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如何使用DGBroker关闭redo应用
一、描述
Oracle 12c
rhel 7
二、实验
1.查看配置
DGMGRL> show configuration;
Configuration - dg_config
Protection Mode: MaxAvailability
Members:
orcl - Primary database
orcldg - Physical standby database
Fast-Start Failover: DISABLED
Configuration Status:
SUCCESS (status updated 27 seconds ago)
DGMGRL>
2.查看数据库信息
DGMGRL> show database verbose orcl;
Database - orcl
Role: PRIMARY
Intended State: TRANSPORT-ON --启用传输
Instance(s):
orcl
Properties:
DGConnectIdentifier = 'orcl'
ObserverConnectIdentifier = ''
LogXptMode = 'sync'
RedoRoutes = ''
DelayMins = '0'
Binding = 'optional'
MaxFailure = '0'
MaxConnections = '1'
ReopenSecs = '300'
NetTimeout = '10'
RedoCompression = 'DISABLE'
LogShipping = 'ON'
PreferredApplyInstance = ''
ApplyInstanceTimeout = '0'
ApplyLagThreshold = '0'
TransportLagThreshold = '0'
TransportDisconnectedThreshold = '30'
ApplyParallel = 'AUTO'
StandbyFileManagement = 'AUTO'
ArchiveLagTarget = '0'
LogArchiveMaxProcesses = '4'
LogArchiveMinSucceedDest = '1'
DbFileNameConvert = ''
LogFileNameConvert = ''
FastStartFailoverTarget = ''
InconsistentProperties = '(monitor)'
InconsistentLogXptProps = '(monitor)'
SendQEntries = '(monitor)'
LogXptStatus = '(monitor)'
RecvQEntries = '(monitor)'
StaticConnectIdentifier = '(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=roidb01)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=orcl_DGMGRL)(INSTANCE_NAME=orcl)(SERVER=DEDICATED)))'
StandbyArchiveLocation = '+DATADG/arch'
AlternateLocation = ''
LogArchiveTrace = '0'
LogArchiveFormat = 'log_%t_%s_%r_%d.arc'
TopWaitEvents = '(monitor)'
Database Status:
SUCCESS
DGMGRL> show database verbose orcldg;
Database - orcldg
Role: PHYSICAL STANDBY
Intended State: APPLY-ON --应用启用
Transport Lag: 0 seconds (computed 1 second ago)
Apply Lag: 0 seconds (computed 1 second ago)
Average Apply Rate: 0 Byte/s
Active Apply Rate: 0 Byte/s
Maximum Apply Rate: 0 Byte/s
Real Time Query: ON
Instance(s):
orcldg
Properties:
DGConnectIdentifier = 'orcldg'
ObserverConnectIdentifier = ''
LogXptMode = 'sync'
RedoRoutes = ''
DelayMins = '0'
Binding = 'optional'
MaxFailure = '0'
MaxConnections = '1'
ReopenSecs = '300'
NetTimeout = '10'
RedoCompression = 'DISABLE'
LogShipping = 'ON'
PreferredApplyInstance = ''
ApplyInstanceTimeout = '0'
ApplyLagThreshold = '0'
TransportLagThreshold = '0'
TransportDisconnectedThreshold = '30'
ApplyParallel = 'AUTO'
StandbyFileManagement = 'AUTO'
ArchiveLagTarget = '0'
LogArchiveMaxProcesses = '4'
LogArchiveMinSucceedDest = '1'
DbFileNameConvert = ''
LogFileNameConvert = ''
FastStartFailoverTarget = ''
InconsistentProperties = '(monitor)'
InconsistentLogXptProps = '(monitor)'
SendQEntries = '(monitor)'
LogXptStatus = '(monitor)'
RecvQEntries = '(monitor)'
StaticConnectIdentifier = '(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=roidb02)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=orcldg_DGMGRL)(INSTANCE_NAME=orcldg)(SERVER=DEDICATED)))'
StandbyArchiveLocation = '+DATADG/arch'
AlternateLocation = ''
LogArchiveTrace = '0'
LogArchiveFormat = 'log_%t_%s_%r_%d.arc'
TopWaitEvents = '(monitor)'
Database Status:
SUCCESS
DGMGRL> edit database 'orcldg' set state='apply-off';
Succeeded.
DGMGRL>
SQL> select process,status from v$managed_standby;
PROCESS STATUS
--------- ------------
ARCH CLOSING
ARCH CLOSING
ARCH CONNECTED
ARCH CLOSING
RFS IDLE
RFS IDLE
RFS IDLE
RFS IDLE
8 rows selected.
DGMGRL> edit database 'orcldg' set state='apply-on';
Succeeded.
DGMGRL>
SQL> /
PROCESS STATUS
--------- ------------
ARCH CLOSING
ARCH CLOSING
ARCH CONNECTED
ARCH CLOSING
RFS IDLE
RFS IDLE
RFS IDLE
RFS IDLE
MRP0 APPLYING_LOG
9 rows selected.
三、知识点
1.使用DGBroker启停redo apply
2.物理standby 数据库状态
3.MRP0进程作用
官网解释如下：
Physical standby
APPLY-ON
Redo Apply is started on a physical standby database. --启动redo应用
If the standby database is an Oracle RAC database, the broker starts Redo Apply on exactly one standby instance,
called the apply instance. If this instance fails, the broker automatically chooses another instance that is either
mounted or open read-only. This new instance then becomes the apply instance.
This is the default state for a physical standby database when it is enabled for the first time.
If a license for the Oracle Active Data Guard option has been purchased, a physical standby database
can be open while Redo Apply is active. This capability is known as real-time query.
See Oracle Data Guard Concepts and Administration for more details.
Physical standby
APPLY-OFF
Redo Apply is stopped. --关闭redo应用
If this is an Oracle RAC database, there is no instance running Apply Services until you change the database state to APPLY-ON.
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