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OGG在RAC上的初始化(下)-- OGG初始化

发表于：2025-02-05 作者：千家信息网编辑

千家信息网最后更新 2025年02月05日，上篇地址http://blog.itpub.net/29047826/viewspace-1284906/1，源端执行RMAN全库备份备份路径为节点node1的本地磁盘。为了将该备份复制到灾备端，此次

千家信息网最后更新 2025年02月05日OGG在RAC上的初始化(下)-- OGG初始化上篇地址http://blog.itpub.net/29047826/viewspace-1284906/

1，源端执行RMAN全库备份
备份路径为节点node1的本地磁盘。为了将该备份复制到灾备端，此次备份不能保存在ASM上。

run {
allocate channel ch01 device type disk;
allocate channel ch02 device type disk;
backup
format '/backup/full_%d_%s_%T_%p.bak'
database include current controlfile;
sql 'alter system archive log current';
backup
archivelog all format '/backup/arch_%d_%s_%T_%p';
release channel ch02;
release channel ch01;
}

2，查看controlfile所在的备份片。灾备端恢复的时候也从这个备份片中读取controlfile。

RMAN> list backup of controlfile;

List of Backup Sets
===================

BS Key Type LV Size Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ -------------------
37 Full 17.80M DISK 00:00:00 2014-09-28 23:53:06
BP Key: 37 Status: AVAILABLE Compressed: NO Tag: TAG20140928T235259
Piece Name: /backup/full_PROD_36_20140928_1.bak
Control File Included: Ckp SCN: 1260618 Ckp time: 2014-09-28 23:53:06

3，获取不活动的（INACTIVE）的已经归档的日志的最后一个SCN号，如果有多个已归档的INACTIVE的组，取最大的FIRST_CHANGE# 1260645
该SCN号作为灾备端recover database until 的SCN，并且在复制进程重新启动后也要参照这个SCN。

SYS@PROD1 > select inst_id,group#,thread#,sequence#,archived,status,first_change# from gv$log order by status;

INST_ID GROUP# THREAD# SEQUENCE# ARC STATUS FIRST_CHANGE#
---------- ---------- ---------- ---------- --- ---------------- -------------
1 3 2 25 NO CURRENT 1260660
2 3 2 25 NO CURRENT 1260660
1 1 1 29 NO CURRENT 1260655
2 1 1 29 NO CURRENT 1260655
1 2 1 28 YES INACTIVE 1260638
1 4 2 24 YES INACTIVE 1260645
2 2 1 28 YES INACTIVE 1260638
2 4 2 24 YES INACTIVE 1260645

4，将源端备份复制到灾备端

[oracle@node1 ~]$ scp /backup/* oracle@172.16.228.103:/backup/

5，停止灾备端的复制进程准备恢复数据库

GGSCI (node3) 4> stop rt1

Sending STOP request to REPLICAT RT1 ...
Request processed.

停止复制进程后，可以在源端继续执行一些DML操作。这些操作会正常的通过抽取进程获取，并有投递进程投递到灾备端的remote trail目录，只是暂时不用复制进程追加而已。

6，关闭灾备端数据库
[root@node3 ~]# srvctl stop database -d prod

7，灾备端从RMAN启动数据库到nomount状态

[root@node3 ~]# su - oracle
[oracle@node3 ~]$ rman target /

RMAN> startup nomount;

Oracle instance started

Total System Global Area 672256000 bytes

Fixed Size 2256272 bytes
Variable Size 520094320 bytes
Database Buffers 146800640 bytes
Redo Buffers 3104768 bytes

8，灾备端从RMAN恢复控制文件

RMAN> restore controlfile from '/backup/full_PROD_24_20140928_1.bak';

Starting restore at 2014-09-28 20:14:13
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=34 instance=PROD1 device type=DISK

channel ORA_DISK_1: restoring control file
channel ORA_DISK_1: restore complete, elapsed time: 00:00:01
output file name=+DATA/prod/controlfile/current.260.859387343
output file name=+ARCH/prod/controlfile/current.256.859387345
Finished restore at 2014-09-28 20:14:14

9，灾备端控制文件加载复制过来的备份集信息,核对控制文件信息

RMAN> catalog start with '/backup/';

RMAN> list backup;

10，灾备端从RMAN恢复数据库

RMAN> restore database;

11，灾备端从RMAN恢复归档日志

RMAN> run{
allocate channel c1 type disk;
allocate channel c2 type disk;
restore archivelog all;
release channel c1;
release channel c2;
}

12，灾备端从RMAN指定SCN恢复。该SCN是源端数据库执行RMAN备份后状态为INACTIVE中数值最大的SCN。

RMAN> recover database until scn 1260645

13，灾备端在mount状态下通过控制文件查看文件头的scn是否一致

SYS@PROD1 > select checkpoint_change# from v$datafile_header;

CHECKPOINT_CHANGE#
------------------
1260645
1260645
1260645
1260645
1260645
1260645
1260645

7 rows selected.

SYS@PROD1 > select checkpoint_change# from v$datafile;

CHECKPOINT_CHANGE#
------------------
1260645
1260645
1260645
1260645
1260645
1260645
1260645

14，灾备端resetlogs方式开启数据库

alter database open resetlogs;

[root@node3 ~]# srvctl start database -d prod

15，灾备端重新配置checkpoint

[oracle@node3 goldengate]$ ggsci

GGSCI (node3) 1> DBLOGIN USERID oggadmin,PASSWORD oggadmin

GGSCI (node3) 2> ADD CHECKPOINTTABLE oggadmin.checkpointtable

GGSCI (node3) 14> DELETE REPLICAT rt1

GGSCI (node3) 15> ADD REPLICAT rt1, EXTTRAIL /goldengate/dirdat/rt, checkpointtable oggadmin.checkpointtable

16，灾备端重新启动复制进程，从SCN为1260645开始
注意这个单词不要写错aftercsn

GGSCI (node3) 16> start rt1 aftercsn 1260645

Sending START request to MANAGER ...
REPLICAT RT1 starting

17，灾备端通过sqlplus查询恢复数据库期间生成的DML是否被成功追加
sqlplus / as sysdba
select * from snow.t1

本次初始化演练到此结束。

很赞哦！