Data Guard Failover Options - dba-oracle.com Thus, the validity of the values of these properties is not verified until after the switchover. redo generation on the primary database will be stalled. In this case, no attempt is made to transmit any unsent redo from the far sync instance to the target physical standby prior to converting the physical standby into a primary database. Oracle 11g Manual Data Guard Part-II - DBAtricksWorld.com Add the primary database and each standby database to the address list. In this mode you will need to consider how much data loss is acceptable in terms of seconds and set the FastStartFailoverLagLimit configuration property accordingly. This There are normally two situations when this operation will be performed: a planned outage for maintenance of the primary database or disaster recovery. MASTEROBSERHOST TO command. This brings up the General Properties page that provides a Reinstate button. The default value is 30 seconds. standby database is mounted, broker remembers this setting. automatic failover feature in configurations set up for zero data loss protection at any Fast-Start Failover in Data Guard Environments on Oracle Cloud By default, the observer creates this file in the current working directory when it is started and names the file fsfo.dat. 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. command START OBSERVER IN BACKGROUND. Only the master observer can coordinate fast-start failover with Data Guard broker. The following list indicates the extent to which fast-start failover is disabled in the broker configuration when the DISABLE FAST_START FAILOVER FORCE command is issued on the primary database, target standby database, and a standby database that is not the fast-start failover target. fast-start failover has not occurred to the target standby database. The targets are referred to as candidate targets. You can switch back to the original Primary database later by performing another switch over. When a serious condition uniquely known to an application is detected, the application can call the DBMS_DG.INITIATE_FS_FAILOVER function to initiate an immediate fast-start failover. When both databases have been restarted, you may restart the observer. Once the observer is started, you cannot change the file's name and location. Use the FastStartFailoverTarget configuration property on the current primary database to specify one or more fast-start failover targets. The most common problems are mismatched Data Guard protection modes and LogXptMode properties and forgetting to enable Flashback Database on the primary or standby. A normal shutdown uses SHUTDOWN NORMAL, SHUTDOWN IMMEDIATE, or SHUTDOWN TRANSACTIONAL. 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. To verify this change, again query the Database_role column of V$DATABASE. This section describes how to configure and verify each prerequisite. [PATCH V3 0/6] ASoC: codecs: Add Awinic AW883XX audio amplifier driver Now we will see a step-by-step approach to perform a switchover between the primary and the logical standby database: . 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). An alternative is to enable flashback database on the primary (and the standby if desired) so in the event of a failover, the primary can be flashed back to the time before the failover and quickly converted to a standby database. This will signal the observer to initiate failover after the FSFO threshold timeout has been reached (default is 30 seconds). Media Recovery - Once the restore is complete, recovery proceeds as a typical media recovery, applying redo from archived and online redologs and rolling back uncommitted changes with undo. Immediately after issuing command in step 2, shut down and restart the former primary instance PRIM: Set the FastStartFailoverThreshold property to specify the number of seconds you want the observer and target standby database to wait (after detecting the primary database is unavailable) before initiating a failover. A broker configuration can belong to multiple groups. If the service has been configured to start automatically (-policy AUTOMATIC), then the service will automatically start only after a database role change. The commands that can be executed for a group of configurations (as declared in an observer configuration file) are as follows. You can create two callout configuration scripts, a Note that a switchover operation may be started before the specified wait Therefore, the primary database can continue processing transactions, even if the target standby database fails. If that metadata is pushed out, Oracle can no longer find a fuzzy snapshot so it will not be able to flash back. Oracle 11g Physical standby data Guard Failover steps - Data Guard Part Among many benefits of using this utility, I highlight that while using it, it will not need manual intervention to recover the databases or eventually a switchover in case the primary database becomes unavailable. 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. Fast-start failover is faster when you take steps to optimize recovery so that the application of redo data to the standby database is kept up to date with the primary database's rate of redo application. Download Ebook Oracle 11g 12c Data Guard With Asm Lab Practice A Make sure that your OS environment on the standby is setup. add service command. The minimum detection time is 6 seconds, which is the default The broker allows the switchover to proceed as long as there are no errors for the primary database and the standby database that you selected to participate in the switchover operation. Note the following points about the observe-only mode: The primary database can enter UNSYNC or LAGGING state without an acknowledgement from the observer or target standby. SUSPENDED is cleared when connectivity with the primary database is restored. In this case, the primary database stalls and prevents any further transactions from If the standby database is not enabled for management by the broker, then the failover cannot occur. Monitoring flashback database history and reacting when it drops below 30 minutes will save you time and improve availability. SQL> ALTER DATABASE COMMIT TO SWITCHOVER TO PRIMARY; After an immediate failover completes, all the standby databases in the configuration, regardless of their type, are disabled. disable fast-start failover with the FORCE option on the To allow the database to register with the Data Guard listener, the listener endpoint must be added to the database's local_listener parameter. For example, if a physical standby database was in the APPLY-OFF state, it will remain in the APPLY-OFF state. 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. The default value is 30 seconds and the lowest possible value is 5 seconds. PDF Download Solutions Oracle Data Guard 11gr2 Administration Beginner S Guide observer computer is returned to you so that you can continue to PeopleSoft can be configured for Active Data Guard. Running a StatusReport on the primary should verify that the error is due to a missing observer. DGMGRL. The VALIDATE FAST_START FAILOVER command parses the callout If the DG_ADMIN environment variable is not set, or the environment variable is set and the specified directory has the Then set the configuration protection mode to maximum availability. The real test of the configuration is a successful role transition in both directions with both switchover and FSFO failover. If you have not used the SET ObserverConfigFile command after starting the current DGMGRL client, then the result will always be: ObserverConfigFile=observer.ora. the current working directory. Verify the primary database instance is open. 1,000,000 block changes on a small set of blocks generates less Flashback Database history than 1,000,000 changes on a larger set of blocks. The redo transport mode used to send redo to the target standby database or the database currently in the primary role. Oracle Real Application Clusters Administration and Deployment Guide for information about Application Continuity, The broker simplifies switchovers and failovers by allowing you to invoke them using a single key click in Oracle Enterprise Manager Cloud Control (Cloud Control) or a single command in the DGMGRL command-line interface (referred to in this documentation as, Ensure that the standby database you choose to be the target of fast-start failover has its, Oracle Data Guard Concepts and Administration. To proceed, you must first disable fast-start failover using the FORCE option, and then perform a manual failover. In this mode, the FastStartFailoverLagLimit configuration property is set to a non-zero value. The broker interacts with Oracle Clusterware or Oracle Restart to ensure that the appropriate database services are active and that the appropriate FAN events are published after a role change. REINSTATE REQUIRED is present only after fast-start failover has occurred and shows on both the new primary database and the database undergoing reinstatement. You can use Cloud Control or DGMGRL, to perform either a complete (recommended) or an immediate failover. the Steps To Congure Oracle 11g Data Guard Physical Standby associate that we give here and check . Credentials Required for Access to Broker Configurations. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. FastStartFailoverThreshold for reference information about the FastStartFailoverThreshold property. SQL> startup ORACLE instance started. See Choosing a Target Standby Database for helpful advice. 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. After a failover, the original primary database can no longer participate in the Data Guard configuration. Ensure that the required permissions are granted to the DG_ADMIN Verifies that the primary and the target standby databases are in the following states: The primary database is enabled and is in the TRANSPORT-ON state. If the FastStartFailoverPmyShutdown configuration property is set to TRUE, then the former primary database will have been automatically shut down and must be manually restarted before the master observer can attempt to reinstate it. See Enabling Fast-Start Failover for more information. The target standby database is enabled and is in the APPLY-ON state. SHOW ObserverConfigFile used to check the runtime property ObserverConfigFile. This feature enables RMAN to duplicate an existing database over the network without requiring a backup to disk or tape. If it detects that Flashback Database was disabled, either manually, or automatically because Flashback Database discovered a problem, Broker signals "ORA-16827: Flashback Database is disabled". directory has the same permissions as its parent directory. To start a switchover using Cloud Control, select the standby database that you want to change to the primary role and click Switchover. Reinstate the original primary database to act as a standby database in the new configuration. In an environment where there are multiple observers configured, stopping the master observer is not allowed unless it is the last running observer. Otherwise, they must be re-created from a copy of the new primary database. By default, a fast-start failover is done when both the observer and the standby cannot reach the primary after the configured time threshold (FastStartFailoverThreshold) has passed. This database property is used to specify how the observer should connect to and monitor the primary and standby database. It will return PRIMARY, 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. 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. observers for a single Data Guard configuration. This file The ObserverOverride configuration property, when set to TRUE, allows an automatic failover to occur when the observer has lost connectivity to the primary, even if the standby has a healthy connection to the primary. Transitions the target standby database into the primary role, opens the new primary database in read/write mode, and starts redo transport services. While not strictly required, creating a wallet provides a secure way to store the credentials needed to automatically connect to the primary when starting the observer. The Data Guard broker and the secondary database both run the observer and observe the primary database for downtime. enabling fast-start failover. files include the observer configuration file (observer.ora), observer log
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