data guard failover steps

Reference architectures for Oracle databases on Azure - Azure Virtual You can query the V$FS_FAILOVER_STATS view on the primary database to display statistics about fast-start failovers that have occurred on the system. Use the EMCLI verb dg_configure_observers. Database services can be configured to be active in specific database roles on Oracle RAC databases and on single-instance databases managed by Oracle Restart. Steps for FAILOVER the Dataguard environment What is true about data guard set up with fast-start failover (FSFO) in Oracle Cloud Infrastructure (OCI)? Note that the broker does not use the properties to set up redo transport services and Redo Apply services until you actually switch over the primary database to the standby role. data (in seconds) specified by the If multiple observers have been started for the configuration, then be sure to specify the name of the observer whose environment is to be patched (STOP OBSERVER observer-name). If Flashback Database fails, automatic reinstatement stops and you will have to perform a manual SCN-based recovery to the standby_became_primary_scn and complete the reinstatement. See Sources of Diagnostic Information for details about the broker's drc* log files. To stop an observer currently designated as the master observer, first issue the SET MASTEROBSERVER command to designate a different observer as master observer. You can also reinstate bystander standby databases that were disabled during a failover operation. The default In a DataGuard environment when the Primary instance fails you need to go through the Failover and Reinstate processes in order to restore the database service, as described in the documentation: Changes a standby database to the primary role in response to a primary database failure. The failover was to a logical standby database. Verify the target standby database is ready for failover. an alias of the broker configuration name. The platform provides comprehensive services such as maintaining and monitoring databases to help the oracle databases in surviving during data corruption. The FastStartFailoverTarget configuration property on the primary unless the new property value contains the current fast-start failover target. If a fast-start failover was initiated because the primary database had crashed or lost connectivity with the master observer and target standby database, then the master observer automatically attempts to reinstate the former primary database as a standby database, if the FastStartFailoverAutoReinstate configuration property is set to TRUE. variable must have read, write, and execute permissions for the directory owner Determine the number and size of the Online Redo Log files (ORLs). A database in the primary role will not open until it has verified with the observer that it is still the primary. The walkthrough begins with a single database that will become the primary of a Data Guard configuration. 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 observer host is 'observer.demo.org'. To start the observer with DGMGRL, issue the following The group of broker configurations to be managed is declared in the observer configuration file. The total storage requirement is proportional to the number of distinct blocks changed during snapshots - e.g. Bystander standby databases that are not disabled by the broker after the switchover will continue operating in the state they were in before the switchover. Cloud Control will start the observer. To perform specified actions before or after a fast-start failover For information about event notification and database connection failover support for global services, see the Oracle Database Global Data Services Concepts and Administration Guide. This means that in order for a flashback database operation to succeed, observer and the standby both lose contact with the primary. For switchovers, understanding all of the factors can simplify the choice of which standby database to consider as your new primary database. In an environment where there are multiple observers configured, stopping the master observer is not allowed unless it is the last running observer. After the broker receives the STOP OBSERVER request, the request is passed to the observer the next time the observer contacts the broker, and the observer then stops itself. /home1/dataguard/config_NorthSales/callout/fsfocallout.ora. A number of prerequisites must be met on the primary in order to use Fast-Start Failover. If the database is managed by Oracle Clusterware, broker does not open any of the restart the new physical standby database. 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. If the broker performs a switchover or failover, then it starts the service SALESRW or SALESRO based on the current role of the database. Automatic failover quickly and reliably fails over the standby Autonomous database to the primary database role, without requiring you to perform any manual steps. Choosing the standby database with the smallest transport lag can minimize the amount of data loss and in some cases, incur no data loss at all. 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). If necessary, you can shut down the primary or target standby database in a fast-start failover environment. Oracle Database 11g FSFO adds support for Maximum Performance mode (async redo transfer), providing the flexibility to trade durability for performance. Fast-start failover can be used only in a broker configuration and can be configured only through DGMGRL or Cloud Control. observer as a foreground process. They must be re-created from a copy of the new primary database. In the following example, ObserverReconnect is set to 30 seconds. 1 second. In such a case, no attempt is made to transmit any unsent redo from the cascader to the terminal standby. However, you can change the name or the location of the file if you start the observer using the DGMGRL START OBSERVER command and include the FILE IS qualifier. time, if all the sessions that are connected though the active services set the ObserverPingInterval and Let's run the command on the primary database to validate if the environments are ready for the role transition : JITPRD> alter database switchover to JITSDB verify; alter database switchover to JITSDB verify * ERROR at line 1: ORA-16475: succeeded with warnings, check alert log for more details 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. callout directory. LGWR is unable to write to any member of the log group because on an I/O error. This is typically done for planned maintenance of the primary system. After an immediate failover completes, all the standby databases in the configuration, regardless of their type, are disabled. Oracle Database 10g allows a different password file to be used as long as the SYS passwords are the same on the primary and standby. If a single-instance primary database (either Oracle RAC or non-Oracle RAC), or if all instances of an Oracle RAC primary database are shut down with the ABORT option, the observer attempts a fast-start failover. How To Use Local Data Processing and Oracle Data Guard for Source However, there may be situations in which you must disable fast-start failover when If block change tracking is enabled on the primary, and the target See Oracle Enterprise Manager Command Line Interface. Starting the Observer as a Background Process Using How to Re-create and Reenable a Disabled Database. The ObserverPingInterval Ensure that the required permissions are granted to the DG_ADMIN The default name of the callout configuration file is We'll leave the other properties at their default values for the walkthrough, but you should become familiar with all of the Broker config and database properties. 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. The remaining Data Guard-related parameters will be set by Broker later in the walkthrough. Duplicate configuration names in configuration definitions are not allowed. This is because the -role qualifier is taken into account only by Data Guard broker, and at database startup. Albino DeSantis - Senior System Engineer - US Coast Guard - LinkedIn Start the observer by running dgmgrl and logging in using SYS credentials. This can be avoided by first disabling fast-start failover with the FORCE option on the target standby. Reinstatement is supported only after failover in a broker configuration. The command fails if the file does not exist. For example, if the old standby was a physical or snapshot standby, then the old primary must be re-created as a physical standby. In short, the failover is the deformation of the production (primary) database and activating standby database as the primary. It is important that all SRVCTL add service options be identical on all the databases so that the services behave the same way before and after a role change. The configuration and database status report that the observer is not running and return one of the following status messages: While the configuration is in the unobserved state, fast-start failover cannot happen. 2. Post failover, there are two methods of rebuilding your failed primary Method 1: Rebuild from scratch -> RMAN duplicate Method 2: Flashback database -> only if Flashback was enabled Reinstate failed primary: When you use data guard broker, with just one command, the primary can be rebuilt. No two observers on the same Data Guard Broker configuration can have the same name. You can switch back to the original primary and then either retry the switchover to the original target standby, or choose another standby in the configuration to switch over to. *PATCH V3 0/6] ASoC: codecs: Add Awinic AW883XX audio amplifier driver [not found] <000701d8e7521f78bc05e6a340awinic.com> @ 2022-11-11 11:26 ` wangweidong.a 2022-11 . Fast-start failover will not be attempted for the other types of database shutdown (NORMAL, IMMEDIATE, TRANSACTIONAL). See the Cloud Control online help for more information. Then, on the Fast-Start Failover Change Mode page, click Enabled. through these services to exit or for the specified wait time There can be up to four Note that the FastStartFailoverThreshold property can be changed even when fast-start failover is enabled. Data Guard. Immediate Failovers in Configurations Using Far Sync Instances. We'll start it interactively for now to verify that everything's working. By choosing the standby database with the least amount of unapplied redo, you can minimize the overall time it takes to complete the switchover operation. Refer to the appropriate Oracle RAC or Oracle Restart documentation for further information. instructions for the DGMGRL command-line interface. Stopping the observer does not disable fast-start failover. More specifically, we can have an asynchronous second read-only Managed instance in the same or in a different region. Sign in to Azure present, you must start the observer manually using the following The broker automatically reenables the database as part of reinstating it. Whereas a switchover to a logical standby database will invalidate and disable all of the physical and snapshot standby databases in the configuration. 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. Oracle Data Guard is a solution provider to businesses by offering data protection and its disaster recovery along with its high availability. The examples shown in this section do not necessarily show the specific attributes you might need to use in your own environment. See the START OBSERVER command for more information. Installing and starting an observer is an integral part of using fast-start failover and is described in detail in the following sections: Oracle Data Guard Installation explains that you can either install only the Oracle Client Administrator or you can install the complete Oracle Database Enterprise Edition or Personal Edition on the observer system. 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. Broker will validate the configuration, set parameters on both databases, and start managed recovery. It's a good idea to have at least two hosts configured to run observers so that one can take over if the other fails. To enable fast-start failover, both the primary and target standby databases must be running and have connectivity, and satisfy all of the prerequisite conditions listed in Prerequisites for Enabling Fast-Start Failover. If fast-start failover is already enabled, the This exercises the configuration, but triggers failover differently than losing contact with the primary. For Oracle RAC databases, see Oracle Real Application Clusters Administration and Deployment Guide for more information about configuring database services with the SRVCTL utility. You must determine which available standby databases should be targets for failover. To issue commands and interact with the To switchover to a standby that is not the current failover target: John Smiley [jrsmiley@gmail.com] is a persistent storage architect for a major online retailer. If the observer is unable to regain a connection to the primary database within the specified time, then the observer begins a fast-start failover provided the standby database is ready to fail over. FSFO can provide substantial gains in high availability and disaster recovery preparedness for all environments, from inexpensive Cloud-based systems to global distributed data centers. The services include switchover, switchback and failover. Oracle Data Guard Manual Failover - ORACLEAGENT BLOG Enable Active Data Guard for read-only workloads. Data Guard broker publishes this service on each instance as it comes up and broker management of the instance is initialized: To patch an environment where the Observer is running and fast-start failover is enabled, follow these steps prior to applying the patch. You might, for instance, use this to allow the observer to monitor the databases using the same connect identifiers as the client applications. However the target can receive redo from a far sync instance.).

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