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FastStartFailoverAutoReinstate is set to FALSE, Another failover or switchover occurred after the fast-start failover completed but before the former primary database restarted, The master observer cannot connect to the former primary database, The former primary database cannot connect to the new primary database, The former primary database and the new primary database are not configured in the same fast-start failover environment, The former primary database was disabled because of a manual failover when fast-start failover was disabled. Displays if the standby database's redo applied point does not lag the primary database's redo generation point by more than the number of seconds specified by the FastStartFailoverLagLimit configuration property and the configuration is operating in maximum performance mode. DG_BROKER_START is set to TRUE and DG_BROKER_CONFIG_FILEn are set correctly SQL> sho parameter broker If the value is non-zero, failover is possible any time the standby database's apply SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE FINISH; An existing connection which is already closed from the database side would throw an error. See Choosing a Target Standby Database for helpful advice. Table 6-2 FS_FAILOVER_STATUS Column of the V$DATABASE View. The FastStartFailoverThreshold time interval starts when the observer first detects there might be a failure with the primary database. If a database must be re-created from a copy of the new primary database, it will have the following status: Re-create the standby database from a copy of the primary database and then reenable it, as described in How to Re-create and Reenable a Disabled Database. You cannot perform a switchover to a snapshot standby database unless you first convert it back to a physical standby database. The procedure for using RMAN to create a standby database is fully explained in Appendix F of Oracle Oracle Data Guard Concepts and Administration document (10g Rel 2 and 11g Rel 1). The foundation of FSFO is Data Guard - a primary and at least one standby. See the START OBSERVER command for more information. If you expect the network to be disconnected for a long time and A database in the primary role will not open until it has verified with the observer that it is still the primary. DG BrokerDG BrokerData Guard BrokerOracleDGRMAN Duplicate . To determine if the configuration is ready for fast-start failover to occur, issue the DGMGRL SHOW DATABASE command, or query the V$DATABASE view on either the primary or target standby databases. directory does not have the required permissions, broker does the following: When you run DGMGRL commands, if a path and file name are explicitly specified for to set the time taken to detect a failure on the primary database: Set the FastStartFailoverThreshold If you re-create the old primary database, it must be created as the standby type of the old standby database. Administration at the target standby site should be as comprehensive as that at the primary site because the standby database may assume the primary role without prior notice. become the master observer. Oracle 12c-Step by Step Manual Data Guard Failover. Presetting database properties related to redo transport services, such as LogXptMode, NetTimeout, StandbyArchiveLocation, StandbyAlternateLocation, and RedoRoutes. In Oracle Database 11g, the password file on the standby must be a physical copy of the password file on the primary due to security enhancements introduced in Oracle Database 11g. The ObserverOverride configuration property, when set to TRUE, allows an automatic failover to occur when the observer has lost connectivity to the primary, even if the standby has a healthy connection to the primary. Reinstatement is supported only after failover in a broker configuration. SQL>ALTER SYSTEM SWITCH LOGFILE; While this eliminates the processing overhead associated with periodically establishing a new observer connection to the primary database, it also prevents the observer from detecting that it is not possible to create new connections to the primary database. The OberverPingRetry property specifies the number of Currently, this state can be detected only when the database is open. Standby databases not involved in the switchover (known as bystander standby databases) continue operating in the state they were in before the switchover occurred and will automatically begin applying redo data received from the new primary database. 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. We'll start with switchovers. 1. In this case, the primary database stalls and prevents any further transactions from process. milliseconds. If fast-start failover is enabled, then a switchover can be performed only to the pre-specified target standby database and only if the standby database is synchronized with the primary database or is within the configured lag limit, for the max availability and max performance modes respectively. You can enable fast-start failover from any site while connected to any database in the broker configuration. FastStartFailoverLagLimit By default, the broker always determines whether bystander standby databases will be viable standby databases for the new primary when performing a complete failover. Required fields are marked *. Valid values are >= 100. Flashback Database is a continuous data protection (CDP) solution integrated with the Oracle Database. DGConnectIdentifier, "Scenario 9: Performing a Switchover Operation" for an example of using the VALIDATE DATABASE command to show a database's readiness to complete a role switchover, "Scenario 10: Performing a Manual Failover Operation" for an example of using the VALIDATE DATABASE command to show a database's readiness to complete a role failover. This is to ensure that the service definition gets propagated to the physical standby database via the redo stream and thus allows for the service to be started on the physical standby database. To stop the observer, see Stopping the Observer. time specified by maximum configured directory. Switches roles between the primary and standby databases. Duplicate configuration names in configuration definitions are not allowed. Initiate reinstatement by mounting the database. ObserverConnectIdentifier allows you to specify different connect identifiers for the observer to use. It can be useful to perform such queries because fast-start failovers are fully automated and can occur at any time. Manual Failover in Data Guard - ORACLE-HELP Fast-start failover is inhibited in this case. When the observer loses its connection to the primary database for a period of time greater than that specified by the FastStartFailoverThreshold property, it attempts a failover to the standby database. Observer uses the value of the DGConnectIdentifier property to connect to and monitor the primary and target standby databases. The same thing happens if a shutdown and startup of either database occurs - the service that is started is the one that matches the role of the database being started. If one of these errors has occurred, follow the guidelines in "Resolving ORA-752 or ORA-600 [3020] During Standby Recovery" in My Oracle Support Note 1265884.1 before proceeding. Note: Data Guard requires dedicated server connections for proper operation. Enable Fast-Start Failover Using Cloud Control. Table 6-1 Content of Default Directory for Client-side Files, Contains the observer configuration file that is used by In this mode, the FastStartFailoverLagLimit configuration property is set to zero. This section describes how to configure an Oracle Net connect descriptor that meets this requirement. Contains the observer log file for the broker configuration named This allows the appropriate Data Guard services, such as redo transport or redo apply, to be started when the database is restarted later for any reason. There may or may not be data loss depending upon whether your primary and target standby databases were synchronized at the time of the primary database failure. They must be re-created from a copy of the new primary database. If errors occur during the disable operation, the broker returns an error message and stops the disable operation. To reenable broker management of these databases, you must reinstate or re-create the databases using one of the following procedures: If a database can be reinstated, the database will show the following status: Reinstate the database using the DGMGRL REINSTATE DATABASE command or the reinstate option in Cloud Control, as described in How to Reinstate a Database. To allow the master observer to automatically reinstate the former primary database, the database must be started and mounted. file, observer runtime data file (fsfo.dat), fast-start failover callout You can start the observer before or after you enable The observer automatically starts the reinstatement process. Chapter 9 of the Data Guard Broker documentation (10g and 11g) contains a description of each property. If there are physical or snapshot standby databases in the configuration and the switchover occurs to a logical standby database, you need to re-create those databases from a copy of the new primary database and then reenable those databases, as described in Reenabling Disabled Databases After a Role Change. Switchover Steps. In an immediate failover, it is also possible to failover to a standby database (terminal standby) that gets redo from another standby database (cascader). If the switchover occurs to a physical standby database, and the former primary Execute the following on primary database NORTH: Execute the following on the physical standby database SOUTH: If the broker now performs a switchover or failover, it automatically starts the SALES service on the correct database, based on the database's role. But it will also continue trying to reconnect to the primary database indefinitely. You want to prevent fast-start failover from occurring because the primary database will resume service soon.

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