ORACLE 11gR2 DG(Physical Standby)日常维护01

环境：RHEL 6.4 + Oracle 11.2.0.4

一、主备手工切换

• 1.1 主库，切换成备库并启动到mount
• 1.2 备库，切换成主库并启动到open
• 1.3 新的备库启动日志应用

二、重命名数据文件

• 2.1 主库，对应的数据文件或者表空间offline
• 2.2 主库，操作系统层面重命名数据文件
• 2.3 主库，重命名数据文件，表空间online
• 2.4 备库，停止redo应用
• 2.5 备库，关闭数据库
• 2.6 备库，操作系统层面重命名数据文件
• 2.7 备库，启动到mount状态
• 2.8 备库，重命名数据文件
• 2.9 备库，重新启动redo应用

Reference

一、主备手工切换

1.1 主库，切换成备库并启动到mount

1.1.1 查看主库状态
```
SQL> SELECT OPEN_MODE, DATABASE_ROLE, SWITCHOVER_STATUS, FORCE_LOGGING, DATAGUARD_BROKER, GUARD_STATUS FROM V$DATABASE;
```
1.1.2 切换到备库
```
SQL> ALTER DATABASE COMMIT TO SWITCHOVER TO PHYSICAL STANDBY;
```
1.1.3 启动到mount状态
```
SQL> STARTUP MOUNT
```

1.2 备库，切换成主库并启动到open

1.2.1 查看备库状态
```
SQL> SELECT OPEN_MODE, DATABASE_ROLE, SWITCHOVER_STATUS, FORCE_LOGGING, DATAGUARD_BROKER, GUARD_STATUS FROM V$DATABASE;
```
1.2.2 切换到主库
```
SQL> ALTER DATABASE COMMIT TO SWITCHOVER TO PRIMARY;
```
1.2.3 数据库open
```
SQL> ALTER DATABASE OPEN;
```

1.3 新的备库启动日志应用

1.3.1 备库mount状态直接启动日志应用
```
SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE DISCONNECT;
```
1.3.2 备库切换到open状态，启用Real-time query
A physical standby database instance cannot be opened if Redo Apply is active on a mounted instance of that database. Use the following SQL statements to stop Redo Apply, open a standby instance read-only, and restart Redo Apply:
```
SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CANCEL;
SQL> ALTER DATABASE OPEN;
SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE DISCONNECT;
```

二、重命名数据文件

2.1 主库，对应的数据文件或者表空间offline

```
SQL> ALTER TABLESPACE DBS_D_JINGYU OFFLINE;
```

2.2 主库，操作系统层面重命名数据文件

```
$ mv /u01/oradata01/JINGYU/datafile/o1_mf_dbs_d_ji_byqy17ph_.dbf /u01/oradata01/JINGYU/datafile/DBS_D_JINGYU01.dbf
```

2.3 主库，重命名数据文件，表空间online

```
SQL> ALTER TABLESPACE DBS_D_JINGYU RENAME DATAFILE '/u01/oradata01/JINGYU/datafile/o1_mf_dbs_d_ji_byqy17ph_.dbf' TO '/u01/oradata01/JINGYU/datafile/DBS_D_JINGYU01.dbf';
SQL> ALTER TABLESPACE DBS_D_JINGYU ONLINE;
```

2.4 备库，停止redo应用

```
SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CANCEL;
```

2.5 备库，关闭数据库

```
SQL> SHUTDOWN IMMEDIATE;
```

2.6 备库，操作系统层面重命名数据文件

```
$ mv /u01/oradata01/BOSTON/datafile/o1_mf_dbs_d_ji_22qjsbps_.dbf /u01/oradata01/BOSTON/datafile/DBS_D_JINGYU01.dbf
```

2.7 备库，启动到mount状态

```
SQL> STARTUP MOUNT
```

2.8 备库，重命名数据文件

2.8.1 需要先调整参数STANDBY_FILE_MANAGEMENT为MANUAL
否则重命名数据文件时会报错`ORA-01275: Operation RENAME is not allowed if standby file management is automatic.`
```
SQL> SHOW PARAMETER STANDBY_FILE_MANAGEMENT
SQL> ALTER SYSTEM SET STANDBY_FILE_MANAGEMENT = MANUAL;
```
2.8.2 重命名数据文件
```
SQL> ALTER DATABASE RENAME FILE '/u01/oradata01/BOSTON/datafile/o1_mf_dbs_d_ji_22qjsbps_.dbf' TO '/u01/oradata01/BOSTON/datafile/DBS_D_JINGYU01.dbf';
```
2.8.3 参数调整为AUTO
```
SQL> ALTER SYSTEM SET STANDBY_FILE_MANAGEMENT = AUTO;
```

2.9 备库，重新启动redo应用

```
SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE DISCONNECT FROM SESSION;
```

Reference

- Oracle® Data Guard Concepts and Administration 11g Release 2 (11.2)