Oracle Data Guard Broker Webinar

Brillix ויועץ אורקל בכיר בחברת CTO , • זהר אלקיים
אורקל מאז 1998 )תשתיתי ואפליקטיבי( DBA •
ilDBA • עורך משותף של אתר
zoharelkayam.wordpress.com : • בלוגר
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 The Oracle Data Guard broker is a distributed
management framework.
 The broker automates and centralizes the
creation, maintenance, and monitoring of
Data Guard configurations.
 With the broker, you can perform all
management operations locally or remotely
with easy-to-use interfaces:
◦ Oracle Enterprise Manager Grid Control
◦ DGMGRL (a command-line interface)
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With the Broker Without the Broker
General Manage databases as one Manage databases separately
Creation of the standby
database
Use Grid Control wizards Manually create files
Configuration and
management
Configure and manage
from single interface
Set up services manually for each database
Monitoring • Monitor continuously
• Unified status and reports
• Integrate with EM events
Monitor each database individually through
views and scripts
Control Invoke role transitions with
a single command
Coordinate sequences of multiple commands
across database sites for role transitions

 Client-side:
◦ Oracle Enterprise Manager Grid Control
◦ DGMGRL (command-line interface)
 Server-side: Data Guard monitor
◦ DMON process
◦ Configuration files
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Agent Agent
CLI management client
Oracle
Management
Server
Enterprise Manager
Repository
Primary
database
Data
Guard
broker
Data
Guard
broker
Standby
database

 The most common configuration is a primary
database at one location and a standby
database at another location.
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pc00prmy
Primary site
pc00sby1
Standby site
Oracle Net

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Data Guard Broker Configuration
Broker-controlled
databases
Primary database
Standby database
Standby database
Standby database
Standby database
Standby database
Standby database
Standby database
Standby database
Standby database
Instances
Instances

 Server-side background process
 Part of each database instance in the
configuration
 Created when you start the broker
 Performs requested functions and monitors the
resource
 Communicates with other DMON processes in the
configuration
 Updates the configuration file
 Creates the drc<SID> trace file in the location set
by the DIAGNOSTIC_DEST initialization parameter
 Modifies initialization parameters during role
transitions as necessary
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 Command-line interface (CLI):
◦ Is started by entering DGMGRL at the command
prompt where the Oracle server or an Oracle client
is installed
◦ Enables you to control and monitor a Data Guard
configuration from the prompt or in scripts
 Oracle Enterprise Manager Grid Control:
◦ Provides wizards to simplify creating and managing
standby databases
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DGMGRL> connect sys/oracle
Connected.
DGMGRL> show configuration verbose
Configuration
Name: DGConfig1
Enabled: YES
Protection Mode: MaxAvailability
Databases:
pc00prmy - Primary database
pc00sby1 - Physical standby database
Fast-Start Failover: DISABLED
Current status for "DGConfig1":
SUCCESS

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Click “Setup and Manage” to
access the Data Guard pages.

 Oracle Database Enterprise Edition
 Single-instance or multi-instance environment
 COMPATIBLE parameter: Set to 10.2.0.1.0 or later
for primary and standby databases
 Oracle Net Services network files: Must be
configured for the primary database and any
existing standby databases. Enterprise Manager
Grid Control configures files for new standby
databases.
 GLOBAL_DBNAME attribute: Set to a concatenation
of db_unique_name_DGMGRL.db_domain
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 DG_BROKER_START initialization parameter:
Set to TRUE
 Primary database: ARCHIVELOG mode
 All databases: MOUNT or OPEN mode
 DG_BROKER_CONFIG_FILEn: Configured for
any RAC databases
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 You must use a server parameter file (SPFILE)
for initialization parameters.
 Using the SPFILE enables the Data Guard
broker to keep its configuration file and the
database SPFILE consistent.
 If you use the broker, use Enterprise Manager
Grid Control or DGMGRL to update database
parameter values.
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1. Invoke DGMGRL and connect to the primary
database.
2. Define the configuration, including a profile for the
primary database.
3. Add standby databases to the configuration.
4. Enable the configuration, including the databases.
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DGMGRL> CREATE CONFIGURATION 'DGConfig1' AS
> PRIMARY DATABASE IS pc00prmy
> CONNECT IDENTIFIER IS pc00prmy;
Configuration "DGConfig1" created with primary database
"pc00prmy"
DGMGRL>

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DGMGRL> ADD DATABASE pc00sby1 AS
> CONNECT IDENTIFIER IS pc00sby1;
Database "pc00sby1" added
DGMGRL>

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DGMGRL> ENABLE CONFIGURATION;
Enabled.
DGMGRL> SHOW CONFIGURATION
Configuration
Name: DGConfig1
Enabled: YES
Protection Mode: MaxPerformance
Databases:
pc00prmy - Primary database
pc00sby1 - Physical standby database
Fast-Start Failover: DISABLED
Current status for "DGConfig1":
SUCCESS

 After verifying the conditions required for a switchover,
execute the SWITCHOVER command:
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DGMGRL> SWITCHOVER TO 'pc00sby1';
Performing switchover NOW, please wait...
New primary database "pc00sby1" is opening...
Operation requires shutdown of instance "pc00prmy" on
database "pc00prmy"
Shutting down instance "pc00prmy"...
ORA-01109: database not open
Database dismounted.
ORACLE instance shut down.
Operation requires startup of instance "pc00prmy" on
database "pc00prmy"
Starting instance "pc00prmy"...
ORACLE instance started.
Database mounted.
Switchover succeeded, new primary is "pc00sby1"

• To alter a database property:
• To alter the state of the standby database:
• To alter the state of the primary database:
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DGMGRL> EDIT DATABASE pc00sby1
> SET PROPERTY LogXptMode='SYNC';
DGMGRL> EDIT DATABASE pc00sby1 SET STATE='APPLY-OFF';
DGMGRL> EDIT DATABASE pc00prmy
> SET STATE='TRANSPORT-OFF';

1. Execute the FAILOVER command to initiate the
failover operation:
2. Reset the protection mode (if necessary).
3. Reinstate the primary database to serve as a
standby database in the configuration.
4. Reinstate or re-create other disabled standby
databases in the configuration.
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DGMGRL> FAILOVER TO 'pc00sby1' [IMMEDIATE];

 Disabled databases must be reinstated or re-created
to re-enable broker management.
 Reinstate a database using REINSTATE DATABASE:
 If you cannot reinstate a database, re-create it
from a copy of the primary database and then re-enable
the database by using ENABLE DATABASE:
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DGMGRL> REINSTATE DATABASE pc00prmy;
DGMGRL> ENABLE DATABASE pc00prmy;

 Disable broker management of a standby database:
DGMGRL> DISABLE DATABASE 'pc00sby1';
 Disable broker management of the configuration:
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DGMGRL> DISABLE CONFIGURATION;

 Remove a standby database from the configuration
:
 Remove broker management of the configuration:
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DGMGRL> REMOVE DATABASE 'pc00sby1';
DGMGRL> REMOVE CONFIGURATION;

• We talked about Oracle Data Guard Broker
framework
• We saw how to setup data guard broker
• we demonstrated how to switchover and
failover using the DG Broker.
• More information will be available on ilDBA
site and at my blog:
www.ildba.co.il
ZoharElkayam.wordpress.com
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Zohar Elkayam
054-4742963
zohar@brillix.co.il
www.ildba.co.il
Zoharelkayam.wordpress.com
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Oracle Data Guard Broker Webinar

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Oracle Data Guard Broker Webinar