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1. Active Data Guard 해제하기

A) 로그 적용 중지

DGMGRL 에서 standby 로그 적용 중지
EDIT DATABASE [standby 글로벌 DB명] SET STATE=apply-off;
DGMGRL> EDIT DATABASE orcl_stby SET STATE=apply-off;
Succeeded.

DGMGRL> SHOW DATABASE orcl_stby;

Database - orcl_stby

  Role:               PHYSICAL STANDBY
  Intended State:     APPLY-OFF
  Transport Lag:      0 seconds (computed 1 second ago)
  Apply Lag:          0 seconds (computed 1 second ago)
  Average Apply Rate: (unknown)
  Real Time Query:    OFF
  Instance(s):
    orcl

Database Status:
SUCCESS



B) Standby 데이터베이스 mount 모드로 재기동

Standby 중지 후 mount 모드로 기동
-- ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CANCEL;
SHUTDOWN IMMEDIATE;
STARTUP NOMOUNT;
ALTER DATABASE MOUNT STANDBY DATABASE;
ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE DISCONNECT;
-- ALTER DATABASE RECOVER MANAGED STANDBY DATABASE DISCONNECT;
SQL> SHUTDOWN IMMEDIATE;
Database closed.
Database dismounted.
ORACLE instance shut down.

SQL> STARTUP NOMOUNT;
ORACLE instance started.

Total System Global Area 1258290744 bytes
Fixed Size                  8896056 bytes
Variable Size             318767104 bytes
Database Buffers          922746880 bytes
Redo Buffers                7880704 bytes

SQL> ALTER DATABASE MOUNT STANDBY DATABASE;

Database altered.

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

Database altered.

SQL> SELECT db_unique_name, open_mode, database_role, switchover_status FROM v$database;

DB_UNIQUE_NAME       OPEN_MODE            DATABASE_ROLE        SWITCHOVER_STATUS
-------------------- -------------------- -------------------- --------------------
orcl_stby            MOUNTED              PHYSICAL STANDBY     NOT ALLOWED



C) 로그 적용 활성화

DGMGRL 에서 standby 로그 적용 활성화
EDIT DATABASE [standby 글로벌 DB명] SET STATE=apply-on;
DGMGRL> EDIT DATABASE orcl_stby SET STATE=apply-on;
Succeeded.

DGMGRL> SHOW DATABASE orcl_stby;

Database - orcl_stby

  Role:               PHYSICAL STANDBY
  Intended State:     APPLY-ON
  Transport Lag:      0 seconds (computed 0 seconds ago)
  Apply Lag:          0 seconds (computed 0 seconds ago)
  Average Apply Rate: 19.00 KByte/s
  Real Time Query:    OFF
  Instance(s):
    orcl

Database Status:
SUCCESS

DGMGRL> SHOW CONFIGURATION;

Configuration - dg_orcl

  Protection Mode: MaxPerformance
  Members:
  orcl      - Primary database
    orcl_stby - Physical standby database

Fast-Start Failover:  Disabled

Configuration Status:
SUCCESS   (status updated 11 seconds ago)



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