A LITTLE EFFORT EVERY DAY.YOU WILL MAKE A BIG DIFFERENCE.

如何使用DGBroker關閉redo應用

一、描述

Oracle 12c

rhel 7

二、實驗

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.查看數據庫信息

DGMGRL> show database verbose orcl;

Database - orcl

Role: PRIMARY

Intended State: TRANSPORT-ON --啟用傳輸

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 --應用啟用

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、知識點

1.使用DGBroker啟停redo apply

2.物理standby 數據庫狀態

3.MRP0進程作用

官網解釋如下：

Physical standby

APPLY-ON

Redo Apply is started on a physical standby database. --啟動redo應用

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. --關閉redo應用

If this is an Oracle RAC database, there is no instance running Apply Services until you change the database state to APPLY-ON.

如何使用DGBroker關閉redo應用（1）