Use the 'show fast_start failover' command to see which user configurable FSFO failover conditions are in effect. fsfo_hostname.dat. Create a unique connect alias for each database. (Note: 11.1.0.7 adds the StaticConnectIdentifier Broker database property to allow you to specify a different service name.) have received all the redo data the primary has generated in order for automatic failover to To specify which observer can be a master observer when a database is in if the observer is not running, The master observer and the target standby database are inconsistent with regard to the current state of the broker configuration, If the protection mode is maximum availability or maximum protection and the target standby database was not synchronized with the primary database at the time the primary database failed, If the protection mode is maximum performance and the apply point of the target standby database lags the redo generation point of the primary database by more than the amount specified by the FastStartFailoverLagLimit configuration property at the time the primary database failed. maximum availability and maximum performance modes, to avoid a The minimum allowable limit is 10 seconds. To start a switchover using Cloud Control, select the standby database that you want to change to the primary role and click Switchover. It shuts down or stalls because it is likely a failover has occurred. 2) Switchover/Failover option is disabled on Enterprise Manager.What are the steps to enable it so that I can do Switchover/Failover operation using OEM. To start an observer, you must be able to log in to DGMGRL with an account that has Using Shared Server (MTS) or connection pooling can result in unpredictable behavior. observer name, host, whether it is the master observer, when it became the master computer, it automatically starts the observer when you enable See Performing Manual Role Changes When Fast-Start Failover Is Enabled for more information. the primary database that failed or took longer than the time For example, perform full level 0 backups weekly and incremental level 1 backups daily. Only the observer can initiate FSFO failover. property. Waits for the target standby database to finish applying any unapplied redo data before stopping Redo Apply (if the target is a physical standby database) or SQL Apply (if the target is a logical standby database). What is true about data guard set up with fast-start failover (FSFO) in Oracle Cloud Infrastructure (OCI)? If necessary, you can shut down the primary or target standby database in a fast-start failover environment. In order to maintain separation of Broker and non-Broker activity, a second static service is recommended. *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 . 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 price for this guarantee is increased commit latency ( log file sync waits). If failover occurs to a logical standby database, all physical and snapshot standby databases will be disabled by the broker. If that metadata is pushed out, Oracle can no longer find a fuzzy snapshot so it will not be able to flash back. The database cannot provide fast-start failover status information. Steps for Data guard Switch-over and Switchback in Oracle - Doyensys 1. Standby databases that are disabled during switchover, manual failover, or fast-start failover will not be automatically reinstated. The broker controls the rest of the switchover. 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. STOP OBSERVING, and SET Connect-Time Failover to Standby Database - Ed Chen Logic We can always fail over to it or have it happen automatically if for some reason the primary Managed Instance has [] This table describes the optional database properties that you can set. Specifying Preferred Observers Based on Current Primary. The v$database view has has columns specifically for monitoring FSFO status. The values that indicate FSFO is ready for failover are listed below. Writing the wrapper itself and the means to determine when to execute it are up to you. The primary database, it attempts to disable fast-start failover on as many databases in the configuration with which it has a network connection. To install Oracle Data Guard, you need to create two Azure VMs on the same availability set: The primary VM (myVM1) has a running Oracle instance. The targets are referred to as candidate targets. FAN server-side callouts can be configured on the database tier. lower detection times for primary database failures, you must It may be possible to convert the old Primary into a Standby database now instead of having to do a time consuming duplicate again. Switchover to a logical standby database is disallowed when the configuration is operating in maximum protection mode. Displays the current fast-start failover mode. Open another prompt and connect to SQLPLUS: Broker changes database parameters during startup and role transitions via ALTER SYSTEM commands. If you have an Oracle RAC primary database, consider specifying a higher value to minimize the possibility of a false failover in the event of an instance failure. You can also reinstate bystander standby databases that were disabled during a failover operation. You can switch over or manual failover to a bystander database. All physical and snapshot standby databases will be disabled and must be re-created from a copy of the new primary database after a switchover to a logical standby database. Oracle Data Guard Manual Failover - ORACLEAGENT BLOG There can be up to four observers for a single Data Guard configuration. The minimum the names of the scripts created in the previous step. 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. 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. the observer was killed after the stall began, but before the failover timeout had elapsed). 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). lose no more than the amount of data (in seconds) specified by the In this case, the FS_FAILOVER_STATUS and FS_FAILOVER_OBSERVER_PRESENT columns will appear as shown in the following table and fast-start failover will not occur: Oracle Database Reference for more information about the V$DATABASE view. REINSTATE REQUIRED is present only after fast-start failover has occurred and shows on both the new primary database and the database undergoing reinstatement. callout configuration scripts fsfo_precallout and See Enabling Fast-Start Failover for more information. The 2. ZERO DATA LOSS: Fast-start failover is enabled with zero data loss. An observer is an OCI A normal shutdown prevents a fast-start failover until the primary database and standby database are connected and communicating again. Starting the Observer Using Cloud Control. If you expect the network to be disconnected for a long time and failover configuration file, this script is run. See the Cloud Control online help for more information. Click Failover. Regards, Narottam Tagged: dataguard dba rac Welcome! callout directory. There are prerequisites that must be met before the broker allows you to enable fast-start failover. observer, whether it is currently connected to the primary and target standby databases, The broker disables all of the physical and snapshot standby databases in the configuration. The ObserverOverride and ObserverReconnect properties allow you additional control over the connection to the primary. Displays only on the target standby database when it is SYNCHRONIZED with or is TARGET UNDER LAG LIMIT of the primary database, has connectivity to the observer, but the primary database does not have a connection to the observer. variable must have read, write, and execute permissions for the directory owner If the standby database is not enabled for management by the broker, then the failover cannot occur. primary, only the observers specified in the property can be use in the SET primary. Data Guard. Issue the following commands on Primary database and Standby database to find out: Commands For Managing Observers on Multiple Configurations. The ObserverPingInterval If there is only one observer, then it is considered to be the master observer. The default value is 30 seconds and the lowest possible value is 5 seconds. 3. For zero data loss in maximum availability mode, the FastStartFailoverLagLimit property must be set to zero. Performing failover : Step 1: Check Standby Database role. To verify the observer is started and the configuration is ready for Learn how your comment data is processed. To stop it, you can do either of the following: Choose the Stop Observer option on the first page of the fast-start failover wizard and click Continue at the bottom of the page. This file contains connect identifiers to both the primary and the target standby databases. Your email address will not be published. A database in the primary role will not open until it has verified with the observer that it is still the primary. If you intend to switch back to the original primary database relatively soon, you may allow the physical and snapshot standbys to remain disabled. If groups are not defined, you can still operate on all configurations defined in the file as a whole. Note that if failover was performed on a snapshot standby database, the old primary must be either reinstated or re-created as a physical standby database. Fast-start failover allows the broker to automatically fail over to a previously chosen standby database in the event of loss of the primary database. 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. Set both these properties to achieve a primary failure detection time of 1 Reinstating the Former Primary Database in the Broker Configuration for more information about reinstatement. Duplicate configuration names in configuration definitions are not allowed. It comes with a GUI and command line interface. Oracle Data Guard configuration with DGMGRL. value of the FastStartFailoverThreshold property. See the Oracle Reference and Data Guard Administrator guides for your release for details. Goal. The following is an example of querying the V$FS_FAILOVER_STATS view: Disabling fast-start failover prevents the observer from initiating a failover to the target standby database. specified, the file is stored in an appropriate directory under the broker's Oracle Data Guard Concepts and Administration provides information about setting up the databases in preparation of a switchover. You can issue a Connect to the target standby database and issue the FAILOVER command to perform a failover, specifying the name of the standby database that you want to become the primary database: Specify the optional IMMEDIATE clause to perform an immediate failover if any of the following conditions are true: An ORA-752 error has occurred at the standby database, An ORA-600 [3020] error has occurred at the standby database and Oracle support has determined that it was caused by a lost write at the primary database. If you don't already have a Flash Recovery Area (FRA), you will need to create one for Flashback Database. Another good test is to simulate network failures that leave the primary up, but isolated from the failover target standby and the observer. This allows Data Guard to remain functional during maintenance periods when the application listeners are down. What is true about data guard set up with fast-start failover (FSFO) in Oracle Cloud Infrastructure (OCI)? Databases that have been disabled after a role transition are not removed from the broker configuration, but they are no longer managed by the broker. It provides a way to quickly restore a database to a previous point in time or SCN using on-disk data structures called flashback logs.
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