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Fast-Start Failover
Oracle Data Guard 10g Release 2
Fast-Start Failover – an Overview .................................................................. 3
User Experience with Fast-Start Failover...................................................... 3
Amazon.com And Data Guard Automatic Failover ............................... 4
Configuring Fast-Start failover........................................................................ 5
Events That Trigger Fast-Start Failover ........................................................ 7
Fast-Start Failover Following Primary Database Failures....................... 7
Fast-Start Failover and Network Disconnects ......................................... 8
Oracle Test Results ......................................................................................... 10
Reinstatement after a Fast-Start Failover..................................................... 11
Oracle Best Practices for Fast-Start Failover .............................................. 11
Primary Configuration ............................................................................... 11
Standby Configuration ............................................................................... 12
Network Transport..................................................................................... 12
Observer....................................................................................................... 13
Fast-Start Failover Threshold ................................................................... 13
Monitoring ................................................................................................... 14
Flashback Database Configuration .......................................................... 14
Configurations with Multiple Standbys ................................................... 14
Applications well suited to Fast-Start Failover....................................... 15
Automatic Client Failover.............................................................................. 15
Data Guard Role Transition Events ........................................................ 15
DB_ROLE_CHANGE Event................................................................. 16
DB_DOWN Event .................................................................................... 16
Application Notification............................................................................ 16
Example: Configuring Automatic Failover ................................................. 17
Configuring for Transparent Client Failover.......................................... 18
Create a primary specific service .............................................................. 18
Configure Oracle Net Service for External Procedures ....................... 18
Create necessary support files for LDAP modification ........................ 20
Define a middle tier / application restart script..................................... 21
Create database DB_ROLE_CHANGE trigger.................................... 21
Conclusion........................................................................................................ 22
References ........................................................................................................ 23
Fast-Start Failover – Oracle Data Guard 10g Release 2 Page 3
Fast-Start Failover
Oracle Data Guard 10g Release 2
FAST-START FAILOVER – AN OVERVIEW
Oracle Data Guard[1] is the management, monitoring, and automation software
infrastructure that creates, maintains, and monitors one or more standby databases
to protect enterprise data from failures, disasters, errors, and corruptions.
Data Guard maintains these standby databases as transaction consistent copies of
the production database. These standby databases can be located at remote disaster
recovery sites thousands of miles away from the production data center, or they
may be located in the same city, same campus, or even in the same building. If the
production database becomes unavailable because of a planned or an unplanned
outage, Data Guard can switch any standby database to the production role, thus
minimizing the downtime associated with the outage, and preventing any data loss.
Fast-start Failover is a new Oracle Data Guard 10g Release 2 feature that provides
the ability to automatically, quickly, and reliably fail over to a designated,
synchronized standby database in the event of loss of the primary database,
without requiring manual intervention to execute the failover.
In addition, following a fast-start failover the old primary database is automatically
reconfigured as a new standby database upon reconnection to the configuration.
This enables Data Guard to restore disaster protection in the configuration easily,
　
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