合 DG日常维护

第一部分 日常维护

一 正确打开主库和备库

1 主库:

SQL> STARTUP MOUNT;

SQL> ALTER DATABASE ARCHIVELOG;

SQL> ALTER DATABASE OPEN;

2 备库:

SQL> STARTUP MOUNT;

SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE DISCONNECT FROM SESSION;

二 正确关闭顺序

1 备库:

SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CANCEL;

SQL>SHUTDOWN IMMEDIATE;

2 主库

SQL>SHUTDOWN IMMEDIATE; ---先于standby执行

三 备库Read-Only模式打开

当前主库正常OPEN状态

备库处于日志传送状态.

1 在备库停止日志传送

SQL> alter database recover managed standby database cancel;

2 备库Read-only模式打开

SQL> alter database open read only;

3 备库回到日志传送模式

SQL>alter database recover managed standby database disconnect from session;

Media recovery complete.

SQL> select status from v$instance;

STATUS

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

MOUNTED

四 日志传送状态监控

1 主库察看当前日志状况

SQL> select sequence#,status from v$log;

SEQUENCE# STATUS

51 ACTIVE

52 CURRENT

50 INACTIVE

2 备库察看RFS(Remote File Service)接收日志情况和MRP应用日志同步主库情况

SQL> SELECT PROCESS, STATUS, THREAD#, SEQUENCE#, BLOCK#, BLOCKS FROM V$MANAGED_STANDBY;

PROCESS STATUS THREAD# SEQUENCE# BLOCK# BLOCKS

ARCH CONNECTED 0 0 0 0

ARCH CONNECTED 0 0 0 0

RFS RECEIVING 0 0 0 0

MRP0 WAIT_FOR_LOG 1 52 0 0

RFS RECEIVING 0 0 0 0

可以看到备库MPR0正等待SEQUENCE#为52的redo.

3 察看备库是否和主库同步

SQL> SELECT ARCHIVED_THREAD#, ARCHIVED_SEQ#, APPLIED_THREAD#, APPLIED_SEQ# FROM V$ARCHIVE_DEST_STATUS;

ARCHIVED_THREAD# ARCHIVED_SEQ# APPLIED_THREAD# APPLIED_SEQ#

0 0 0 0

0 0 0 0

0 0 0 0

0 0 0 0

0 0 0 0

0 0 0 0

0 0 0 0

0 0 0 0

0 0 0 0

0 0 0 0

1 51 1 50

可以看到备库已经将SEQUENCE#51的日志归档,已经将SEQUENCE#50的redo应用到备库.

由于已经将SEQUENCE#51的日志归档,所以SEQUENCE#51以前的数据不会丢失.

4 察看备库已经归档的redo

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

REGISTR CREATOR THREAD# SEQUENCE# FIRST_CHANGE# NEXT_CHANGE#

SRMN SRMN 1 37 572907 573346

RFS ARCH 1 38 573346 573538

RFS ARCH 1 39 573538 573623

RFS ARCH 1 40 573623 573627

RFS ARCH 1 41 573627 574326

RFS ARCH 1 42 574326 574480

RFS ARCH 1 43 574480 590971

RFS ARCH 1 44 590971 593948

RFS FGRD 1 45 593948 595131

RFS FGRD 1 46 595131 595471

FGRD FGRD 1 46 595131 595471

REGISTR CREATOR THREAD# SEQUENCE# FIRST_CHANGE# NEXT_CHANGE#

RFS ARCH 1 47 595471 595731

RFS ARCH 1 48 595731 601476

RFS ARCH 1 49 601476 601532

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