data guard failover steps

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. These tasks assume that you are connected as SYS or SYSDG and that a primary and standby database are already set up in a broker configuration. Application calls to DBMS_DG.INITIATE_FS_FAILOVER. For more details about managing redo transport services using database properties, see Managing Redo Transport Services. This post will demonstrate the procedure to test Oracle Data Guard Fast-Start Failover by shutting down the server where the primary database is running from. The walkthrough begins with a single database that will become the primary of a Data Guard configuration. FastStartFailoverLagLimit configuration property is set to zero) or During a switchover, the primary database transitions to a standby role, and the standby database transitions to the primary role. However, re-enabling Flashback Database will require a bounce since the database must be mounted and not open. This configuration property causes the primary database to shut down if fast-start failover is enabled and V$DATABASE.FS_FAILOVER_STATUS indicates the primary has been STALLED for longer than FastStartFailoverThreshold seconds. This results in the observer establishing a new connection to the primary database every 30 seconds. Do this prior to every failover test. Some properties have changed between those releases. Issue the following SRVCTL commands: Now the correct services are running on the correct databases. Stopping the observer does not disable fast-start failover. If you will be using RMAN to create the standby database, it also needs a static service to restart the database being created. There are many examples, and Ritesh Chhajer offers this example of doing a Data Guard switchover using dgmgrl: 1. You can customize fast-start failover setup for a specific application by using the DBMS_DG PL/SQL package. To maintain a viable disaster-recovery solution in the event of another disaster, you may need to perform additional steps. Download Ebook Oracle 11g 12c Data Guard With Asm Lab Practice A To optimize the log apply rate: Do not configure the DelayMins database property to delay applying archived redo log files to the standby database (see Managing Log Apply Services for more information). Switchover to a logical standby database is disallowed when the configuration is operating in maximum protection mode. After a failover, the broker publishes Fast Application Notification (FAN) events. operation. If no name is specified for the observer then a default observer name, the host name of machine where the START OBSERVER command is issued, is used. There is little risk in enabling Flashback Database to determine its storage requirements - it can be disabled while the primary is open if necessary. In this example, there are 3 ORLs with a max group# of 3. When enabled, re-create the standby database. Failing over the database won't do much good if applications and other database clients don't know where the primary went. When a fast-start failover occurs because either a user configurable fast-start failover condition is detected or an application initiates a fast-start failover by calling the DBMS_DG.INITIATE_FS_FAILOVER function, the former primary database is always shut down and never automatically reinstated. environment variable to specify the default location for client-side broker files. Oracle recommends that this property be set to a value that is small enough to allow timely detection of faults at the primary database, but large enough to limit the overhead associated with periodic observer connections to an acceptable level. How to Enable Fast-Start Failover in Oracle Data Guard The observer is the key element that separates Data Guard failover from its pre-FSFO role as the plan of last resort to its leading role in a robust high availability solution. drain_timeout amongst the active services. Make sure the last redo data transmitted from the Primary database was applied on the standby database. ObserverPingRetry properties before LinkedIn:https://www.linkedin.com/in/hari-prasath-aa65bb19/ See Directing a Fast-Start Failover From an Application). So SALESRW will start on CHICAGO (which is now the primary) and SALESRO will start on BOSTON (which is now the physical standby). 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. configuration named ConfigurationSimpleName. observer name, host, whether it is the master observer, when it became the master The minimum Implementing Oracle Data Guard Broker 19c in an Oracle Standby RAC Syntax for Mandatory Configuration Declaration. If you do not want to use the default, you can define a specific group. To maximize the benefits of FSFO, the observer should run on a different host than the primary and standby databases. 1. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. See Troubleshooting Problems During a Switchover Operation for more information. ObserverConnectIdentifier allows you to specify different connect identifiers for the observer to use. How to Implement Fast-Start Failover 11g - Ed Chen Logic Step-B: Copy control file to temporary location on primary database. The connect descriptor must contain the SERVICE_NAME parameter in either case. computer, it automatically starts the observer when you enable You can also reinstate bystander standby databases that were disabled during a failover operation. Reinstate or re-create standby databases in the configuration that were disabled by the broker. Now your old standby database is become primary database, it is highly recommended to consider immediate full backup of primary database. Check the spelling of your keyword search. configuration file, and fast-start failover callout script files. flashback logs on that database. 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. Note: Many of the Broker database properties correspond to database spfile parameters. See Performing Manual Role Changes When Fast-Start Failover Is Enabled for more information. The broker allows an immediate failover to proceed even if there are errors present on the standby database that you selected to participate in the failover. instructions for the DGMGRL command-line interface. The new primary database is opened in read/write mode and redo transport services are started. 12c Dataguard, In The default name for See Installing and Starting the Observer. *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 . If the primary database has multiple standby databases, then you can specify multiple fast-start failover targets, using the FastStartFailoverTarget property. By default, the observer uses the same connect identifiers used by Data Guard for redo transfer and information exchange between the primary and standby ( DGConnectIdentifier in Oracle Database 11g, InitialConnectIdentifier in Oracle Database 10g). required permissions, the admin folder is created Remote login is required, along with a password file, to allow the databases in a Data Guard configuration to connect to each other. Disaster Recovery with Oracle Data Guard - online presentation You must use the Oracle wallet to store the credentials for all broker configurations to be managed. It doesn't consider how much of that redo has been applied. 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. Learn how to use Oracle Data Guard broker to manage databases during switchover and failover. You can use the SHOW CONFIGURATION WHEN PRIMARY IS command to show the redo transport configuration (based on each member's setting of the RedoRoutes property) that would be in effect if the specified database were the primary database. These are the actions the broker performs after you start a switchover. If that metadata is pushed out, Oracle can no longer find a fuzzy snapshot so it will not be able to flash back. configuration property. Monitoring flashback database history and reacting when it drops below 30 minutes will save you time and improve availability. If the primary or target standby databases lose connections to all backup observers, then the broker does not try to nominate a backup observer as the new master observer, and the broker reports that the configuration is not observed. The observer does not attempt to reinstate the former primary database. It is very much useful, when the organization has multiple standby sites. In addition to setting the configuration protection mode to maximum performance, you will also need to ensure that the LogXptMode database property for both the primary and target standby database is set to ASYNC. directory. On the Data Guard Failover Confirmation page, specify the type of failover that you want to perform: Complete: All available redo is applied on the standby database. The group of broker configurations to be managed is declared in the observer configuration file. Once the observer is started, you cannot change the file's name and location. file (fsfo.dat). milliseconds. Notice that the former primary is now disabled. 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. As a result, there is no guarantee that the observer will not perform a fast-start failover to the target standby database if the observer determines that conditions warrant a failover. A failover to a physical standby database is preferable because it is likely that all standby databases in the configuration will still be available as standby databases to the new primary database after the failover operation completes. Ideally the primary, standby, and observer will be in geographically separate areas. Broker will set the primary to use asynchronous log transport by default. Oracle Data Guard configuration with DGMGRL. through these services to exit or for the specified wait time Most in-progress failures cannot be restarted (for example, archived redo log file corruption on the primary database). See Oracle Enterprise Manager Command Line Interface. Alternatively, you can query the V$DATABASE view on the target standby database. If failover is not possible for some reason, then the master observer will continue checking whether the standby database is ready to fail over. Note that the FastStartFailoverThreshold property can be changed even when fast-start failover is enabled. To run an observer as a background process, use the DGMGRL command START OBSERVER IN BACKGROUND. Reinstatement restores high availability to the broker configuration so that, in the event of a failure of the new primary database, another fast-start failover can occur. the observer configuration file is observer.ora. Setting it to 'FALSE' leaves the database open and stalled until it is terminated or signaled to proceed in the event a failover did not take place (e.g. Each group that you define must have at least one broker configuration. Note that a switchover operation may be started before the specified wait Standby databases that are disabled during switchover, manual failover, or fast-start failover will not be automatically reinstated. Set this property for the primary and target standby database if you want the observer to use a different connect identifier than that used to ship redo data (that is, the connect identifier specified by the DGConnectIdentifier property). an alias of the broker configuration name. Enable Fast-Start Failover Using Cloud Control. Disabling Fast-Start Failover Using Cloud Control. This article - the seventh in this ongoing . It is possible to manually perform a completer failover to a standby database that receives redo data from a far sync instance. Verify there are no active users connected to the databases. Controlfile is permanently damaged because of a disk failure. A switchover guarantees no data loss and is typically done for planned maintenance of the primary system. Create or update the fast-start failover callout configuration file and include Check the Undo tablespace Usage in Oracle, Exclude/Include option in EXPDP and IMPDP Datapump, Missing Dependencies Python Core / win32api, Stop the EXPDP/IMPDP Datapump Job in Oracle, Find the temp usage by sessions in Oracle, Create & grant permission to directory in Oracle, Check the Patch Applied to the Oracle Database. 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. To see the specific parameter, use the "show database StatusReport" command. fast-start failover through Cloud Control. It has two parts in the following order: Configuration declaration this section is mandatory. To stop a specific observer when there are multiple registered observers running, issue the following command: You can log into DGMGRL from any machine to stop an observer. The example uses the FROM ACTIVE DATABASE clause introduced in 11g that allows RMAN to create a standby database by copying the primary across the network without the need to store the backup files on disk or tape. The logs also contain other details about the actions that will be performed in case of a failover. Displays the current fast-start failover mode. The word manual is used to contrast this type of failover with a fast-start failover (described in Fast-Start Failover). The other configurations that are not required but they might make your fast-start failover go smoothly.