This may result in two databases in the configuration simultaneously assuming the primary database role. Use Cloud Control or DGMGRL to perform either a complete (recommended) or an immediate failover. SQL>ALTER SYSTEM SWITCH LOGFILE; Issue the DISABLE FAST_START FAILOVER command or the DISABLE FAST_START FAILOVER FORCE command. To run an observer as a background process, use the DGMGRL command START OBSERVER IN BACKGROUND. When the primary database and the target standby database regain network connectivity, the broker will disable fast-start failover for the entire broker configuration. If the agent is not DG_BROKER_START is set to TRUE and DG_BROKER_CONFIG_FILEn are set correctly SQL> sho parameter broker alter database recover managed standby database finish; alter database activate standby database; Managed recovery process has been stopped between primary and standby database and standby becomes primary database. The observer does not attempt to reinstate the former primary database. 3. The application needs to catch this error and respond accordingly. In an Oracle Data Guard configuration, the SRVCTL -startoption for a standby database is always set to OPEN after a switchover. If a bystander standby database is not disabled by the broker during this failover, it will remain in the state it was in before the failover. In the following example, ObserverReconnect is set to 30 seconds. For example, if the old standby was a physical or snapshot standby, then the old primary must be re-created as a physical standby. If groups are not defined, you can still operate on all configurations defined in the file as a whole. This is a good time to enable FSFO to make sure that all of the prerequisites have been met. Unless action is taken to change the failover target to one of the bystanders, the new primary will be without a failover target until the former primary is reinstated as a standby. A switch-over allows the primary database to switch roles with its standby database. If the What is true about Data Guard setup with fast-start failover? Refer to the appropriate Oracle RAC or Oracle Restart documentation for further information. Observer sites monitor the fast-start failover environment. Install the DGMGRL command-line interface on the observer computer as described in Oracle Data Guard Installation. An application should use caution when calling the DBMS_DG.INITIATE_FS_FAILOVER function because the observer will initiate failover, if at all possible. The Appendix provides information oncreating a simple wrapper script to start the observer as a background process. Now your old standby database is become primary database, it is highly recommended to consider immediate full backup of primary database. specified by the ObserverPingInterval property. Reenabling Disabled Databases After a Role Change describes how to restore their viability as standby databases. This page will not allow you to alter the protection mode. For the RMAN duplicate active database method, the init.ora file (initdb1.ora in the example) requires only one parameter: db_name (it doesn't even have to be the real name of the database - any name will do). Bystander standby databases may be disabled by the broker during the failover, and they must be reinstated or re-created before they can serve as standby databases to the new primary database. If both HVR and Data Guard were running without latency or if no changes were made to the source database at the time of the failover, it can be assumed that all databases are synced and the no extra steps are necessary; the steps for Graceful Failover can be followed. 5. Have a means of notifying someone if standby apply falls too far behind. These are the actions the broker performs after you start a switchover. FS_FAILOVER_OBSERVER_HOST shows the name of the computer on which the master observer is running, FS_FAILOVER_OBSERVER_PRESENT shows whether or not the master observer is connected to the local database. You can switch back to the original Primary database later by performing another switch over. If fast-start failover is enabled and the Datafile Write Errors condition is specified, then a fast-start failover is initiated if write errors are encountered in any data files, including temp files, system data files, and undo files. Most of the network services used in a FSFO environment may use dynamic registration, but to enable Broker to restart instances during role transitions or during reinstatement after a failover, you must define a static service named db_unique_name_dgmgrl. If there are multiple observers, then only one of them is the master observer. Starting with 11 is purely cosmetic - it allows new ORL groups to be added later while keeping their group# in the same sequence as the existing ORLs. A switchover guarantees no data loss. If the configuration is not failable, the DBMS_DG.INITIATE_FS_FAILOVER function returns an ORA error number (it does not signal an exception) informing the caller that a fast-start failover could not be performed. See the START OBSERVER command for more information. Running a StatusReport on the primary should verify that the error is due to a missing observer. REINSTATE REQUIRED is present only after fast-start failover has occurred and shows on both the new primary database and the database undergoing reinstatement. Note: Many of the Broker database properties correspond to database spfile parameters. This list describes conditions in which the broker cannot automatically reinstate the former primary database. Additionally, the new master observer is identified in the output shown for the SHOW FAST_START FAILOVER and SHOW OBSERVER commands. Once Flashback Database has succeeded, the observer will convert the database to a standby, bounce it, and begin apply services. How to Test Data Guard Fast-Start Failover by Shutting Down Primary 1. The configuration status returns the SUCCESS status after the observer reestablishes its connection to the primary database, which then notifies the target standby database. The If the failover target is a logical standby database, the original primary database and all physical and snapshot standby databases in the configuration will be disabled. The Marketplace image that you use to create the VMs is Oracle:Oracle-Database-Ee:12.1..2:latest. The only exception to this is failovers to snapshot standby databases. With a value of TRUE for this property, the primary will shut down after being stalled for the number of seconds specified by the FastStartFailoverThreshold property. There can be up to four Broker can be configured to initiate failover on any of the following conditions. environment variable to specify the default location for client-side broker files. If the group name is not provided, then a new observer is started for each broker configuration defined in observer.ora. Oracle Database 10g databases running versions prior to 10.2.0.4 will remain in a stalled state until aborted or signaled to remain the primary by the observer once connectivity has been restored. This table describes the optional database properties that you can set. See the START OBSERVER The drain_timeout is specified in the SRVCTL These are the actions the broker performs after you start a complete failover. The SRVCTL utility does not automatically take the database role into account, so any time you start a service manually, you must specify the name(s) of the service you want started. Add an entry to the oratab file for the standby, db1:/u01/app/oracle/product/11.1.0/db_1:Y. This action may result in two databases in the configuration simultaneously assuming the primary database role. FastStartFailoverLagLimit property. Oracle 11g Physical standby data Guard Failover steps - Data Guard Part If you like a connect-time failover to survive across a data guard switchover, you need another way to do it. This can be done regardless of whether the failover was done to a physical, logical, or snapshot standby database. If Flashback Database history is insufficient, the observer will not be able to reinstate and you will have to manually reinstate from backup or by primary duplication. The broker allows the failover to proceed as long as there are no errors for the standby database that you selected to participate in the failover. It may be possible to convert the old Primary into a Standby database now instead of having to do a time consuming duplicate again. This is typically done for planned maintenance of the primary system. Oracle Real Application Clusters Administration and Deployment Guide for information about Application Continuity, The broker simplifies switchovers and failovers by allowing you to invoke them using a single key click in Oracle Enterprise Manager Cloud Control (Cloud Control) or a single command in the DGMGRL command-line interface (referred to in this documentation as, Ensure that the standby database you choose to be the target of fast-start failover has its, Oracle Data Guard Concepts and Administration. For example, if all your physical standbys are also unavailable, then failing over to a logical standby is your only choice. This configuration property establishes an acceptable limit, in seconds, that the standby is allowed to fall behind the primary in terms of redo applied, beyond which a fast-start failover will not be allowed. configuration scripts and checks for errors or misconfigurations. This can happen for either of the following reasons: A bystander standby database has applied more redo data than the new primary database itself had applied when it was a standby database. The price for this guarantee is increased commit latency ( log file sync waits). For example: Scenario 6: Enabling Fast-Start Failover and Starting the Observer. Make sure everything is working before moving on. See the "DISABLE FAST_START FAILOVER" command in Oracle Data Guard Command-Line Interface Reference for more information. learning with R and Python are also covered in this step-by-step tutorial. Initiate the switchover on the primary database PRIM: Remember to check Flashback Database history before aborting the primary. Ideally the primary, standby, and observer will be in geographically separate areas. Event notification and database connection failover support is available to database clients connected to local database services when a broker-managed failover occurs. It is then started and stopped on the primary database. Note that the value of the FastStartFailoverPmyShutdown configuration property must be FALSE for the primary to stall indefinitely under these conditions. In addition, some standby databases may be disabled by the broker during the failover if the broker detects that they have applied redo beyond where the new primary database had applied. Issue the following SRVCTL commands so that both databases in the Data Guard configuration know about the two potential services for each database: To start things up initially, you must manually start the services on the right node. To allow the database to register with the Data Guard listener, the listener endpoint must be added to the database's local_listener parameter. To stop the observer, see Stopping the Observer. The FastStartFailoverLagLimit configuration property is only used by the broker when enabling fast-start failover for configurations operating in maximum performance mode. How to Re-create and Reenable a Disabled Database. You can manage observers through either the Oracle Data Guard Overview pages in Cloud Control or using DGMGRL commands. files include the observer configuration file (observer.ora), observer log Complete Failovers in Configurations Using Cascaded Standbys. The minimum detection time is 6 seconds, which is the default You can perform a manual failover even if fast-start failover is enabled. A good method to determine Flashback Database storage requirements is to enable Flashback Database and observe the amount of storage it uses during several peak loads. In Maximum Availability mode, FSFO guarantees that no transaction that has received a commit acknowledgment will be lost during a failover. You cannot create the standby DB system in a different AD from the primary DB system. When this property is set to the default value of 0, it prevents the observer from periodically establishing a new connection with the primary database. Whenever possible, you should switch over to a physical standby database: If the switchover transitions a physical standby database to the primary role, then: The original primary database will be switched to a physical standby role. Use Recovery Manager (RMAN) to back up the PeopleSoft database on a regular backup schedule. [PATCH V3 0/6] ASoC: codecs: Add Awinic AW883XX audio amplifier driver The SHOW CONFIGURATION command will show you which databases can be reinstated and which databases must be re-created. WAIT option, broker waits for the amount of Depending on the failover and the types of standby databases involved, some of the databases may need to be reinstated or re-created. If the primary database has multiple standby databases, then you can specify multiple fast-start failover targets, using the FastStartFailoverTarget property. Immediately after issuing command in step 2, shut down and restart the former primary instance PRIM: The example uses 10 seconds. Such preparation includes: Ensuring that standby redo log files are configured on the primary database. Regards, Narottam Tagged: dataguard dba rac Welcome! This section lists the steps the master observer takes to determine if a fast-start failover is needed and then to perform one, if necessary. Verify there are no active users connected to the databases.