This feature enables RMAN to duplicate an existing database over the network without requiring a backup to disk or tape. Although redo transfer is synchronous, Maximum Availability mode allows the primary to remain available if the standby database becomes unavailable for any reason (e.g. Figure 6-1 shows the relationships between the primary database, target standby database, and observer during fast-start failover: Before Fast-Start Failover: Oracle Data Guard is operating in a steady state, with the primary database transmitting redo data to the target standby database and the observer monitoring the state of the entire configuration. 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. For more information, see START OBSERVER IN BACKGROUND. cannot use a different name for this file. Note: if the observer loses contact with the primary, but the standby does not, the observer can determine that the primary is still up via the standby. Use the oraenv script provided by Oracle. Note that these properties only affect whether primary shutdown and automatic reinstatement are performed if a fast-start failover occurs because the primary crashed or was isolated from the observer and target standby database. This guide uses the naming convention of appending an underscore followed by a letter to the db_name to create the db_unique_name. To start an observer, you must be able to log in to DGMGRL with an account that has Figure 6-2 The Observer in the Fast-Start Failover Environment. Broker will set the primary to use asynchronous log transport by default. Oracle Database 11g FSFO adds support for Maximum Performance mode (async redo transfer), providing the flexibility to trade durability for performance. The physical and snapshot standby databases will have to be re-created from a copy of the new primary database. the service configuration. Setting this property to 'TRUE' (the default) causes the primary to self-terminate. Then, on the Fast-Start Failover Change Mode page, click Enabled. After fast-start failover is enabled and up to four observers are started, one observer is nominated as the master observer that continuously monitors the environment to ensure the primary database is available. Change Standby to Primary Database. If the WAIT option is included in the (For example, if the DBMS_LOGSTDBY.SKIP procedure was used to specify which database operations done on the primary database will not be applied to the logical standby database.). ensure that it has the required permissions. 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. multiple, inexpensive servers is the basis for the failover and other fault-tolerance features that RAC provides. However the target can receive redo from a far sync instance.). the observer on ob2-host to become the master In this case, Flashback Database cannot be used to reinstate databases. 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. present, you must start the observer manually using the following fsfo_hostname.dat. This allows for redundancy in your Data Guard observer setup as well. For Oracle Database Release 12.2 and higher, Oracle Enterprise Manager Cloud Control (Cloud Control) supports configuring multiple observers using the Enterprise Manager Command Line Interface (EM CLI). It is possible to manually perform a completer failover to a standby database that receives redo data from a far sync instance. The configuration and database status report the same error messages as are returned when there is only one registered observer. Multiplexing SRLs merely adds unnecessary IO and can increase commit latency. 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. If both of those observers are unavailable, the observers If you expect the network to be disconnected for a long time and Many customers use Oracle Database deployed on Amazon Elastic Compute Cloud (Amazon EC2) to run their Oracle E-Business Suite applications. The observer is very lightweight, requiring few system resources. 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 primary database was shut down without using the ABORT option. SWITCHOVER command, and the databases are managed by Oracle Other members of the configuration will receive redo from the designated redo source based on the new primary. observer, whether it is currently connected to the primary and target standby databases, Oracle Data Guard Command-Line Interface Reference for more information about these broker commands. 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 Oracle Database 10g FSFO observer is limited to using the default username and password defined in the wallet. The default value is 30 seconds and the lowest possible value is 5 seconds. Each database in a Data Guard configuration must have a unique name. If these parameters are modified outside of Broker, it raises a warning. Enable Fast-Start Failover Using Cloud Control. Create a pre-callout script, or a post-callout script, or both. Use the VALIDATE STATIC CONNECT IDENTIFIER command to ensure the static services have been configured correctly. A trigger on the DB_ROLE_CHANGE system event can be used to update the naming service and, with the proper client cache TTL settings, clients can connect to the new primary very quickly. This document only talks about switchover involving physical standby database. Es gratis registrarse y presentar tus propuestas laborales. Use the EMCLI verb dg_configure_observers. It uses the connect identifier specified in the observer configuration file to locate the credentials for a broker configuration from the Oracle wallet. configuration. Nothing will ruin your day faster than finding out that the standby the observer just failed over to is 12 hours behind in applying redo. database. Upon detecting the break in communication, the observer attempts to reestablish a connection with the primary database for the amount of time defined by the FastStartFailoverThreshold property before initiating a fast-start failover. Oracle also provides Fast Application Notification (FAN) for OCI clients and Fast Connect Failover for JDBC clients. (It is permissible to change the RedoRoutes property on all standby databases including target standby databases. 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. If the protection mode was at maximum protection, it is reset to maximum performance. If you performed a failover or switchover that requires you to re-create the failed primary database or standby databases that were disabled during the role transition, then follow the procedures in the Oracle Data Guard Concepts and Administration chapter, "Creating a Physical Standby Database" and also the Oracle Data Guard Concepts and Administration chapter, "Creating a Logical Standby Database.". Oracle Corporation recommends that you specify this type of failover. All database connections associated with the observer, including the initial connection, must use dedicated server connections. By default the file is named fsfo.dat and is created in the working directory where the observer is started. See Manual Failover for information about manual failover. A normal shutdown uses SHUTDOWN NORMAL, SHUTDOWN IMMEDIATE, or SHUTDOWN TRANSACTIONAL. fsfo_postcallout are stored in the same location as file also declares broker configurations and defines configuration How to Implement Fast-Start Failover 11g - Ed Chen Logic If no value is specified for the When the configuration has more than one registered observer, if the primary and target standby databases stay connected but the connection to the master observer is lost, then the broker tries to nominate a backup observer as the new master observer. In the following example, a service named sales is configured to be active in the PHYSICAL_STANDBY role on the primary database NORTH. On the Oracle Data Guard Overview page next to the Fast-Start Failover status field, click Disabled to invoke the Fast-Start Failover page. configuration file, such as START OBSERVING, Which three are prerequisites for enabling fast-start failover This is a good time to enable FSFO to make sure that all of the prerequisites have been met. For information about event notification and database connection failover support for global services, see the Oracle Database Global Data Services Concepts and Administration Guide. The Oracle Database 11g observer can make use of specific credentials, allowing the same wallet to be used for multiple observers with different SYS passwords. This file contains connect identifiers to both the primary and the target standby databases. Immediate Failovers in Configurations Using Far Sync Instances. Create a unique connect alias for each database. The original primary database will be restarted as a part of the switchover operation. crash, data in this file can be used to restart the observer to the The master observer waits the number of seconds specified by the FastStartFailoverThreshold configuration property before attempting a fast-start failover when the primary database has crashed or has lost connectivity with the observer, as in the following situations: The primary database loses its connections with both the observer and target standby database. This Oracle Data Guard Concepts and Administration provides information about setting up the databases in preparation of a switchover. Only the observer can initiate FSFO failover. File. The minimum If automatic reinstatement fails, the broker will log errors and the former primary database will remain in the mounted state. If the database is not managed by Oracle Clusterware, To do this, use the SET ObserverConfigFile and SHOW ObserverConfigFile commands. Note that if the V$DATABASE.FS_FAILOVER_STATUS column has a value of DISABLED, then any values returned for the remaining columns related to fast-start failover (V$DATABASE.FS_FAILOVER_*) become irrelevant. Once the Oracle instance is transitioned into primary database status in either switchover or failover, the life of the database as the standby ends and its service as the primary database . If clients are already configured to automatically time out and reconnect if they don't get a response from the database, a simple but effective approach is to use a network alias (e.g. This section describes how to stay on top of your FSFO environments. When a switchover is started, the primary and standby databases that are involved should have as small a redo lag as possible. The information in this guide is based on practical experience gained from deploying FSFO in a global corporate production environment. Step:1 Check the database role and open_mode The guide makes few assumptions about your existing environment and includes examples for creating a physical standby database and Data Guard Broker configuration. operation: Example 6-1 Fast-start Failover Configuration This property also affects whether the broker skips viability checks of bystander standby databases when a fast-start failover occurs. You can start the observer before or after you enable 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. You have done a failover to your Standby database so it becomes the new Primary. Run the RMAN utility and connect to the target (primary) and auxiliary (new standby). Manual failover gives you control over exactly when a failover occurs and to which target standby database. A manual failover is already in progress. If this operation is successful, a zero data loss failover may be possible even if the primary database is not in a zero data loss protection mode. If the standby database is not enabled for management by the broker, then the failover cannot occur. FastStartFailoverLagLimit property. Any standby database that was disabled by the broker must be reinstated or re-created, as described in Reenabling Disabled Databases After a Role Change, before it can be a standby database for the new primary database. After an immediate failover completes, all the standby databases in the configuration, regardless of their type, are disabled. Prepare the primary database in advance for its possible future role as a standby database in the context of the overall protection mode (see Managing Data Protection Modes). data (in seconds) specified by the Complete Failovers in Configurations Using Far Sync Instances. Note: If you have just enabled archivelog mode, force an archive log creation ( alter system archive log current) to ensure that at least one archive log exists. To issue commands and interact with the PeopleSoft can be configured for Active Data Guard. 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. 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. In Oracle Database 11g, the password file on the standby must be a physical copy of the password file on the primary due to security enhancements introduced in Oracle Database 11g. fsfocallout.ora. It's generally a good idea to store the state file in a directory associated with the database to avoid locking issues when running multiple observers on the same host. You may failover to a snapshot standby database. By default, the observer creates this file in the current working directory when it is started and names the file fsfo.dat. 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. This file Dataguard PDB level failover support for Multitenant Oracle 19c Dataguard Configuration details:- Login in to Standby Server:- Step:1 Check the database role and open_mode Select name,open_mode,database_role from v$database; Step:2 Cancel the MRP process alter database recover managed standby database cancel; Step:3 The below commands will help to bring up standby as primary The following is a sample observer configuration file: Since the broker configuration SALES consists of three databases, Boston, Chicago, and Dallas, with a CONNECT_ID of SALES_P, the SALES_P connect identifier must be defined such that it can reach any instance of any database within the configuration. Create a trigger on this event to perform actions specific to your environment after a switchover or failover, such as updating the name resolution service to point to the new primary. The targets are referred to as candidate targets. See Troubleshooting Problems During a Switchover Operation for more information. Initiate the failover on the standby database STAN: For example: You can find information about the master observer by querying the V$DATABASE view. A single-instance database must be registered with Oracle Restart in order to publish FAN events via ONS. Reinstatement will have to be accomplished by other means (manual or scripted Broker commands). You must manually re-create the database as a standby database and then reenable it. The FastStartFailoverLagLimit configuration property is only used by the broker when enabling fast-start failover for configurations operating in maximum performance mode. SET MASTEROBSERVER TO allows you to manually change the observer configuration file. Your email address will not be published. The NetTimeout property specifies the number of seconds LGWR will block waiting for acknowledgment from the standby in synchronous mode before considering the connection lost (corresponds to the NET_TIMEOUT option of log_archive_dest_n). How to reinstate the old Primary as a Standby after Failover in #Oracle If the database is managed by Oracle Clusterware, broker does not open any pluggable Restarts the new standby (former primary) database if the switchover occurs to a physical standby database, and Redo Apply begins applying redo data from the new primary database. 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. observer is still in contact with the standby. Displays only on the target standby database when either the primary or target standby database was shut down in a controlled fashion (using the NORMAL, IMMEDIATE, or TRANSACTIONAL, options, but not the ABORT option). The service is then configured to be active in the PRIMARY role on the standby database SOUTH, so that it will be active on that database after a role transition. Enabling Fast-Start Failover Task 1: Determine Which of the Available Standby Databases is the Best Target for the Failover, Enabling Fast-Start Failover Task 2: Specify Target Standbys with the FastStartFailoverTarget Configuration Property, Enabling Fast-Start Failover Task 3: Determine the Protection Mode You Want, Enabling Fast-Start Failover Task 4: Set the FastStartFailoverThreshold Configuration Property, Enabling Fast-Start Failover Task 5: Set Other Properties Related to Fast-Start Failover (Optional), Enabling Fast-Start Failover Task 6: Enable Additional Fast-Start Failover Conditions (Optional), Enabling Fast-Start Failover Task 7: Using DGMGRL or Cloud Control, Enabling Fast-Start Failover Task 8: Start the Observer, Enabling Fast-Start Failover Task 9: Verify the Fast-Start Failover Environment. A fast-start failover occurred because a user-configurable condition was detected or was requested by an application by calling the DBMS_DG.INITIATE_FS_FAILOVER function. Data Guard switchover with dgmgrl - dba-oracle.com These clients can be configured for Fast Connection Failover (FCF) to automatically connect to a new primary database after a failover. broker does not allow the primary database to commit transactions until it has regained Learn how your comment data is processed. isolated. Depending on the failover and the types of standby databases involved, some of the databases may need to be reinstated or re-created. Otherwise, the DUPLICATE TARGET DATABASE command will fail with "RMAN-20208: UNTIL CHANGE is before RESETLOGS change". Oracle FAN with Oracle Data Guard but without using Oracle Grid/ RAC Make sure the last redo data transmitted from the Primary database was applied on the standby database. For example: The default value for the FastStartFailoverThreshold property is 30 seconds and the lowest possible value is 6 seconds. The column value for V$DATABASE.FS_FAILOVER_STATUS will be SYNCHRONIZED in a configuration operating in maximum availability mode, and it will be TARGET UNDER LAG LIMIT in a configuration operating in maximum performance mode when ready to fast-start failover. However, there may be situations in which you must disable fast-start failover when After step 3 completes, you can open the new Primary database STAN: We suggest you try the following to help find what youre looking for: This document will guide you through configuringOracle Data GuardFast-Start Failover (FSFO) using a physical standby database. After the failover completes, the former primary database is automatically reinstated as a standby database when a connection to it is reestablished, if the FastStartFailoverAutoReinstate configuration property is set to TRUE. For switchovers, understanding all of the factors can simplify the choice of which standby database to consider as your new primary database. Verify the target standby database is ready for failover. Aug 2022 - Present6 months. operation can be automated using callout scripts. If the observer finds that the database is no longer the primary, it will attempt to reinstate it as the failover target standby. The target standby database is synchronized with the primary database if it is a configuration operating in maximum availability or maximum protection mode, or the target standby database is within the lag limit if it is a configuration operating in maximum performance mode. You can find detailed information about all observers, including master observers and backup observers, in the V$FS_FAILOVER_OBSERVERS view. Add the primary database and each standby database to the address list. This walkthrough uses Maximum Availability mode to achieve "zero data loss". Flashback Database is a continuous data protection (CDP) solution integrated with the Oracle Database. If you re-create the old primary database, it must be created as the standby type of the old standby database. If the failover target database is an Oracle RAC physical or snapshot standby database, the broker directs Oracle Clusterware to restart all instances that may have been shut down prior to the failover. In a separate terminal session, verify the configuration. Testing FSFO failover requires simulating loss of the primary. By default, the broker always determines whether bystander standby databases will be viable standby databases for the new primary when performing a complete failover. VALIDATE [PATCH v5 0/6] Add Toshiba Visconti Video Input Interface driver Instead, when broker notifies the Oracle Note: You can also use TNS aliases defined in the tnsnames.ora file when setting the local_listener parameter. environment that is guaranteed to either lose no data (when the See Setting the Protection Mode for Your Configuration. The default group is all the configurations defined in the observer configuration file. The default Database dismounted. You can use the maximum protection, maximum availability, or maximum The FastStartFailoverThreshold time interval starts when the observer first detects there might be a failure with the primary database. This property cannot be used to prevent the primary database from shutting down if a fast-start failover occurred because a user configuration condition was detected or was requested by an application by calling the DBMS_DG.INITIATE_FS_FAILOVER function. variable must have read, write, and execute permissions for the directory owner In an Oracle Data Guard configuration, the SRVCTL -startoption for a standby database is always set to OPEN after a switchover. required permissions, DGMGRL reports an error. The new primary database is opened in read/write mode and redo transport services are started. If any errors occur during either conversion, the broker stops the switchover. Displays when the primary and target standby databases are synchronized and the configuration is operating in maximum availability mode. The FS_FAILOVER_STATUS column in the V$DATABASE view for the target standby database displays a reason why fast-start failover cannot occur. Guide to Oracle Data Guard Fast-Start Failover The general approach seems to be CDB level failover to standby , so the failover takes place at CDB to CDB , in an event where a single PDB is experiencing an issue , we will have to failover the whole instance ..this will impact all PDB's on the CDB. Note that the value of the FastStartFailoverPmyShutdown configuration property must be FALSE for the primary to stall indefinitely under these conditions. Once the primary database regains connectivity with the target standby database, fast-start failover will be disabled for all the databases in the configuration. client-side broker files, the specified values are used. After the database has been re-created, enable broker management of the re-created standby database by using the DGMGRL ENABLE DATABASE command.
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