Start the Data Guard listener on both "a" and "b" hosts. 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. The following sections provide information about managing observers: How the Observer Maintains Fast-Start Failover Configuration Information, Patching an Environment When the Observer Is Running and Fast-start Failover Is Enabled. value of the FastStartFailoverThreshold property. directory. The "Configuring Authentication" chapter of the Oracle Database Security Guide provides detailed instructions for creating a wallet. Steps for FAILOVER the Dataguard environment Ensure this file cannot be read by unauthorized users. SHOW OBSERVER command to confirm that the switch took place. irrespective of its content, indicates that the script executed successfully. SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE FINISH; Reinstating the Former Primary Database in the Broker Configuration for more information about reinstatement. SUSPENDED is cleared when connectivity with the primary database is restored. The service can be started on the physical standby only after the redo generated by starting the service has been applied. 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. 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. the observer configuration file is observer.ora. This can be done regardless of whether the failover was done to a physical, logical, or snapshot standby database. 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. This can be avoided by first disabling fast-start failover with the FORCE option on the target standby. This can be avoided by first disabling fast-start failover with the FORCE option on the target standby. FastStartFailoverLagLimit By default, the observer will initiate failover to the target standby if and only if ALL of the following are true: Oracle Database 11g Rel 1 introduced user configurable failover conditions that can trigger the observer to initiate failover immediately. Be aware that if you issue the following manual commands on either of those databases, then both the SALESRO and SALESRW services would be started on the databases regardless of what you may have earlier specified with the SRVCTL -role qualifier. For each broker configuration on which one or more The role change is directed to the same standby database that was specified for the FastStartFailoverTarget database property on the primary database. Note: Data Guard requires dedicated server connections for proper operation. This is to ensure that the service definition gets propagated to the physical standby database via the redo stream and thus allows for the service to be started on the physical 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. When performing a failover in a configuration whose standbys are all of the same type, choose the standby database that has the smallest transport lag. In this mode, the FastStartFailoverLagLimit configuration property is set to zero. ZERO DATA LOSS: Fast-start failover is enabled with zero data loss. primary. If the alter database set standby database to maximize availability; If you don't already have a standby database, use your favorite method to create one. Only the observer can initiate FSFO failover. To prevent automatic reinstatement of the former primary database in these cases, set this configuration property to FALSE. If the failover fails for any reason, it could leave the target standby database inoperable, regardless of whether the target standby database is ready to failover. Errors occurring for any other configuration members will not impede the switchover. Monitoring flashback database history and reacting when it drops below 30 minutes will save you time and improve availability. second. Transitions the target standby database into the primary database role, as follows: Changes the role of the database from standby to primary. Once you have completed the switchover back to the original primary, you may then reenable the physical and snapshot standby databases since they are still viable standbys for the original primary database. All database connections associated with the observer, including the initial connection, must use dedicated server connections. return until you issue the STOP OBSERVER command This list describes how the overall Oracle Data Guard protection mode is handled after a manual failover (complete or immediate). The remaining Data Guard-related parameters will be set by Broker later in the walkthrough. On the Oracle Data Guard Overview page in Cloud Control, select the standby database that you want to change to the primary role and click Failover. 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. If an application has called this function and it has received a status of SUCCESS, then the master observer attempts a fast-start failover. Configure the TNSNAMES.ORA file on the observer system so that the observer is able to connect to the primary database and to the pre-selected target standby database. While Oracle 11g's Data Guard definitely protects a database when the entire production site is lost via its failover capabilities, it's still necessary for an Oracle DBA to intervene to complete the failover process. MASTEROBSERHOST TO command. the current working directory. You must manually re-create the database as a standby database and then reenable it. Disabling fast-start failover with the FORCE option when connected to the target standby database guarantees that fast-start failover will not occur. To determine if the configuration is ready for fast-start failover to occur, issue the DGMGRL SHOW DATABASE command, or query the V$DATABASE view on either the primary or target standby databases. Broker stores it configuration information in a mirrored set of files outside the database. 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. We want the observer to be able to automatically reinstate the former primary as a standby after our failover tests, so before each test, make sure that Flashback Database has at least 30 minutes of history. Oracle Data Guard helps you change the role of databases between primary and standby using either a switchover or failover operation. For example: Using DGMGRL, you can do this by examining the output of the SHOW CONFIGURATION LAG. Set the ObserverPingInterval and Displays the current fast-start failover mode. This is particularly useful when registering with multiple listeners where the parameter value would otherwise exceed the 255 character limit. OBSERVER command, if this directory does not have the For example, if a physical standby database was in the APPLY-OFF state, it will remain in the APPLY-OFF state. only. ), The RedoRoutes property on a far sync instance if it is being used to receive redo from the primary database and ship redo to the target standby database, The standby database that is the target of fast-start failover, A far sync instance if it is being used to receive redo from the primary database and ship redo to the target standby database, Unless the conditions listed in Performing Manual Role Changes When Fast-Start Failover Is Enabled have been met, To a standby database that is not configured as the fast-start failover target. Then, click Continue to proceed to the next page. After FSFO is enabled, Broker will continue to check that Flashback Database is enabled during health checks. A far-sync instance cannot be used in maximum protection mode. Its primary job is to perform a failover when conditions permit it to do so without violating the data durability constraints set by the DBA. database is in the primary role. The broker first converts the original primary database to run in the standby role. If both HVR and Data Guard were running without latency or if no changes were made to the source database at the time of the failover, it can be assumed that all databases are synced and the no extra steps are necessary; the steps for Graceful Failover can be followed. 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. *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 . under the $DG_ADMIN directory. expires. A complete failover also attempts to avoid disabling any standby databases that were not the target of the failover, so that they may continue serving as standby databases to the new primary database. 3. It uses these databases as a copy of the . 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. Apply services on all other bystander standby databases automatically begin applying redo data received from the new primary database. The broker verifies the state and status of the databases to ensure that the switchover transitioned the databases to their new role correctly. However the target can receive redo from a far sync instance.). Archiver is unable to archive a redo log because the device is full or unavailable. 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. PRIM>STARTUP MOUNT; 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. 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). Regards, Narottam Tagged: dataguard dba rac Welcome! Change the failover target to the standby being switched over to, Change the failover target to the desired standby. After a complete failover finishes, any bystander standby database that is not viable as a standby for the new primary database will be disabled by the broker. To help you select an appropriate switchover or failover target, use the following DGMGRL commands which perform checks on the database to determine its readiness to complete a role change. A normal shutdown prevents a fast-start failover until the primary database and standby database are connected and communicating again. Restart the database to the mounted state, Use Cloud Control or DGMGRL to reinstate the database. POTENTIAL DATA LOSS: Fast-start failover is enabled with some data loss. In maximum availability mode, the behavior depends on the value of the 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). Application calls to DBMS_DG.INITIATE_FS_FAILOVER. 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. REINSTATE REQUIRED is present only after fast-start failover has occurred and shows on both the new primary database and the database undergoing reinstatement. If you like a connect-time failover to survive across a data guard switchover, you need another way to do it. A manual failover is already in progress. Create or update the fast-start failover callout configuration file and include Oracle Data Guard provides the ability to create and maintain Standby databases at one or more sites These protect Oracle databases from database and server failures as well as site disasters Failover to one of the alternate sites can be set to happen automatically (fast-start failover) or manually if the primary database is not usable Immediate: No additional data is applied on the standby database, resulting in a data-loss . Add an entry to the oratab file for the standby, db1:/u01/app/oracle/product/11.1.0/db_1:Y. If the primary and target standby databases do not have network connectivity or if the database to which you are connected does not have network connectivity with the primary database, consider using DISABLE FAST_START FAILOVER with the FORCE option. Here's a one-liner observer startup for *nix. Additionally, the new master observer is identified in the output shown for the SHOW FAST_START FAILOVER and SHOW OBSERVER commands. After the fast-start failover completes successfully, the master observer will attempt to reinstate the former primary database as a new standby database when a connection to the former primary database is reestablished, and the FastStartFailoverAutoReinstate configuration property is set to TRUE. You will have to reinstate or re-create (see Reenabling Disabled Databases After a Role Change) the standby databases after failover has completed. milliseconds and that of ObserverRetryCount is 10. Whether or not standby databases that were not the target of failover (bystander standby databases) are disabled depends upon how much redo data they have applied relative to the failover target and the standby type of the failover target: If the failover target is a physical or snapshot standby database, the original primary database must be reinstated or re-created in order to be a standby database for the new primary database. They must be re-created before they can serve as standby to the new primary database. Then, on the Fast-Start Failover Change Mode page, click Enabled. In the restore stage, Flashback Database restores the database to a point prior to the standby_became_primary_scn using the before-image blocks in the Flashback Database logs. If you want to capture any logging generated by the observer, use the LOGFILE IS option on the START OBSERVER command, and ensure that the file name is unique. 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. To verify this change, again query the Database_role column of V$DATABASE. See "Database Service Configuration Requirements" for additional information about how the broker interacts with Oracle Restart. you need to make the primary database available, first confirm that a Broker keeps its configuration details in flat file. STAN is now transitioned to the primary database role.Now your PHYSICAL STANDBY Database has become PRIMARY. The group of broker configurations to be managed is declared in the observer configuration file. client-side broker files, the specified values are used. These FAN events can be used in the following ways: Applications can use FAN without programmatic changes if they use one of these Oracle integrated database clients: Oracle Database JDBC, Oracle Database Oracle Call Interface (OCI), Oracle Data Provider for .NET ( ODP.NET), or Universal Connection Pool for Java. This allows for redundancy in your Data Guard observer setup as well. If there are multiple observers, then only one of them is the master observer. Failover automation ensures a seamless transition from the primary database to a synchronized standby database in cases of failure, while ensuring database availability by replaying uncommitted in-flight transactions. These requirements are supplemental to those described in the documents previously referenced and in the following client-specific guides: Oracle Data Provider for .NET Developer's Guide for Microsoft Windows. Prerequisites for Enabling Fast-Start Failover provides complete information about all of the fast-start failover and reinstatement requirements. Once an immediate failover is started, the broker: Verifies that the target standby database is enabled. times that the observer retries a failed ping before it initiates a You can, however, perform a manual failover to a snapshot standby. To protect the files, it's good practice to store them in separate filesystems.

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