Databases that can be reinstated will have the following status value: For the REINSTATE command to succeed, Flashback Database must have Once an immediate failover is started, the broker: Verifies that the target standby database is enabled. If a failure occurs once a reinstatement operation (automatic or manual) is underway, the broker logs the appropriate information in the broker configuration files and broker log files. directory does not have the required permissions, broker does the following: When you run DGMGRL commands, if a path and file name are explicitly specified for Select name,open_mode,database_role from v$database; Step:2 Cancel the MRP process Careful consideration should be given before enabling fast-start failover for either of these conditions because doing so will supersede availability options provided by Oracle Clusterware. They must be re-created before they can serve as standby to the new primary database. When using DGMGRL, you need to issue the SWITCHOVER command, specifying the name of the standby database that you want to change into the primary role. Valid values are >= 100. FSFO enabled configurations having multiple standbys cannot switchover to a standby that is not the failover target. If both of those observers are unavailable, the observers Startup can fail with "ORA-16647: could not start more than one observer" even when no observer is actually running if the previous observer process terminated without deregistering itself and the new observer isn't using the previous fsfo.dat file. Click Failover. SQL> Select Database_role from v$Database; Hi, I am working in IT industry with having more than 10 year of experience, worked as an Oracle DBA with a Company and handling different databases like Oracle, SQL Server , DB2 etc If automatic reinstatement fails, the broker will log errors and the former primary database will remain in the mounted state. second. Stopping a Specific Observer When There are Multiple Observers. You can query the V$DATABASE view to verify that the observer is started and the configuration is ready for fast-start failover. Disable fast-start failover using the DGMGRL DISABLE FAST_START FAILOVER command. Fast-start failover can incur data-loss within the time specified by FastStartFailoverlagLimit. The ObserverPingInterval This directory is created when you run the Fast-start failover will not be attempted for the other types of database shutdown (NORMAL, IMMEDIATE, TRANSACTIONAL). Note that the FastStartFailoverThreshold property can be changed even when fast-start failover is enabled. prolonged stall, either the observer or target standby database standby database, host, or network failure, etc.). For each temporary table, verifying that temporary files associated with that table on the primary database also exist on the standby database. The list is empty by default. 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. Oracle Database 11g FSFO adds support for Maximum Performance mode (async redo transfer), providing the flexibility to trade durability for performance. After a switchover completes, the broker preserves the overall Oracle Data Guard protection mode as part of the switchover process by keeping the protection mode at the same protection level (maximum protection, maximum availability, or maximum performance) it was at before the switchover. To stop an observer currently designated as the master observer, first issue the SET MASTEROBSERVER command to designate a different observer as master observer. The word ALL cannot be used as a group name because it is a reserved keyword. FAN server-side callouts can be configured on the database tier. disable fast-start failover with the FORCE option on the When the process is complete, the database will be enabled as a standby database to the new primary database, and Cloud Control displays the Oracle Data Guard Overview page. 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. On Linux/Unix, the directory specified by the DG_ADMIN environment The string "NONAME" cannot be used as an observer name. All standbys other than the failover target are considered bystanders (v$database.fs_failover_status = 'BYSTANDER'). Initiate the failover on the standby database STAN: In previous releases, OCI and ODP.NET clients receive FAN notifications via Oracle Advanced Queuing (AQ). Most in-progress failures cannot be restarted (for example, archived redo log file corruption on the primary database). All Data Guard environments should enable force logging at the database level in order to guard against nologging tablespaces from being added. When both databases have been restarted, you may restart the observer. When fast-start failover is enabled, the broker determines if a failover is necessary and initiates the failover to the current target standby database automatically, with no need for manual intervention. FastStartFailoverLagLimit property. You might, for instance, use this to allow the observer to monitor the databases using the same connect identifiers as the client applications. file, observer runtime data file (fsfo.dat), fast-start failover callout If the configuration contains physical, snapshot, and logical standby databases, consider choosing a physical standby database as the target standby database. (It is permissible to change the RedoRoutes property on all standby databases including target standby databases. Note that this does not guarantee no data will be lost. on particular instances based on the service configuration. alter database recover managed standby database cancel; Step:3 The below commands will help to bring up standby as primary. Managed recovery process has been stopped between primary and standby database and standby becomes primary 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. 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. The VALIDATE FAST_START FAILOVER command parses the callout The Marketplace image that you use to create the VMs is Oracle:Oracle-Database-Ee:12.1..2:latest. SQL> select name,open_mode,database_role from v$database; NAME OPEN_MODE DATABASE_ROLE --------- -------------------- ---------------- MYTEST MOUNTED PHYSICAL STANDBY Step 2: Apply the following command to finish database recovery. You cannot perform a switchover to a snapshot standby database unless you first convert it back to a physical standby database. To maintain a viable disaster-recovery solution in the event of another disaster, you may need to perform additional steps. broker configuration, you must connect through another DGMGRL client November 20, 2009. Failover:- In case of worst situation with data guard primary database, or not available for production than we can activated standby database as a primary production database. status before the crash. For more details about managing Redo Apply services using properties, see Managing Log Apply Services. 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. This may take a few minutes. Once the observer is started, you cannot change the file's name and location. Theoretically, this method can be used when a data guard failover occurred between the primary and standby database, but not a switchover. Broker will verify that the configuration meets all prerequisites before enabling FSFO and will report any problems it finds. For example: Ordinarily the observer connects once to the primary and does not attempt to reconnect unless the connection has failed. /home1/dataguard/config_NorthSales/callout/fsfocallout.ora. the preferred method for starting an observer. See Enabling Fast-Start Failover for more information. ObserverPingRetry properties before What is true about Data Guard setup with fast-start failover? Flashback Database is a continuous data protection (CDP) solution integrated with the Oracle Database. Otherwise, the DUPLICATE TARGET DATABASE command will fail with "RMAN-20208: UNTIL CHANGE is before RESETLOGS change". fsfocallout.ora. The command SHOW OBSERVER provides detailed information about registered observers. If the database is managed by Oracle Clusterware, broker does not open any of the Because the broker performs the failover after converting the snapshot standby database to a physical standby database, it is likely that all standby databases in the configuration will still be available as standby databases to the new primary database after the failover operation completes. Specifying the Observer Configuration File. command START OBSERVER IN BACKGROUND. See the Cloud Control online help for more information. MASTEROBSERVERHOSTS, DGMGRL reports an error if the The playground: A switch-over allows the primary database to switch roles with its standby database. They must be re-created from a copy of the new primary database. After an immediate failover completes, all the standby databases in the configuration, regardless of their type, are disabled. 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. The broker verifies the state and status of the databases to ensure that the switchover transitioned the databases to their new role correctly. You can specify particular conditions for which a fast-start failover should occur using either Cloud Control or the DGMGRL ENABLE FAST_START FAILOVER CONDITION and DISABLE FAST_START FAILOVER CONDITION commands. observer. the primary database and the target standby database do not have a network You can optionally indicate the database health conditions that should cause fast-start failover to occur. You must ensure that the primary database is shut down prior to performing a manual failover. Before a Verifies that the target standby database is enabled. This list contains some recommendations to obtain better performance when using fast-start failover. Required fields are marked *. upheld. If provided, then each group needs to have at least one broker configuration declared in the second part. Once fast-start failover is enabled, the broker will ensure that fast-start failover However, fast-start failover cannot occur when the target standby database is in an unobserved state. Use the 'show fast_start failover' command to see which user configurable FSFO failover conditions are in effect. Duplicate configuration names in configuration definitions are not allowed. Oracle Database 11g observers are incompatible with 10g databases and vice-versa. 1. this script is run before the fast-start failover is initiated. When the conditions for fast-start failover are met, the Broker adds messages to the observer log and broker log indicating that fast-start failover would have been initiated. Displays on the primary database after loss of connectivity to the target standby database and the change to the UNSYNCHRONIZED state (maximum availability mode) or to the TARGET OVER LAG LIMIT state (maximum performance mode) cannot be confirmed by either the target standby database or the observer. Starting the Observer as a Background Process Using SQL>SHUTDOWN IMMEDIATE; Use Recovery Manager (RMAN) to back up the PeopleSoft database on a regular backup schedule. Performing failover : Step 1: Check Standby Database role. It must appear as the first part of an observer configuration file. The target standby database has contact with the primary database. The broker initiates a failover after the number of seconds specified by this If the primary is unable to contact the standby after a user specified period of time (NET_TIMEOUT option of log_archive_dest_ n), it drops out of synchronous transfer mode and begins operating as though it were in Maximum Performance mode. Valid values are >= 10. If a non-zero value is specified for the In maximum performance mode, the ability to automatically failover is restored Stores the observer runtime data file and observer configuration file in 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. The Appendix provides information oncreating a simple wrapper script to start the observer as a background process. 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. 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. FastStartFailoverLagLimit property. present, you must start the observer manually using the following If the target standby database is a snapshot standby database, all of its instances must be restarted to the mount mode before performing failover. When the configuration has only one registered observer, if the primary and target standby databases stay connected but the connection to the observer is lost, then the broker reports that the configuration is not observed. The default name of the observer runtime data file is The master observer never waits for the threshold to expire to perform a fast-start failover in the following situations: If the master observer determines that any of the user-configurable conditions has been detected, then it attempts a fast-start failover. Disabling fast-start failover does not stop the observer. If the primary database can be mounted, it may be possible to flush any unsent redo data from the primary database to the target standby database using the ALTER SYSTEM FLUSH REDO SQL statement. VALIDATE failover with the FORCE option on the primary database. If no name is specified for the observer then a default observer name, the host name of machine where the START OBSERVER command is issued, is used. When restarting the databases, you may restart them in any order. Group definition this section is optional. If there is only one registered observer, then it works in the same manner that a single observer worked prior to the advent of multiple observers in Oracle Database 12c Release 2 (12.2.0.1). When a primary loses contact with both the failover target and the observer simultaneously, it enters a "stalled" state (v$database.fs_failover_status = 'STALLED') and any sessions still connected to the primary will block on commit. Note: Data Guard requires dedicated server connections for proper operation. For zero data loss in maximum availability mode, the FastStartFailoverLagLimit property must be set to zero. What is true about Data Guard setup with fast-start failover? operation can be automated using callout scripts. through these services to exit or for the specified wait time Metadata for the fuzzy snapshot is stored in the flashback log itself. DG_BROKER_START is set to TRUE and DG_BROKER_CONFIG_FILEn are set correctly SQL> sho parameter broker Additionally, the new master observer is identified in the output shown for the SHOW FAST_START FAILOVER and SHOW OBSERVER commands. Other logical standby bystander databases in the broker configuration will remain viable after the switchover. A running observer will follow the primary automatically after a role transition, but a newly (re)started observer won't start if the initial connection is to a down database or one with an out of date or corrupted Broker config file. A switchover guarantees no data loss. The standby can be physical or logical and there can be multiple standbys, but only one of the standbys can be the failover target at any given time. Immediately after issuing command in step 2, shut down and restart the standby instance STAN:
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