JAVA applications can use FAN programmatically by using the JDBC FAN application programming interface to subscribe to FAN events and to execute event handling actions upon the receipt of an event. There's a big difference between a system that's FSFO enabled and one that's FSFO ready. Data Guard Failover to physical standby Tips - dba-oracle.com How To Setup Dataguard Broker Configuration (DG Broker) In 19c Although the default value of 30 seconds is typically adequate for detecting outages and failures on most configurations, you can adjust failover sensitivity with this property to decrease the probability of false failovers in a temporarily unstable environment. is only possible when the configured data loss guarantee can be Stopping a Specific Observer When There are Multiple Observers. Oracle 12c-Step by Step Manual Data Guard Failover. FAN server-side callouts can be configured on the database tier. You can also specify a list of ORA- errors that will initiate FSFO failover. 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. environment variable is set and the specified directory has the Switchover Steps. The PeopleSoft application servers will react accordingly to FAN events The string "NONAME" cannot be used as an observer name. We will create 4 SRLs starting with group# 11. Another consequence of immediate failover is that all other databases in the configuration are disabled and must be reinstated or re-created before they can serve as standby databases for the new primary database. Then set the configuration protection mode to maximum availability. Determine the number and size of the Online Redo Log files (ORLs). 2. all of the same type (all physical or all logical standby databases), choose the standby return until you issue the STOP OBSERVER command Before enabling fast-start failover, use one of the following techniques Setup a high availability design for Oracle Data Guard (Fast-Start The RedoRoutes property on the primary if the new value would result in the primary not being able to ship redo to the current fast-start failover target standby. Dataguard broker is used to automate monitoring and controlling standby setups. Observer sites monitor the fast-start failover environment. On Windows, the directory specified by the DG_ADMIN On primary database NORTH, execute the following: On standby database SOUTH, execute the following: Services that are to be active while the database is in the physical standby role must also be created and started on the current primary database regardless of whether the service will be started on that database or not. command is submitted successfully, the command-line prompt on the If there is more than one standby database in the configuration, you must explicitly set the FastStartFailoverTarget property on the primary database to name one or more candidate target standby databases. value of the FastStartFailoverThreshold property. The master observer uses the value specified by either the DGConnectIdentifier or ObserverConnectIdentifier database properties to connect to the primary and fast-start failover target standby databases. Enabling fast-start failover and starting an observer process involves the following tasks. multiple, inexpensive servers is the basis for the failover and other fault-tolerance features that RAC provides. This action may result in two databases in the configuration simultaneously assuming the primary database role should fast-start failover occur. Otherwise, the DUPLICATE TARGET DATABASE command will fail with "RMAN-20208: UNTIL CHANGE is before RESETLOGS change". In maximum protection mode, an automatic failover is always possible because the Please contact us at contactus@smarttechways.com. The former primary database is disabled. 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. property. 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. file also declares broker configurations and defines configuration When fast-start failover is disabled, no observer is called the master observer; all observers have the same functionality. 99 Software Similar To Oracle Data Guard Backup & Sync Using Cloud Control, you can view the value of the ApplyLag column for each standby database in the Standby Databases section of the Oracle Data Guard Overview page. ASYNC. For each broker configuration on which one or more Archiver is unable to archive a redo log because the device is full or unavailable. What is true about Data Guard setup with fast-start failover? Reinstate the former primary database as a new standby database. This results in the observer establishing a new connection to the primary database every 30 seconds. 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). Perform SWITCH LOGFILE if necessary. Oracle Real Application Clusters Administration and Deployment Guide for more information about configuring FAN, FCF, and ONS on an Oracle Real Application Clusters (Oracle RAC) database. db_domain . The v$database view has has columns specifically for monitoring FSFO status. Opens the new primary database in read/write mode. File. The original primary database can now be configured as a standby. MASTEROBSERVERHOSTS, DGMGRL reports an error if the status before the crash. See Performing Manual Role Changes When Fast-Start Failover Is Enabled for more information. have received all the redo data the primary has generated in order for automatic failover to 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. Manual failover gives you control over exactly when a failover occurs and to which target standby database. To verify the readiness of the fast-start failover configuration, issue the DGMGRL SHOW CONFIGURATION VERBOSE command or the SHOW FAST_START FAILOVER command on the primary database. If client-side ONS configuration is used, the client-side ONS configuration file must specify the hostname and port of the ONS daemon(s) of the primary database and each standby database. The FastStartFailoverThreshold time interval starts when the observer first detects there might be a failure with the primary database. When restarting the databases, you may restart them in any order. Oracle also provides Fast Application Notification (FAN) for OCI clients and Fast Connect Failover for JDBC clients. Therefore, the primary database can continue processing transactions, even if the target standby database fails. The examples shown in this section do not necessarily show the specific attributes you might need to use in your own environment. 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. Use the EMCLI verb dg_configure_observers. may allow the primary database to continue redo generation after It is possible to manually perform a completer failover to a standby database that receives redo data from a far sync instance. Data Guard Configuration Details:-. The example assumes that the standby uses the same directory structure as the primary. present, you must start the observer manually using the following Notice that the former primary is now disabled. environment variable to specify the default location for client-side broker files. 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. ERROR: Unable to verify the graphical display setup. Flashback Database is a continuous data protection (CDP) solution integrated with the Oracle Database. failover to the target standby database. On the Oracle Data Guard Overview page next to the Fast-Start Failover status field, click Disabled to invoke the Fast-Start Failover page. Immediately after issuing command in step 2, shut down and restart the standby instance STAN: 1. The broker allows a complete failover to proceed as long as there are no errors present on the standby database that you selected to participate in the failover. The default value is ALL. 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. Use the SQL ALTER DATABASE MOVE DATAFILE command to rename or relocate an online data file on a physical standby that is a fast-start failover target if the standby is mounted, but not open. The target standby database has contact with the primary database. These scripts must be in the same directory as the drain_timeout amongst the active services. ORACLE instance shut down. client-side broker files, the specified values are used. Configure one or more active standby databases Minimize downtime for upgrades times that the observer retries a failed ping before it initiates a All Data Guard environments require the use of a password file in order to allow the databases to connect to each other. Broker will verify that the configuration meets all prerequisites before enabling FSFO and will report any problems it finds. Relationship Between Primary, Target Standby, and Observer During Fast-start Failover. Flashback Database stores its logs in the Flash Recovery Area (FRA), so the FRA must be large enough to store at least 60 minutes of Flashback Database history. This list describes how the overall Oracle Data Guard protection mode is handled after a manual failover (complete or immediate). They must be re-created from a copy of the new primary database. *PATCH v5 0/6] Add Toshiba Visconti Video Input Interface driver @ 2023-01-11 2:24 Yuji Ishikawa 2023-01-11 2:24 ` [PATCH v5 1/6] dt-bindings: media: platform: visconti: Add Toshiba Visconti Video Input Interface bindings Yuji Ishikawa ` (5 more replies) 0 siblings, 6 replies; 42+ messages in thread From: Yuji Ishikawa @ 2023-01-11 . Performing a Manual Failover Task 1: Determine Which of the Available Standby Databases is the Best Target for the Failover, Performing a Manual Failover Task 2: Start the Failover, Performing a Manual Failover Task 3: Reset the Protection Mode, Performing a Manual Failover Task 4: Re-establish a Disaster-Recovery Configuration. The following sections describe how to perform manual failovers: Reenabling Disabled Databases After a Role Change. How to Enable Fast-Start Failover in Oracle Data Guard FastStartFailoverLagLimit configuration property. 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. Reinstatement is supported only after failover in a broker configuration. Stopping the Observer When There is Only One Observer. To see Manual Switch Over Manual SwitchOver in Oracle To see Manual Fail Over Manual Failover in Data Guard With Oracle Data Guard [] We could not find a match for your search. This can be done regardless of whether the failover was done to a physical, logical, or snapshot standby database. Bounce your database and verify database name its open mode and its role: SQL> shutdown immediate; ORA-01109: database not open Database dismounted. In maximum performance mode, the ability to automatically failover is restored name of the observer log file is That is, if the observer is connected to any instance in the Oracle RAC, all instances will show a value of YES. This article - the seventh in this ongoing . using the same SYS credentials you used when you connected to the directory. Implement Oracle Data Guard on an Azure Linux virtual machine pre-callout configuration script and post-callout configuration script. 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.