1.standby database 正常的打开与关闭

1.1 针对 physical standby

打开：

--打开数据库

SQL>startup;

-- 开启 mgr 进程

SQL>ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE disconnect from session; ( physical standby )

关闭：

-- 关闭 mgr 进程

SQL>ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CANCEL;

-- 正常关闭数据库

SQL> shutdown immediate;

1.2 针对 logical standby

-- 开启 mgr 进程

SQL>ALTER DATABASE START LOGICAL STANDBY APPLY IMMEDIATE;

-- 关闭 mgr 进程

SQL>ALTER DATABASE STOP LOGICAL STANDBY APPLY;

2. 查看数据库角色与保护模式

SQL> select protection_mode, protection_level, database_role role, switchover_status from v$database;

3.查询每个standby 的状态：

-- 主库执行

SQL> SELECT DEST_ID, STATUS,APPLIED_SCN FROM V$ARCHIVE_DEST WHERE TARGET='STANDBY';

DEST_ID STATUS APPLIED_SCN

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

2 VALID 1818069

4. 检查redo 传送情况

-- 备库查看当前 log sequence

SQL> archive log list;

Database log mode Archive Mode

Automatic archival Enabled

Archive destination USE_DB_RECOVERY_FILE_DEST

Oldest online log sequence 41

Next log sequence to archive 0

Current log sequence 41

-- 主库日志切换

SQL> alter system switch logfile;

System altered.

-- 备库查看当前 log sequence ，如果 log sequence 有变化说明传输没有问题。

SQL> archive log list;

Database log mode Archive Mode

Automatic archival Enabled

Archive destination USE_DB_RECOVERY_FILE_DEST

Oldest online log sequence 41

Next log sequence to archive 0

Current log sequence 42

5. 检查 mrp 应用情况

--备库执行

SQL> SELECT THREAD#, SEQUENCE#, FIRST_CHANGE#,NEXT_CHANGE#,APPLIED FROM V$ARCHIVED_LOG;

THREAD# SEQUENCE# FIRST_CHANGE# NEXT_CHANGE# APPLIED

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

1 24 1449716 1451135 YES

1 26 1476706 1481494 YES

1 25 1451135 1476706 YES

1 27 1481494 1491422 YES

1 29 1524315 1547524 YES

6. 查询archived log 的历史信息：（主备都执行，对比是否相同）

SQL> SELECT THREAD#, SEQUENCE#, FIRST_CHANGE#, NEXT_CHANGE# FROM V$LOG_HISTORY;

7. 查询DG的日志信息，这些日志信息可以写入alert log 或者进程的trace 文件

SQL> set pagesize 200

SQL> SELECT MESSAGE FROM V$DATAGUARD_STATUS;

MESSAGE

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

ARC0: Archival started

ARC1: Archival started

ARC2: Archival started

ARC2: Becoming the 'no FAL' ARCH

ARC1: Becoming the heartbeat ARCH

ARC1: Becoming the active heartbeat ARCH

ARC3: Archival started