Oracle dgbroker常规命令管理简介
在前面的文章中已经部署好了Oracle 19c ADG环境，并配置了db broker管理。
在这里简单介绍下dg broker的基本管理和使用。
1、登录db broker
[oracle@mgrser1 admin]$ dgmgrl
DGMGRL for Linux: Release 19.0.0.0.0 - Production on Tue Nov 4 02:56:28 2025
Version 19.3.0.0.0
Copyright (c) 1982, 2019, Oracle and/or its affiliates. All rights reserved.
Welcome to DGMGRL, type "help" for information.
DGMGRL> connect sys@woo_dgmgrl
Password:
Connected to "woo"
Connected as SYSDBA.
DGMGRL> 2、查看主备数据库信息
DGMGRL> show configuration;
Configuration - woo_broker_cfg
Protection Mode: MaxPerformance
Members:
woo - Primary database
woostd - Physical standby database
Fast-Start Failover: Disabled
Configuration Status:
SUCCESS (status updated 7 seconds ago)
DGMGRL>
DGMGRL> show database woo;
Database - woo
Role: PRIMARY
Intended State: TRANSPORT-ON
Instance(s):
woo
Database Status:
SUCCESS
DGMGRL>
DGMGRL> show database woostd;
Database - woostd
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: 24.00 KByte/s
Real Time Query: ON
Instance(s):
woo
Database Status:
SUCCESS
DGMGRL> 3、查看ADG同步延迟
DGMGRL>
DGMGRL> show database woostd;
Database - woostd
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: 24.00 KByte/s
Real Time Query: ON
Instance(s):
woo
Database Status:
SUCCESS <<<4、查看详细信息包括日志文件
DGMGRL> show database verbose woo;
Database - woo
Role: PRIMARY
Intended State: TRANSPORT-ON
Instance(s):
woo
Properties:
DGConnectIdentifier = 'woo_dgmgrl'
ObserverConnectIdentifier = ''
FastStartFailoverTarget = ''
PreferredObserverHosts = ''
LogShipping = 'ON'
RedoRoutes = ''
LogXptMode = 'ASYNC'
DelayMins = '0'
Binding = 'optional'
MaxFailure = '0'
ReopenSecs = '300'
NetTimeout = '30'
RedoCompression = 'DISABLE'
PreferredApplyInstance = ''
ApplyInstanceTimeout = '0'
ApplyLagThreshold = '30'
TransportLagThreshold = '30'
TransportDisconnectedThreshold = '30'
ApplyParallel = 'AUTO'
ApplyInstances = '0'
StandbyFileManagement = ''
ArchiveLagTarget = '0'
LogArchiveMaxProcesses = '0'
LogArchiveMinSucceedDest = '0'
DataGuardSyncLatency = '0'
LogArchiveTrace = '0'
LogArchiveFormat = ''
DbFileNameConvert = ''
LogFileNameConvert = ''
ArchiveLocation = ''
AlternateLocation = ''
StandbyArchiveLocation = ''
StandbyAlternateLocation = ''
InconsistentProperties = '(monitor)'
InconsistentLogXptProps = '(monitor)'
LogXptStatus = '(monitor)'
SendQEntries = '(monitor)'
RecvQEntries = '(monitor)'
HostName = 'mgrser1'
StaticConnectIdentifier = '(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=192.168.56.104)(PORT=1521)))(CONNECT_DATA=(SERVICE_NAME=woo_DGMGRL)(INSTANCE_NAME=woo)(SERVER=DEDICATED)))'
TopWaitEvents = '(monitor)'
SidName = '(monitor)'
Log file locations:
Alert log : /oradb/oracle/diag/rdbms/woo/woo/trace/alert_woo.log
Data Guard Broker log : /oradb/oracle/diag/rdbms/woo/woo/trace/drcwoo.log
Database Status:
SUCCESS
DGMGRL>
DGMGRL> show database verbose woostd;
Database - woostd
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: 21.00 KByte/s
Active Apply Rate: 0 Byte/s
Maximum Apply Rate: 0 Byte/s
Real Time Query: ON
Instance(s):
woo
Properties:
DGConnectIdentifier = 'woostd_dgmgrl'
ObserverConnectIdentifier = ''
FastStartFailoverTarget = ''
PreferredObserverHosts = ''
LogShipping = 'ON'
RedoRoutes = ''
LogXptMode = 'ASYNC'
DelayMins = '0'
Binding = 'optional'
MaxFailure = '0'
ReopenSecs = '300'
NetTimeout = '30'
RedoCompression = 'DISABLE'
PreferredApplyInstance = ''
ApplyInstanceTimeout = '0'
ApplyLagThreshold = '30'
TransportLagThreshold = '30'
TransportDisconnectedThreshold = '30'
ApplyParallel = 'AUTO'
ApplyInstances = '0'
StandbyFileManagement = ''
ArchiveLagTarget = '0'
LogArchiveMaxProcesses = '0'
LogArchiveMinSucceedDest = '0'
DataGuardSyncLatency = '0'
LogArchiveTrace = '0'
LogArchiveFormat = ''
DbFileNameConvert = ''
LogFileNameConvert = ''
ArchiveLocation = ''
AlternateLocation = ''
StandbyArchiveLocation = ''
StandbyAlternateLocation = ''
InconsistentProperties = '(monitor)'
InconsistentLogXptProps = '(monitor)'
LogXptStatus = '(monitor)'
SendQEntries = '(monitor)'
RecvQEntries = '(monitor)'
HostName = 'mgrser2'
StaticConnectIdentifier = '(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=192.168.56.105)(PORT=1521)))(CONNECT_DATA=(SERVICE_NAME=WOOSTD_DGMGRL)(INSTANCE_NAME=woo)(SERVER=DEDICATED)))'
TopWaitEvents = '(monitor)'
SidName = '(monitor)'
Log file locations:
Alert log : /oradb/oracle/diag/rdbms/woostd/woo/trace/alert_woo.log
Data Guard Broker log : /oradb/oracle/diag/rdbms/woostd/woo/trace/drcwoo.log
Database Status:
SUCCESS
DGMGRL> 5、使用DG Broker管理日志传输
关闭到备库的日志传输
DGMGRL> edit database 'woo' set state='TRANSPORT-OFF';
Succeeded.
DGMGRL> show database woo;
Database - woo
Role: PRIMARY
Intended State: TRANSPORT-OFF <<<<<<
Instance(s):
woo
Database Status:
SUCCESS
DGMGRL> 查看主库的LNS进程
SQL> select process,status,thread#,sequence# from v$managed_standby where process like 'LNS%';
PROCESS STATUS THREAD# SEQUENCE#
--------- ------------ ---------- ----------
LNS WRITING 1 34
SQL> --再次查看
SQL> /
PROCESS STATUS THREAD# SEQUENCE#
--------- ------------ ---------- ----------
LNS WRITING 1 34
SQL> /
PROCESS STATUS THREAD# SEQUENCE#
--------- ------------ ---------- ----------
LNS WRITING 1 34
SQL> alter system switch logfile;
System altered.
SQL> select process,status,thread#,sequence# from v$managed_standby where process like 'LNS%';
no rows selected
SQL> 查看主库上的log_archive_dest_state_n参数
SQL> show parameter log_archive_dest_state_2
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest_state_2 string RESET <<<<<<<<<<<<
log_archive_dest_state_20 string enable
log_archive_dest_state_21 string enable
log_archive_dest_state_22 string enable
log_archive_dest_state_23 string enable
log_archive_dest_state_24 string enable
log_archive_dest_state_25 string enable
log_archive_dest_state_26 string enable
log_archive_dest_state_27 string enable
log_archive_dest_state_28 string enable
log_archive_dest_state_29 string enable
SQL> 查看备库日志状态正等待35号
SQL> select process,status,sequence# from v$managed_standby;
PROCESS STATUS SEQUENCE#
--------- ------------ ----------
ARCH CONNECTED 0
DGRD ALLOCATED 0
DGRD ALLOCATED 0
ARCH CONNECTED 0
ARCH CLOSING 33
ARCH CLOSING 34
RFS IDLE 0
MRP0 WAIT_FOR_LOG 35
8 rows selected.回复到备库的日志同步
DGMGRL>
DGMGRL> edit database 'woo' set state='TRANSPORT-ON';
Succeeded.
DGMGRL> show database woo;
Database - woo
Role: PRIMARY
Intended State: TRANSPORT-ON
Instance(s):
woo
Database Status:
SUCCESS
DGMGRL>
SQL> select process,status,sequence# from v$managed_standby;
PROCESS STATUS SEQUENCE#
--------- ------------ ----------
ARCH CONNECTED 0
DGRD ALLOCATED 0
DGRD ALLOCATED 0
ARCH CLOSING 35
ARCH CLOSING 33
ARCH CLOSING 34
RFS IDLE 36
RFS IDLE 0
RFS IDLE 0
MRP0 APPLYING_LOG 36 <<<<< c重新开始应用日志了
10 rows selected.
SQL>
--主库LNS进程也恢复了
SQL> select process,status,thread#,sequence# from v$managed_standby where process like 'LNS%';
PROCESS STATUS THREAD# SEQUENCE#
--------- ------------ ---------- ----------
LNS WRITING 1 36
SQL>
SQL> show parameter log_archive_dest_state_2
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest_state_2 string ENABLE <<<<<<
log_archive_dest_state_20 string enable
log_archive_dest_state_21 string enable
log_archive_dest_state_22 string enable
log_archive_dest_state_23 string enable
log_archive_dest_state_24 string enable
log_archive_dest_state_25 string enable
log_archive_dest_state_26 string enable
log_archive_dest_state_27 string enable
log_archive_dest_state_28 string enable
log_archive_dest_state_29 string enable
SQL>
SQL> DG Broker控制redo传输是通过修改主库的log_archive_dest_state_n参数来实现的。
关闭到指定备库的redo传输
将备库的LogShipping属性设置为OFF来暂停对该备库的日志传输：
show database woostd logshipping;
edit database 'woostd' set property LogShipping='OFF';
edit database 'woostd' set property LogShipping='ON';6、物理备库和逻辑备库之间的转换
使用DG Broker管理备库
通过DG Broker可以方便地将备库在只读的物理备库模式和可读写的快照备库模式之间转换。在快照备库模式下对备库的写操作是暂时性的，当备库切回物理备库模式时，这些写操作会全部回滚。物理备库转换为快照备库的前提是备库开启了快速闪回区（Fast Recovery Area）。
DGMGRL> CONVERT DATABASE 'woostd' TO SNAPSHOT STANDBY;
Converting database "woostd" to a Snapshot Standby database, please wait...
Database "woostd" converted successfully
DGMGRL>
SQL> set line 200
SQL> select db_unique_name,open_mode,database_role,switchover_status from v$database;
DB_UNIQUE_NAME OPEN_MODE DATABASE_ROLE SWITCHOVER_STATUS
------------------------------ -------------------- ---------------- --------------------
WOOSTD READ ONLY WITH APPLY PHYSICAL STANDBY NOT ALLOWED
SQL>
SQL>
SQL>
SQL> --check again
SQL> select db_unique_name,open_mode,database_role,switchover_status from v$database;
select db_unique_name,open_mode,database_role,switchover_status from v$database
*
ERROR at line 1:
ORA-03135: connection lost contact
Process ID: 1635
Session ID: 1 Serial number: 27414
SQL> exit
Disconnected from Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
Version 19.3.0.0.0
[oracle@mgrser2 ~]$ sqlplus / as sysdba
SQL*Plus: Release 19.0.0.0.0 - Production on Tue Nov 4 03:21:07 2025
Version 19.3.0.0.0
Copyright (c) 1982, 2019, Oracle. All rights reserved.
Connected to:
Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
Version 19.3.0.0.0
SQL> select db_unique_name,open_mode,database_role,switchover_status from v$database;
DB_UNIQUE_NAME OPEN_MODE DATABASE_ROLE
------------------------------ -------------------- ----------------
SWITCHOVER_STATUS
--------------------
WOOSTD READ WRITE SNAPSHOT STANDBY
NOT ALLOWED
SQL> set line 200
SQL> select db_unique_name,open_mode,database_role,switchover_status from v$database;
DB_UNIQUE_NAME OPEN_MODE DATABASE_ROLE SWITCHOVER_STATUS
------------------------------ -------------------- ---------------- --------------------
WOOSTD READ WRITE SNAPSHOT STANDBY NOT ALLOWED
SQL>
SQL>
SQL> set line 200
SQL> select db_unique_name,open_mode,database_role,switchover_status from v$database;
DB_UNIQUE_NAME OPEN_MODE DATABASE_ROLE SWITCHOVER_STATUS
------------------------------ -------------------- ---------------- --------------------
WOOSTD READ WRITE SNAPSHOT STANDBY NOT ALLOWED
SQL>
SQL> create table elden_npc(npc_id number(6), name varchar2(30), career varchar2(20));
Table created. <<<<< 备库可读写
SQL> drop table elden_npc purge;
Table dropped.
SQL> create table dgmgrtab(did number(6), name varchar2(30), career varchar2(20));
Table created.
SQL>
SQL> insert into dgmgrtab values (1, 'dgmgr', 'abc');
1 row created.
SQL>
SQL> commit;
Commit complete.转换备库为只读物理备库
尝试切换快照备库为物理备库：
DGMGRL> show database woostd;
Database - woostd
Role: SNAPSHOT STANDBY
Transport Lag: 0 seconds (computed 1 second ago)
Apply Lag: 5 minutes 30 seconds (computed 1 second ago) <<<< 在操作过程中主库的数据并未同步到备库
Instance(s):
woo
Database Status:
SUCCESS
DGMGRL> CONVERT DATABASE 'woostd' TO PHYSICAL STANDBY; <<<<< 重新切换到物理备库
Converting database "woostd" to a Physical Standby database, please wait...
Operation requires shut down of instance "woo" on database "woostd"
Shutting down instance "woo"...
Connected to "WOOSTD"
Database closed.
Database dismounted.
ORACLE instance shut down.
Operation requires start up of instance "woo" on database "woostd"
Starting instance "woo"...
Connected to an idle instance.
ORACLE instance started.
Connected to "WOOSTD"
Database mounted.
Connected to "WOOSTD"
Continuing to convert database "woostd" ...
Database "woostd" converted successfully
DGMGRL>
SQL> select db_unique_name,open_mode,database_role,switchover_status from v$database;
select db_unique_name,open_mode,database_role,switchover_status from v$database
* <<<<<<<<<< 重新切换物理备库后要重新登录一次数据库
ERROR at line 1:
ORA-03135: connection lost contact
Process ID: 3963
Session ID: 63 Serial number: 55232
SQL> exit
Disconnected from Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
Version 19.3.0.0.0
[oracle@mgrser2 ~]$ sqlplus / as sysdba
SQL*Plus: Release 19.0.0.0.0 - Production on Tue Nov 4 03:26:35 2025
Version 19.3.0.0.0
Copyright (c) 1982, 2019, Oracle. All rights reserved.
Connected to:
Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
Version 19.3.0.0.0
SQL> select db_unique_name,open_mode,database_role,switchover_status from v$database;
DB_UNIQUE_NAME OPEN_MODE DATABASE_ROLE
------------------------------ -------------------- ----------------
SWITCHOVER_STATUS
--------------------
WOOSTD READ ONLY WITH APPLY PHYSICAL STANDBY
NOT ALLOWED
SQL> set line 200
SQL> select db_unique_name,open_mode,database_role,switchover_status from v$database;
DB_UNIQUE_NAME OPEN_MODE DATABASE_ROLE SWITCHOVER_STATUS
------------------------------ -------------------- ---------------- --------------------
WOOSTD READ ONLY WITH APPLY PHYSICAL STANDBY NOT ALLOWED
SQL> select * from dgmgrtab; <<<<<<< 可以看到，快照备库期间写入的数据已经回滚了。
select * from dgmgrtab
*
ERROR at line 1:
ORA-00942: table or view does not exist
SQL>
SQL>
SQL> 7、使用DG Broker进行主备切换
检查是否可以进行切换：
DGMGRL> validate database woostd;
Database Role: Physical standby database
Primary Database: woo
Ready for Switchover: Yes
Ready for Failover: Yes (Primary Running)
Flashback Database Status:
woo : Off
woostd: Off
Managed by Clusterware:
woo : NO
woostd: NO
Validating static connect identifier for the primary database woo...
The static connect identifier allows for a connection to database "woo".
DGMGRL> validate database woo;
Database Role: Primary database
Ready for Switchover: Yes <<<<<<<<<<<
Flashback Database Status:
woo: Off
Managed by Clusterware:
woo: NO
Validating static connect identifier for the primary database woo...
The static connect identifier allows for a connection to database "woo".
DGMGRL> 切换前查看主备角色
--主库
SQL> col host_name for a30
SQL> select a.host_name,b.database_role from v$instance a,v$database b;
HOST_NAME DATABASE_ROLE
------------------------------ ----------------
mgrser1 PRIMARY
--备库
SQL> col host_name for a30
SQL> select a.host_name,b.database_role from v$instance a,v$database b;
HOST_NAME DATABASE_ROLE
------------------------------ ----------------
mgrser2 PHYSICAL STANDBY开始切换
switchover to woostd(计划需要成为主库角色的唯一名);
DGMGRL> switchover to woostd;
Performing switchover NOW, please wait...
Operation requires a connection to database "woostd"
Connecting ...
Connected to "WOOSTD"
Connected as SYSDBA.
New primary database "woostd" is opening...
Operation requires start up of instance "woo" on database "woo"
Starting instance "woo"...
Connected to an idle instance.
ORACLE instance started.
Connected to "woo"
Database mounted.
Database opened.
Connected to "woo"
Switchover succeeded, new primary is "woostd"
DGMGRL>
DGMGRL>
DGMGRL> 再次查询主备库状态
--原主库角色
SQL> --check again
SQL>
SQL> select a.host_name,b.database_role from v$instance a,v$database b;
select a.host_name,b.database_role from v$instance a,v$database b
*
ERROR at line 1:
ORA-03135: connection lost contact
Process ID: 3476
Session ID: 103 Serial number: 16969
SQL> exit
Disconnected from Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
Version 19.3.0.0.0
[oracle@mgrser1 ~]$ sqlplus / as sysdba
SQL*Plus: Release 19.0.0.0.0 - Production on Tue Nov 4 03:38:24 2025
Version 19.3.0.0.0
Copyright (c) 1982, 2019, Oracle. All rights reserved.
Connected to:
Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
Version 19.3.0.0.0
SQL> select a.host_name,b.database_role from v$instance a,v$database b;
HOST_NAME
----------------------------------------------------------------
DATABASE_ROLE
----------------
mgrser1
PHYSICAL STANDBY
SQL>
--原备库角色
SQL> select a.host_name,b.database_role from v$instance a,v$database b;
select a.host_name,b.database_role from v$instance a,v$database b
*
ERROR at line 1:
ORA-03135: connection lost contact
Process ID: 4379
Session ID: 67 Serial number: 27229
SQL> exit
Disconnected from Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
Version 19.3.0.0.0
[oracle@mgrser2 ~]$ sqlplus / as sysdba
SQL*Plus: Release 19.0.0.0.0 - Production on Tue Nov 4 03:38:35 2025
Version 19.3.0.0.0
Copyright (c) 1982, 2019, Oracle. All rights reserved.
Connected to:
Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
Version 19.3.0.0.0
SQL> select a.host_name,b.database_role from v$instance a,v$database b;
HOST_NAME
----------------------------------------------------------------
DATABASE_ROLE
----------------
mgrser2
PRIMARY
DGMGRL> show configuration;
Configuration - woo_broker_cfg
Protection Mode: MaxPerformance
Members:
woostd - Primary database <<<<< 角色已经调换
woo - Physical standby database
Fast-Start Failover: Disabled
Configuration Status:
SUCCESS (status updated 60 seconds ago)
DGMGRL> 回切正常
DGMGRL>
DGMGRL> switchover to woo;
Performing switchover NOW, please wait...
Operation requires a connection to database "woo"
Connecting ...
Connected to "woo"
Connected as SYSDBA.
New primary database "woo" is opening...
Operation requires start up of instance "woo" on database "woostd"
Starting instance "woo"...
Connected to an idle instance.
ORACLE instance started.
Connected to "WOOSTD"
Database mounted.
Database opened.
Connected to "WOOSTD"
Switchover succeeded, new primary is "woo"
DGMGRL>
DGMGRL>
DGMGRL> show configuration;
Configuration - woo_broker_cfg
Protection Mode: MaxPerformance
Members:
woo - Primary database
woostd - Physical standby database
Fast-Start Failover: Disabled
Configuration Status:
SUCCESS (status updated 62 seconds ago)
DGMGRL>