I. Failover
1. Failover 수행
A) DGMGRL로 Standby DB 접속
DGMGRL로 standby DB에 접속
dgmgrl sys/oracle@orcl_stb
[oracle@orcl ~]$ dgmgrl sys/oracle@orcl_stb DGMGRL for Linux: Release 12.2.0.1.0 - Production on Wed Aug 29 16:19:22 2018 Copyright (c) 1982, 2017, Oracle and/or its affiliates. All rights reserved. Welcome to DGMGRL, type "help" for information. Connected to "ORCL_STB" Connected as SYSDBA. DGMGRL>
B) Standby로 failover 수행
Standby로 failover 수행
FAILOVER TO orcl_stb;
DGMGRL> FAILOVER TO orcl_stb; Performing failover NOW, please wait... Failover succeeded, new primary is "orcl_stb"
C) Failover 결과 확인
Failover 후 상태 확인
SHOW CONFIGURATION; SHOW DATABASE orcl_stb; SHOW DATABASE orcl;
DGMGRL> SHOW CONFIGURATION;
Configuration - dg_orcl
Protection Mode: MaxPerformance
Members:
orcl_stb - Primary database
orcl - Physical standby database (disabled)
ORA-16661: the standby database needs to be reinstated
Fast-Start Failover: DISABLED
Configuration Status:
SUCCESS (status updated 6 seconds ago)
DGMGRL> SHOW DATABASE orcl_stb;
Database - orcl_stb
Role: PRIMARY
Intended State: TRANSPORT-ON
Instance(s):
orcl
Database Status:
SUCCESS
DGMGRL> SHOW DATABASE orcl;
Database - orcl
Role: PHYSICAL STANDBY
Intended State: APPLY-ON
Transport Lag: (unknown)
Apply Lag: (unknown)
Average Apply Rate: (unknown)
Real Time Query: OFF
Instance(s):
orcl
Database Status:
ORA-16661: the standby database needs to be reinstated
2. Primary 데이터베이스 reinstate하기
A) Reinstate 수행
Primary DB의 Reinstate 수행
REINSTATE DATABASE orcl;
DGMGRL> REINSTATE DATABASE orcl; Reinstating database "orcl", please wait... Operation requires shut down of instance "orcl" on database "orcl" Shutting down instance "orcl"... Connected to "ORCL" ORACLE instance shut down. Operation requires start up of instance "orcl" on database "orcl" Starting instance "orcl"... ORACLE instance started. Database mounted. Connected to "ORCL" Continuing to reinstate database "orcl" ... Reinstatement of database "orcl" succeeded
B) Reinstate 결과 확인
Reinstate 후 상태 확인
SHOW CONFIGURATION; SHOW DATABASE orcl;
DGMGRL> SHOW CONFIGURATION;
Configuration - dg_orcl
Protection Mode: MaxPerformance
Members:
orcl_stb - Primary database
orcl - Physical standby database
Fast-Start Failover: DISABLED
Configuration Status:
SUCCESS (status updated 6 seconds ago)
DGMGRL> SHOW DATABASE orcl;
Database - orcl
Role: PHYSICAL STANDBY
Intended State: APPLY-ON
Transport Lag: 0 seconds (computed 1 second ago)
Apply Lag: 0 seconds (computed 1 second ago)
Average Apply Rate: 295.00 KByte/s
Real Time Query: OFF
Instance(s):
orcl
Database Status:
SUCCESS
3. Primary로 복원
A) Primary로 switchover
Primary로 switchover 수행
SWITCHOVER TO orcl;
DGMGRL> SWITCHOVER TO orcl; Performing switchover NOW, please wait... Operation requires a connection to database "orcl" Connecting ... Connected to "ORCL" Connected as SYSDBA. New primary database "orcl" is opening... Operation requires start up of instance "orcl" on database "orcl_stb" Starting instance "orcl"... ORACLE instance started. Database mounted. Connected to "ORCL_STB" Switchover succeeded, new primary is "orcl"
B) Switchover 결과 확인
Switchover 결과 확인
SHOW CONFIGURATION; SHOW DATABASE orcl; SHOW DATABASE orcl_stb;
DGMGRL> SHOW CONFIGURATION;
Configuration - dg_orcl
Protection Mode: MaxPerformance
Members:
orcl - Primary database
orcl_stb - Physical standby database
Fast-Start Failover: DISABLED
Configuration Status:
SUCCESS (status updated 49 seconds ago)
DGMGRL> SHOW DATABASE orcl;
Database - orcl
Role: PRIMARY
Intended State: TRANSPORT-ON
Instance(s):
orcl
Database Status:
SUCCESS
DGMGRL> SHOW DATABASE orcl_stb;
Database - orcl_stb
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: 15.00 KByte/s
Real Time Query: OFF
Instance(s):
orcl
Database Status:
SUCCESS
