The standby VM (myVM2) has the Oracle software installed only. observer is still in contact with the standby. Now let's test switchover in the other direction. 1)What are the steps to do Switchover/Failover operation manually in 2-node RAC and 2-node DATAGUARD environment. Instead, when broker notifies the Oracle Refer to the appropriate Oracle RAC or Oracle Restart documentation for further information. The former primary database is disabled. This database property is used to specify how the observer should connect to and monitor the primary and standby database. The standby can be physical or logical and there can be multiple standbys, but only one of the standbys can be the failover target at any given time. Add an entry to the oratab file for the standby, db1:/u01/app/oracle/product/11.1.0/db_1:Y. For systems with multiple RAID controllers, consider creating SRLs such that their IO is balanced across the controllers. The new ConfigurationWideServiceName configuration property can be used to simplify setting up this connect identifier. standby database is mounted, broker remembers this setting. If fast-start failover is already enabled, the If you are performing an immediate failover, then the database role is changed to primary without applying any accumulated redo data. The syntax for the configuration declaration is: The definition for each broker configuration is: The configuration-name can be different from the name defined in the metadata of the Data Guard Broker configuration. To avoid problems due to timing variations, values less than 60 minutes are not recommended and values of 30 or less virtually guarantee Flashback Database failure. This file contains connect identifiers to both the primary and the target standby databases. Prerequisites for Enabling Fast-Start Failover provides complete information about all of the fast-start failover and reinstatement requirements. The example assumes that the standby uses the same directory structure as the primary. When performing a switchover in a configuration whose standby databases are . Upon detecting the break in communication, the observer attempts to reestablish a connection with the primary database for the amount of time defined by the FastStartFailoverThreshold property before initiating a fast-start failover. Provides an automatic failover FastStartFailoverLagLimit configuration property. See the Cloud Control online help for more information. Check the database role,open_mode in standby server. the names of the scripts created in the previous step. STOP OBSERVING, and SET Provides an automatic failover environment that Once the observer has initiated a fast-start failover, the primary database shuts down automatically. The role change is directed to the same standby database that was specified for the FastStartFailoverTarget database property on the primary database. Many customers use Oracle Database deployed on Amazon Elastic Compute Cloud (Amazon EC2) to run their Oracle E-Business Suite applications. Sign in to Azure services. Enable Fast-Start Failover Using Cloud Control. A switchover is a role reversal between the primary database and one of its standby databases. primary database must have network connectivity. (If there are other conditions, unique to an application, that would warrant a fast-start failover then the application can be set up to call the DBMS_DG.INITIATE_FS_FAILOVER function and start a fast-start failover immediately should any of those conditions occur. If you don't already have a Flash Recovery Area (FRA), you will need to create one for Flashback Database. The broker interacts with Oracle Clusterware or Oracle Restart to ensure that the appropriate database services are active and that the appropriate FAN events are published after a role change. It is then started and stopped on the primary database. The observer is perfectly satisfied if all of the redo it needs to meet your durability requirements has been received by the failover target. To stop the observer, see Stopping the Observer. The broker selects a target based on the order in which they are specified on the FaststartFailoverTarget property. The default value is 30 seconds and the lowest possible value is 5 seconds. lower detection times for primary database failures. The ObserverOverride and ObserverReconnect properties allow you additional control over the connection to the primary. If both the observer and designated standby database lose connectivity with the primary database for longer than the number of seconds specified by the FastStartFailoverThreshold configuration property, the observer will initiate a fast-start failover to the standby database. Configure Data Guard Broker to manage and monitor the Data Guard configuration. If the configuration contains both physical and logical standby databases, consider choosing a physical standby database (that has the least amount of unapplied redo) to be the target standby database. Broker Configuration Has Multiple Registered Observers. If you are performing a complete failover, then all accumulated redo data is applied before the database role is changed to primary. primary, only the observers specified in the property can be use in the SET Event notification and database connection failover support is available to database clients connected to local database services when a broker-managed failover occurs. Table 6-3 FS_FAILOVER_OBSERVER_PRESENT Column of the V$DATABASE View, The master observer is currently connected to the local database, The master observer is not connected to the local database. It uses the connect identifier specified in the observer configuration file to locate the credentials for a broker configuration from the Oracle wallet. All other registered observers are considered to be backup observers. The simple tests described in this guide are fine for making sure the basics are working, but you'll probably want to develop a more comprehensive set of tests suited to your environment and requirements. The following sections describe how to perform manual failovers: Reenabling Disabled Databases After a Role Change. The example below takes advantage of the 11g RMAN Active Database Duplication feature. Maximum Availability mode uses synchronous redo transfer and FSFO imposes the additional requirement that the redo is recorded in the standby redo log (SRL) of the target standby (AFFIRM option of log_archive_dest_ n). When a serious condition uniquely known to an application is detected, the application can call the DBMS_DG.INITIATE_FS_FAILOVER function to initiate an immediate fast-start failover. By default the file is named fsfo.dat and is created in the working directory where the observer is started. Otherwise, they must be re-created from a copy of the new primary database. All Data Guard environments should enable force logging at the database level in order to guard against nologging tablespaces from being added. configuration named ConfigurationSimpleName. This section describes how to stay on top of your FSFO environments. Stores the observer runtime data file and observer configuration file in If the broker performs a switchover or failover, then it starts the service SALESRW or SALESRO based on the current role of the database. Oracle Data Guard helps you change the role of databases between primary and standby using either a switchover or failover operation. If the WAIT option is included in the A switchover guarantees no data loss and is typically done for planned maintenance of the primary system. The value specified for either of these properties should allow the master observer to connect to any instance of an Oracle RAC database. Create a unique connect alias for each database. The broker allows the switchover to proceed as long as there are no errors for the primary database and the standby database that you selected to participate in the switchover operation. If you have not used the SET ObserverConfigFile command after starting the current DGMGRL client, then the result will always be: ObserverConfigFile=observer.ora. The guide attempts to be operating system agnostic; however, some examples may contain platform specific elements such as path and file naming conventions. fsfo_hostname.dat. In the event of a In such a case, no attempt is made to transmit any unsent redo from the cascader to the terminal standby. A normal shutdown prevents a fast-start failover until the primary database and standby database are connected and communicating again. SQL> Select Database_role from v$Database; Hi, I am working in IT industry with having more than 10 year of experience, worked as an Oracle DBA with a Company and handling different databases like Oracle, SQL Server , DB2 etc For Active Oracle Data Guard, it will fail to open up a connection unless its in read-only mode. There can be up to four DGMGRL. These are the actions the broker performs after you start a switchover. The failed primary database requires reinstatement as a new standby database to the new primary. If the FastStartFailoverPmyShutdown configuration property is set to TRUE, then the former primary database will have been automatically shut down and must be manually restarted before the master observer can attempt to reinstate it. Worked as a Development and Database Administrator. When DGMGRL starts, if the DG_ADMIN fast-start failover operation, the observer checks if a fast-start failover performance protection mode with fast-start failover. This This function can be called from a connection to either the primary or any standby in the configuration. However, if you want the observer to reconnect to the primary database periodically as a means of testing the health of the network connection to the primary, then use the ObserverReconnect configuration property. This configuration property causes the former primary database to be automatically reinstated if a fast-start failover was initiated because the primary database was either isolated or had crashed. Presetting database properties related to redo transport services, such as LogXptMode, NetTimeout, StandbyArchiveLocation, StandbyAlternateLocation, and RedoRoutes. The old Primary must have been running in flashback mode before the failover. Valid values are >= 10. Verifies that the primary and the target standby databases are in the following states: The primary database is enabled and is in the TRANSPORT-ON state. There are configuration requirements that must be met in order to publish and properly handle FAN events generated as the result of a broker-managed failover. (Snapshot standbys are not included in the table because they are not supported as fast-start failover targets.). Only the master observer can coordinate fast-start failover with Data Guard broker. If the specified log file is not accessible, or the LOGFILE IS option is not used, then the observer output is sent to standard output. If you do not want to use the default, you can define a specific group. Use the Cloud Control Fast-Start Failover wizard or the DGMGRL ENABLE FAST_START FAILOVER command to enable fast-start failover. 12c Dataguard, In Note that if failover was performed on a snapshot standby database, the old primary must be either reinstated or re-created as a physical standby database. In an immediate failover, it is also possible to failover to a standby database (terminal standby) that gets redo from another standby database (cascader). Services that must be active in any given database role (primary, physical standby, logical standby, or snapshot standby) must be configured with the Server Control utility (SRVCTL) explicitly on each database where the service must be active. To allow the master observer to automatically reinstate the former primary database, the database must be started and mounted. Monitoring flashback database history and reacting when it drops below 30 minutes will save you time and improve availability.