES NO 2241198

1 1 /u01/app/oracle/flash_recovery_area/ORADG11G/archivelog/2015_08_23/o1_mf_1_52bxmjo9pw.arc 52 YES NO 2241209

1 1 /u01/app/oracle/flash_recovery_area/ORADG11G/archivelog/2015_08_23/o1_mf_1_53bxmjocqc.arc 53 YES NO 2241214

1 1 /u01/app/oracle/flash_recovery_area/ORADG11G/archivelog/2015_08_23/o1_mf_1_54bxmjrnt2.arc 54 YES NO 2241390

1 1 /u01/app/oracle/flash_recovery_area/ORADG11G/archivelog/2015_08_23/o1_mf_1_55bxmjrrbl.arc 55 YES NO 2241396

1 1 /u01/app/oracle/flash_recovery_area/ORADG11G/archivelog/2015_08_23/o1_mf_1_56bxmjscy0.arc 56 YES NO 2241419

已选择17行。

已用时间: 00: 00: 00.00

20:58:56 SQL>

查看备库归档情况：

20:59:04 SQL> col name for a100

21:00:45 SQL> set linesize 9999 pagesize 9999

21:00:45 SQL> SELECT dest_id,

21:00:45 2 THREAD#,

21:00:45 3 NAME,

21:00:45 4 sequence#,

21:00:45 5 archived,

21:00:45 6 applied,

21:00:45 7 a.NEXT_CHANGE#

21:00:45 8 FROM v$archived_log a

21:00:45 9 WHERE a.sequence# >= 45

21:00:45 10 AND resetlogs_change# = (SELECT d.RESETLOGS_CHANGE# FROM v$database d)

21:00:45 11 and a.dest_id=1

21:00:45 12 ORDER BY a.THREAD#,

21:00:45 13 a.sequence#,

21:00:45 14 a.dest_id;

DEST_ID THREAD# NAME SEQUENCE# ARC APPLIED NEXT_CHANGE#

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

1 1 46 YES YES 2224321

1 1 47 YES YES 2234639

1 1 /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_48bxmc9189.arc 48 YES YES 2234642

1 1 /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_49bxmjnyj3.arc 49 YES NO 2241189

已用时间: 00: 00: 00.01

21:00:46 SQL>

可以看到，备库已经断档了，50到56都没有接收，接下来我们删除主库的归档日志，我们只删除54、55这2个归档日志：

[oracle@rhel6_lhr ~]$ cd /u01/app/oracle/flash_recovery_area/ORADG11G/archivelog/2015_08_23

[oracle@rhel6_lhr 2015_08_23]$ ls

o1_mf_1_46bxm58pvo.arc o1_mf_1_48bxmc917l.arc o1_mf_1_50bxmjo0gk.arc o1_mf_1_52bxmjo9pw.arc o1_mf_1_54bxmjrnt2.arc o1_mf_1_56bxmjscy0.arc

o1_mf_1_47bxmc8z90.arc o1_mf_1_49bxmjnyoh.arc o1_mf_1_51bxmjo1vw.arc o1_mf_1_53bxmjocqc.arc o1_mf_1_55bxmjrrbl.arc

[oracle@rhel6_lhr 2015_08_23]$ ll

total 23624

-rw-r----- 1 oracle asmadmin 422400 Aug 23 17:40 o1_mf_1_46bxm58pvo.arc

-rw-r----- 1 oracle asmadmin 17354240 Aug 23 19:23 o1_mf_1_47bxmc8z90.arc

-rw-r----- 1 oracle asmadmin 1536 Aug 23 19:23 o1_mf_1_48bxmc917l.arc

-rw-r----- 1 oracle asmadmin 6266368 Aug 23 20:54 o1_mf_1_49bxmjnyoh.arc

-rw-r----- 1 oracle asmadmin 2048 Aug 23 20:54 o1_mf_1_50bxmjo0gk.arc

-rw-r----- 1 oracle asmadmin 1536 Aug 23 20:54 o1_mf_1_51bxmjo1vw.arc

-rw-r----- 1 oracle asmadmin 5120 Aug 23 20:55 o1_mf_1_52bxmjo9pw.arc

-rw-r----- 1 oracle asmadmin 2048 Aug 23 20:55 o1_mf_1_53bxmjocqc.arc

-rw-r----- 1 oracle asmadmin 96256 Aug 23 20:56 o1_mf_1_54bxmjrnt2.arc

-rw-r----- 1 oracle asmadmin 2560 Aug 23 20:56 o1_mf_1_55bxmjrrbl.arc

-rw-r----- 1 oracle asmadmin 12800 Aug 23 20:57 o1_mf_1_56bxmjscy0.arc

[oracle@rhel6_lhr 2015_08_23]$ rm -rf o1_mf_1_54*

[oracle@rhel6_lhr 2015_08_23]$ rm -rf o1_mf_1_55*

You have new mail in /var/spool/mail/oracle

[oracle@rhel6_lhr 2015_08_23]$ ll

total 23524

-rw-r----- 1 oracle asmadmin 422400 Aug 23 17:40 o1_mf_1_46bxm58pvo.arc

-rw-r----- 1 oracle asmadmin 17354240 Aug 23 19:23 o1_mf_1_47bxmc8z90.arc

-rw-r----- 1 oracle asmadmin 1536 Aug 23 19:23 o1_mf_1_48bxmc917l.arc

-rw-r----- 1 oracle asmadmin 6266368 Aug 23 20:54 o1_mf_1_49bxmjnyoh.arc

-rw-r----- 1 oracle asmadmin 2048 Aug 23 20:54 o1_mf_1_50bxmjo0gk.arc

-rw-r----- 1 oracle asmadmin 1536 Aug 23 20:54 o1_mf_1_51bxmjo1vw.arc

-rw-r----- 1 oracle asmadmin 5120 Aug 23 20:55 o1_mf_1_52bxmjo9pw.arc

-rw-r----- 1 oracle asmadmin 2048 Aug 23 20:55 o1_mf_1_53bxmjocqc.arc

-rw-r----- 1 oracle asmadmin 12800 Aug 23 20:57 o1_mf_1_56bxmjscy0.arc

[oracle@rhel6_lhr 2015_08_23]$

主库开启备库的归档：

21:05:44 SQL> ALTER system SET log_archive_dest_state_2 = 'enable';

系统已更改。

已用时间: 00: 00: 00.00

21:19:46 SQL>

备库开启实时应用：

21:00:46 SQL> alter database recover managed standby database using current logfile disconnect from session;

数据库已更改。

已用时间: 00: 00: 06.02

21:22:17 SQL>

此时备库告警日志：

Sun Aug 23 21:22:16 2015

Managed Standby Recovery starting Real Time Apply

Parallel Media Recovery started with 2 slaves

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

All non-current ORLs have been archived.

Media Recovery Log /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_49bxmjnyj3.arc

Media Recovery Log /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_50bxml3lv7.arc

Media Recovery Log /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_51bxml3lrh.arc

Media Recovery Log /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_52bxml3lqv.arc

Media Recovery Log /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_53bxml3lz7.arc

Media Recovery Waiting for thread 1 sequence 54

Fetching gap sequence in thread 1, gap sequence 54-55

Completed: alter database recover managed standby database using current logfile disconnect from session

Sun Aug 23 21:25:17 2015

Error 12154 received logging on to the standby

FAL[client, USER]: Error 12154 connecting to oradg11g for fetching gap sequence

Sun Aug 23 21:57:57 2015

FAL[client]: Failed to request gap sequence

GAP - thread 1 sequence 54-55

DBID 1403587593 branch 886695024

FAL[client]: All defined FAL servers have been attempted.

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

Check that the CONTROL_FILE_RECORD_KEEP_TIME initialization

parameter is defined to a value that's sufficiently large

enough to maintain adequate log switch information to resolve

archivelog gaps.

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

再次查看备库归档情况：

21:34:58 SQL>

21:36:10 SQL> col name for a100

21:37:40 SQL> set linesize 9999 pagesize 9999

21:37:40 SQL> SELECT dest_id,

21:37:40 2 THREAD#,

21:37:40 3 NAME,

21:37:40 4 sequence#,

21:37:40 5 archived,

21:37:41 6 applied,

21:37:41 7 a.NEXT_CHANGE#

21:37:41 8 FROM v$archived_log a

21:37:41 9 WHERE a.sequence# >= 45

21:37:41 10 AND resetlogs_change# = (SELECT d.RESETLOGS_CHANGE# FROM v$database d)

21:37:41 11 ORDER BY a.THREAD#,

21:37:41 12 a.sequence#,

21:37:41 13 a.dest_id;

DEST_ID THREAD# NAME SEQUENCE# ARC APPLIED NEXT_CHANGE#

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

2 1 45 YES YES 2223488

1 1 46 YES YES 2224321

1 1 47 YES YES 2234639

1 1 /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_48bxmc9189.arc 48 YES YES 2234642

1 1 /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_49bxmjnyj3.arc 49 YES YES 2241189

2 1 /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_50bxml3lv7.arc 50 YES YES 2241194

2 1 /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_51bxml3lrh.arc 51 YES YES 2241198

2 1 /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_52bxml3lqv.arc 52 YES YES 2241209

2 1 /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_53bxml3lz7.arc 53 YES YES 2241214

2 1 /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_56bxml3lz0.arc 56 YES NO 2241419

2 1 /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_57bxml3m03.arc 57 YES NO 2243353

已选择11行。

已用时间: 00: 00: 00.01

21:37:41 SQL>

21:40:35 SQL> select thread#,low_sequence#,high_sequence# from v$archive_gap;

THREAD# LOW_SEQUENCE# HIGH_SEQUENCE#

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

1 54 55

已用时间: 00: 00: 00.01

21:50:38 SQL>

可以看到备库已经产生gap了。

主库基于SCN备份

54、55号日志不见了，这个时候我们以53号的归档日志的next_change#即54号的first_change#为scn号来对主库基于scn的rman增量备份。

SELECT (SELECT MIN(d.CHECKPOINT_CHANGE#) FROM v$datafile d) datafile_scn,

(SELECT MIN(d.CHECKPOINT_CHANGE#)

FROM v$datafile_header d

WHERE rownum = 1) datafile_header_scn,

(SELECT current_scn FROM v$database) current_scn,

(SELECT b.NEXT_CHANGE#

FROM v$archived_log b

WHERE b.SEQUENCE# = 53

AND resetlogs_change# =

(SELECT d.RESETLOGS_CHANGE# FROM v$database d)

AND rownum = 1) NEXT_CHANGE#

FROM dual;

物理DG在主库丢失归档文件的情况下的恢复

这几个值基本上差不多，我们可以以 2241214 或者2241213为基准来备份，若是数据文件和文件头的scn不一致我们应该取这几个值中最小的一个。

run

{

allocate channel d1 type disk;

allocate channel d2 type disk;

backup as compressed backupset incremental from SCN 2241214 database format '/u05/oracle/oraclebk/ORADG11G/standby%d%T%U.bak' include current controlfile for standby filesperset=5 tag 'FOR STANDBY';

release channel d1;

release channel d2;

}

[oracle@rhel6_lhr ~]$ rman target /

恢复管理器: Release 11.2.0.3.0 - Production on 星期日 8月 23 21:55:49 2015

Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.

已连接到目标数据库: ORADG11G (DBID=1403587593)

RMAN> run

2> {

3> allocate channel d1 type disk;

4> allocate channel d2 type disk;

5> backup as compressed backupset incremental from SCN 2241214 database format '/u05/oracle/oraclebk/ORADG11G/standby%d%T%U.bak' include current controlfile for standby filesperset=5 tag 'FOR STANDBY';

6> release channel d1;

7> release channel d2;

8> }

使用目标数据库控制文件替代恢复目录

分配的通道: d1

通道 d1: SID=145 设备类型=DISK

分配的通道: d2

通道 d2: SID=19 设备类型=DISK

启动 backup 于 2015-08-23 21:55:54

备份将于 2015-08-30 21:55:54 废弃

将不保留或备份归档日志

通道 d1: 正在启动压缩的全部数据文件备份集

通道 d1: 正在指定备份集内的数据文件

输入数据文件: 文件号=00001 名称=/u01/app/oracle/oradata/oradg11g/system01.dbf

输入数据文件: 文件号=00003 名称=/u01/app/oracle/oradata/oradg11g/undotbs01.dbf

输入数据文件: 文件号=00005 名称=/u01/app/oracle/oradata/oradg11g/example01.dbf

通道 d1: 正在启动段 1 于 2015-08-23 21:55:54

通道 d2: 正在启动压缩的全部数据文件备份集

通道 d2: 正在指定备份集内的数据文件

输入数据文件: 文件号=00002 名称=/u01/app/oracle/oradata/oradg11g/sysaux01.dbf

输入数据文件: 文件号=00006 名称=/u01/app/oracle/oradata/oradg11g/logmnrtbs1.dbf

输入数据文件: 文件号=00004 名称=/u01/app/oracle/oradata/oradg11g/users01.dbf

通道 d2: 正在启动段 1 于 2015-08-23 21:55:54

通道 d2: 已完成段 1 于 2015-08-23 22:00:00

段句柄=/u05/oracle/oracle_bk/ORADG11G/standby_ORADG11G_20150823_2sqfbp7a_1_1.bak 标记=FOR STANDBY 注释=NONE

通道 d2: 备份集已完成, 经过时间:00:04:06

通道 d2: 正在启动压缩的全部数据文件备份集

通道 d2: 正在指定备份集内的数据文件

备份集内包括备用控制文件

通道 d2: 正在启动段 1 于 2015-08-23 22:00:03

通道 d2: 已完成段 1 于 2015-08-23 22:00:04

段句柄=/u05/oracle/oracle_bk/ORADG11G/standby_ORADG11G_20150823_2tqfbpf0_1_1.bak 标记=FOR STANDBY 注释=NONE

通道 d2: 备份集已完成, 经过时间:00:00:01

通道 d1: 已完成段 1 于 2015-08-23 22:00:54

段句柄=/u05/oracle/oracle_bk/ORADG11G/standby_ORADG11G_20150823_2rqfbp7a_1_1.bak 标记=FOR STANDBY 注释=NONE

通道 d1: 备份集已完成, 经过时间:00:05:00

备份将于 2015-08-30 22:00:54 废弃

将不保留或备份归档日志

通道 d1: 正在启动压缩的全部数据文件备份集

通道 d1: 正在指定备份集内的数据文件

备份集内包括当前控制文件

通道 d1: 正在启动段 1 于 2015-08-23 22:00:55

通道 d1: 已完成段 1 于 2015-08-23 22:00:56

段句柄=/u05/oracle/oracle_bk/ORADG11G/standby_ORADG11G_20150823_2uqfbpgm_1_1.bak 标记=FOR STANDBY 注释=NONE

通道 d1: 备份集已完成, 经过时间:00:00:01

完成 backup 于 2015-08-23 22:00:56

释放的通道: d1

释放的通道: d2

RMAN>

RMAN>

RMAN> list backupset summary;

备份列表

===============

关键字 TY LV S 设备类型 完成时间 段数 副本数 压缩标记

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

9 B A DISK 2015-08-23 21:59:53 1 1 YES FOR STANDBY

10 B A DISK 2015-08-23 22:00:04 1 1 YES FOR STANDBY

11 B A DISK 2015-08-23 22:00:49 1 1 YES FOR STANDBY

12 B A DISK 2015-08-23 22:00:55 1 1 YES FOR STANDBY

RMAN> exit

恢复管理器完成。

[oracle@rhel6_lhr ~]$ ll -h /u05/oracle/oracle_bk/ORADG11G/*

-rw-r----- 1 oracle asmadmin 1.2M Aug 23 22:00 /u05/oracle/oracle_bk/ORADG11G/standby_ORADG11G_20150823_2rqfbp7a_1_1.bak

-rw-r----- 1 oracle asmadmin 1.4M Aug 23 21:59 /u05/oracle/oracle_bk/ORADG11G/standby_ORADG11G_20150823_2sqfbp7a_1_1.bak

-rw-r----- 1 oracle asmadmin 1.1M Aug 23 22:00 /u05/oracle/oracle_bk/ORADG11G/standby_ORADG11G_20150823_2tqfbpf0_1_1.bak

-rw-r----- 1 oracle asmadmin 1.1M Aug 23 22:00 /u05/oracle/oracle_bk/ORADG11G/standby_ORADG11G_20150823_2uqfbpgm_1_1.bak

[oracle@rhel6_lhr ~]$

可以看到增量备份成功，接下来将备份传递到备库，可以用scp或者ftp工具， scp * oracle@192.168.213.101:/u05/oracle/oracle_bk/ORADG11G/。

[oracle@rhel6_lhr ~]$ scp /u05/oracle/oracle_bk/ORADG11G/* oracle@192.168.59.130:/u05/oracle/

The authenticity of host '192.168.59.130 (192.168.59.130)' can't be established.

RSA key fingerprint is 77:e6:11:1a:7c:c7:81:7c:88:c9:21:18:51:2a:84:d1.

Are you sure you want to continue connecting (yes/no)? yes

Warning: Permanently added '192.168.59.130' (RSA) to the list of known hosts.

oracle@192.168.59.130's password:

standby_ORADG11G_20150823_2rqfbp7a_1_1.bak 100% 1144KB 1.1MB/s 00:00

standby_ORADG11G_20150823_2sqfbp7a_1_1.bak 100% 1376KB 1.3MB/s 00:00

standby_ORADG11G_20150823_2tqfbpf0_1_1.bak 100% 1104KB 1.1MB/s 00:00

standby_ORADG11G_20150823_2uqfbpgm_1_1.bak 100% 1120KB 1.1MB/s 00:00

You have new mail in /var/spool/mail/oracle

[oracle@rhel6_lhr ~]$

备库执行恢复操作

重启备库到nomount状态来恢复控制文件

22:09:23 SQL> set line 9999

22:10:26 SQL> col name format a10

22:10:26 SQL> select dbid,name,current_scn,protection_mode,protection_level,database_role,force_logging,open_mode,switchover_status from v$database;

DBID NAME CURRENT_SCN PROTECTION_MODE PROTECTION_LEVEL DATABASE_ROLE FOR OPEN_MODE SWITCHOVER_STATUS

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

1403587593 ORADG11G 2241213 MAXIMUM PERFORMANCE MAXIMUM PERFORMANCE PHYSICAL STANDBY YES READ ONLY WITH APPLY NOT ALLOWED

已用时间: 00: 00: 00.01

22:11:41 SQL> create pfile='?/dbs/standby_pfile_before_recover_dg.ora' from spfile;

文件已创建。

已用时间: 00: 00: 00.01

22:12:29 SQL>

22:12:29 SQL> shutdown immediate;

数据库已经关闭。

已经卸载数据库。

ORACLE 例程已经关闭。

22:13:46 SQL> startup nomount;

ORACLE 例程已经启动。

Total System Global Area 242171904 bytes

Fixed Size 2227256 bytes

Variable Size 197133256 bytes

Database Buffers 37748736 bytes

Redo Buffers 5062656 bytes

22:13:56 SQL> show parameter control

NAME TYPE VALUE

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

control_file_record_keep_time integer 7

control_files string /u01/app/oracle/oradata/oradgp

hy/crontal01.ctl, /u01/app/ora

cle/oradata/oradgphy/control02

.ctl

control_management_pack_access string DIAGNOSTIC+TUNING

[oracle@rhel6_lhr ~]$ rman target /

恢复管理器: Release 11.2.0.3.0 - Production on 星期日 8月 23 22:30:24 2015

Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.

已连接到目标数据库: ORADG11G (未装载)

RMAN> restore standby controlfile to '/u01/app/oracle/oradata/oradgphy/crontal01.ctl' from '/u05/oracle/standby_ORADG11G_20150823_2tqfbpf0_1_1.bak';

启动 restore 于 2015-08-23 22:30:26

使用目标数据库控制文件替代恢复目录

分配的通道: ORA_DISK_1

通道 ORA_DISK_1: SID=134 设备类型=DISK

通道 ORA_DISK_1: 正在还原控制文件

通道 ORA_DISK_1: 还原完成, 用时: 00:00:01

完成 restore 于 2015-08-23 22:30:27

RMAN> restore standby controlfile to '/u01/app/oracle/oradata/oradgphy/control02.ctl' from '/u05/oracle/standby_ORADG11G_20150823_2tqfbpf0_1_1.bak';

启动 restore 于 2015-08-23 22:30:52

使用通道 ORA_DISK_1

通道 ORA_DISK_1: 正在还原控制文件

通道 ORA_DISK_1: 还原完成, 用时: 00:00:01

完成 restore 于 2015-08-23 22:30:53

RMAN>

RMAN> catalog start with '/u05/oracle/';

RMAN-00571: ===========================================================

RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============

RMAN-00571: ===========================================================

RMAN-03002: catalog 命令 (在 08/23/2015 22:33:07 上) 失败

ORA-01507: 未装载数据库

RMAN> alter database mount;

数据库已装载

释放的通道: ORA_DISK_1

RMAN> catalog start with '/u05/oracle/';

搜索与样式 /u05/oracle 匹配的所有文件

数据库未知文件的列表

=====================================

文件名: /u05/oracle/standby_ORADG11G_20150823_2rqfbp7a_1_1.bak

文件名: /u05/oracle/standby_ORADG11G_20150823_2sqfbp7a_1_1.bak

文件名: /u05/oracle/standby_ORADG11G_20150823_2uqfbpgm_1_1.bak

文件名: /u05/oracle/standby_ORADG11G_20150823_2tqfbpf0_1_1.bak

是否确实要将上述文件列入目录 (输入 YES 或 NO)? yes

正在编制文件目录...

目录编制完毕

已列入目录的文件的列表

=======================

文件名: /u05/oracle/standby_ORADG11G_20150823_2rqfbp7a_1_1.bak

文件名: /u05/oracle/standby_ORADG11G_20150823_2sqfbp7a_1_1.bak

文件名: /u05/oracle/standby_ORADG11G_20150823_2uqfbpgm_1_1.bak

文件名: /u05/oracle/standby_ORADG11G_20150823_2tqfbpf0_1_1.bak

恢复备库

RMAN> recover DATABASE noredo;

启动 recover 于 2015-08-23 22:37:12

使用通道 ORA_DISK_1

通道 ORA_DISK_1: 正在开始还原增量数据文件备份集

通道 ORA_DISK_1: 正在指定从备份集还原的数据文件

数据文件 00002 的还原目标: /u01/app/oracle/oradata/oradgphy/sysaux01.dbf

数据文件 00004 的还原目标: /u01/app/oracle/oradata/oradgphy/users01.dbf

数据文件 00006 的还原目标: /u01/app/oracle/oradata/oradgphy/logmnrtbs1.dbf

通道 ORA_DISK_1: 正在读取备份片段 /u05/oracle/oracle_bk/ORADG11G/standby_ORADG11G_20150823_2sqfbp7a_1_1.bak

通道 ORA_DISK_1: 段句柄 = /u05/oracle/oracle_bk/ORADG11G/standby_ORADG11G_20150823_2sqfbp7a_1_1.bak 标记 = FOR STANDBY

通道 ORA_DISK_1: 已还原备份片段 1

通道 ORA_DISK_1: 还原完成, 用时: 00:00:01

通道 ORA_DISK_1: 正在开始还原增量数据文件备份集

通道 ORA_DISK_1: 正在指定从备份集还原的数据文件

数据文件 00001 的还原目标: /u01/app/oracle/oradata/oradgphy/system01.dbf

数据文件 00003 的还原目标: /u01/app/oracle/oradata/oradgphy/undotbs01.dbf

数据文件 00005 的还原目标: /u01/app/oracle/oradata/oradgphy/example01.dbf

通道 ORA_DISK_1: 正在读取备份片段 /u05/oracle/standby_ORADG11G_20150823_2rqfbp7a_1_1.bak

通道 ORA_DISK_1: 段句柄 = /u05/oracle/standby_ORADG11G_20150823_2rqfbp7a_1_1.bak 标记 = FOR STANDBY

通道 ORA_DISK_1: 已还原备份片段 1

通道 ORA_DISK_1: 还原完成, 用时: 00:00:03

完成 recover 于 2015-08-23 22:37:16

RMAN>

告警日志：

Sun Aug 23 22:37:12 2015

Incremental restore complete of datafile 4 /u01/app/oracle/oradata/oradgphy/users01.dbf

checkpoint is 2245592

last deallocation scn is 3

Incremental restore complete of datafile 6 /u01/app/oracle/oradata/oradgphy/logmnrtbs1.dbf

checkpoint is 2245592

Incremental restore complete of datafile 2 /u01/app/oracle/oradata/oradgphy/sysaux01.dbf

checkpoint is 2245592

last deallocation scn is 995211

Incremental restore complete of datafile 3 /u01/app/oracle/oradata/oradgphy/undotbs01.dbf

checkpoint is 2245591

last deallocation scn is 3

Incremental restore complete of datafile 5 /u01/app/oracle/oradata/oradgphy/example01.dbf

checkpoint is 2245591

last deallocation scn is 1015098

Incremental restore complete of datafile 1 /u01/app/oracle/oradata/oradgphy/system01.dbf

checkpoint is 2245591

last deallocation scn is 993074

备库开始应用redo

[oracle@rhel6_lhr ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.3.0 Production on 星期日 8月 23 22:39:48 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

22:39:48 SQL> col name for a100

22:40:29 SQL> set linesize 9999 pagesize 9999

22:40:29 SQL> SELECT dest_id,

22:40:29 2 THREAD#,

22:40:29 3 NAME,

22:40:29 4 sequence#,

22:40:29 5 archived,

22:40:29 6 applied,

22:40:29 7 a.NEXT_CHANGE#

22:40:29 8 FROM v$archived_log a

22:40:29 9 WHERE a.sequence# >= 40

22:40:29 10 AND resetlogs_change# = (SELECT d.RESETLOGS_CHANGE# FROM v$database d)

22:40:29 11 ORDER BY a.THREAD#,

22:40:29 12 a.sequence#,

22:40:30 13 a.dest_id;

DEST_ID THREAD# NAME SEQUENCE# ARC APPLIED NEXT_CHANGE#

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

1 1 /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_48bxmc9189.arc 48 YES NO 2234642

1 1 /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_49bxmjnyj3.arc 49 YES NO 2241189

1 1 /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_50bxml3lv7.arc 50 YES NO 2241194

1 1 /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_51bxml3lrh.arc 51 YES NO 2241198

1 1 /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_52bxml3lqv.arc 52 YES NO 2241209

1 1 /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_53bxml3lz7.arc 53 YES NO 2241214

1 1 /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_56bxml3lz0.arc 56 YES NO 2241419

1 1 /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_57bxml3m03.arc 57 YES NO 2243353

1 1 /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_58bxmp464x.arc 58 YES NO 2248351

1 1 /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_59bxmpksob.arc 59 YES NO 2248782

已选择10行。

已用时间: 00: 00: 00.01

22:40:30 SQL> alter database recover managed standby database using current logfile disconnect from session;

数据库已更改。

已用时间: 00: 00: 06.02

22:41:19 SQL> col name for a100

22:41:40 SQL> set linesize 9999 pagesize 9999

22:41:40 SQL> SELECT dest_id,

22:41:41 2 THREAD#,

22:41:41 3 NAME,

22:41:41 4 sequence#,

22:41:41 5 archived,

22:41:41 6 applied,

22:41:41 7 a.NEXT_CHANGE#

22:41:41 8 FROM v$archived_log a

22:41:41 9 WHERE a.sequence# >= 40

22:41:41 10 AND resetlogs_change# = (SELECT d.RESETLOGS_CHANGE# FROM v$database d)

22:41:41 11 ORDER BY a.THREAD#,

22:41:41 12 a.sequence#,

22:41:41 13 a.dest_id;

DEST_ID THREAD# NAME SEQUENCE# ARC APPLIED NEXT_CHANGE#

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

1 1 /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_48bxmc9189.arc 48 YES NO 2234642

1 1 /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_49bxmjnyj3.arc 49 YES NO 2241189

1 1 /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_50bxml3lv7.arc 50 YES NO 2241194

1 1 /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_51bxml3lrh.arc 51 YES NO 2241198

1 1 /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_52bxml3lqv.arc 52 YES NO 2241209

1 1 /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_53bxml3lz7.arc 53 YES NO 2241214

1 1 /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_56bxml3lz0.arc 56 YES NO 2241419

1 1 /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_57bxml3m03.arc 57 YES NO 2243353

1 1 /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_58bxmp464x.arc 58 YES YES 2248351

1 1 /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_59bxmpksob.arc 59 YES IN-MEMORY 2248782

已选择10行。

已用时间: 00: 00: 00.00

22:41:41 SQL>

22:41:41 SQL> SELECT * FROM V$ARCHIVE_GAP;

未选定行

已用时间: 00: 00: 00.01

22:41:41 SQL>

备库read only 模式打开

22:41:41 SQL> alter database recover managed standby database cancel;

数据库已更改。

已用时间: 00: 00: 01.00

22:43:40 SQL> alter database open;

本人提供Oracle、MySQL、PG等数据库的培训和考证业务，私聊QQ646634621或微信db_bao，谢谢！

数据库已更改。

已用时间: 00: 00: 00.22

22:43:45 SQL> alter database recover managed standby database using current logfile disconnect from session;

数据库已更改。

已用时间: 00: 00: 06.04

22:44:00 SQL> 22:44:00 SQL>

22:44:02 SQL> select * from lhr.testdg;

D

-

X

X

X

已用时间: 00: 00: 00.00

22:44:10 SQL>

校验操作

主库：

22:41:00 SQL> alter system switch logfile;

系统已更改。

已用时间: 00: 00: 00.01

22:45:14 SQL> insert into lhr.testdg select * from lhr.testdg;

已创建 3 行。

已用时间: 00: 00: 00.00

22:45:29 SQL> commit;

提交完成。

已用时间: 00: 00: 00.01

22:45:32 SQL> select count(1) from lhr.testdg;

COUNT(1)

----------

6

已用时间: 00: 00: 00.00

22:45:42 SQL> archive log list;

数据库日志模式 存档模式

自动存档 启用

存档终点 USE_DB_RECOVERY_FILE_DEST

最早的联机日志序列 59

下一个存档日志序列 61

当前日志序列 61

22:46:03 SQL>

备库：

22:46:54 SQL> col name for a100

22:47:13 SQL> set linesize 9999 pagesize 9999

22:47:13 SQL> SELECT dest_id,

22:47:13 2 THREAD#,

22:47:13 3 NAME,

22:47:13 4 sequence#,

22:47:13 5 archived,

22:47:13 6 applied,

22:47:13 7 a.NEXT_CHANGE#

22:47:13 8 FROM v$archived_log a

22:47:13 9 WHERE a.sequence# >= 50

22:47:13 10 AND resetlogs_change# = (SELECT d.RESETLOGS_CHANGE# FROM v$database d)

22:47:13 11 ORDER BY a.THREAD#,

22:47:13 12 a.sequence#,

22:47:13 13 a.dest_id;

DEST_ID THREAD# NAME SEQUENCE# ARC APPLIED NEXT_CHANGE#

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

1 1 /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_50bxml3lv7.arc 50 YES NO 2241194

1 1 /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_51bxml3lrh.arc 51 YES NO 2241198

1 1 /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_52bxml3lqv.arc 52 YES NO 2241209

1 1 /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_53bxml3lz7.arc 53 YES NO 2241214

1 1 /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_56bxml3lz0.arc 56 YES NO 2241419

1 1 /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_57bxml3m03.arc 57 YES NO 2243353

1 1 /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_58bxmp464x.arc 58 YES YES 2248351

1 1 /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_59bxmpksob.arc 59 YES YES 2248782

1 1 /u01/app/oracle/flash_recovery_area/ORADGPHY/archivelog/2015_08_23/o1_mf_1_60bxmq3tn7.arc 60 YES IN-MEMORY 2249391

已选择9行。

已用时间: 00: 00: 00.00

22:47:13 SQL>

可以看到主备库正常。

删除备库

如果备份用不到了，则现在可以删除

RMAN> DELETE BACKUP TAG 'FOR STANDBY';

实验总结

最后，我们可以看到，在主库archivelog丢失无法同步到备库时，可以利用增量scn的方式，来避免重建standby，千万不要以为结束了，既然丢失了归档，数据库还是进行一次全备吧。

总结

进行Dataguard 的维护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，保证数据不丢失。

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