Fast-Start Failover allows Data Guard to automatically failover to a previously chosen standby database without requiring manual intervention to invoke the failover. By choosing the standby database with the least amount of unapplied redo, you can minimize the overall time it takes to complete the switchover operation. In order for Flashback Database to succeed, there must be sufficient history available in the Flashback Database logs and all of the redo generated between the restore point and the standby_became_primary_scn must be available. Note that the broker does not use the properties to set up redo transport services and Redo Apply services until you actually switch over the primary database to the standby role. By default, the broker always determines whether bystander standby databases will be viable standby databases for the new primary when performing a complete failover. Contains the observer log file for the broker configuration named To maximize the benefits of FSFO, the observer should run on a different host than the primary and standby databases. If you want the broker to skip this viability check of bystander standby databases during a complete failover, thus decreasing the overall failover time, set the BystandersFollowRoleChange configuration property to NONE. How to reinstate the old Primary as a Standby after Failover in #Oracle Immediate Failovers in Configurations Using Far Sync Instances. If the standby database is not enabled for management by the broker, then the failover cannot occur. this script is run before the fast-start failover is initiated. Errors occurring for any other configuration members will not impede the switchover. 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. 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. STAN is now transitioned to the primary database role.Now your PHYSICAL STANDBY Database has become PRIMARY. DG BrokerDG BrokerData Guard BrokerOracleDGRMAN Duplicate . Specifying the Observer Configuration File. directory by this environment variable does not exist, or the $DG_ADMIN times that the observer retries a failed ping before it initiates a 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. Some of the statistics that can be monitored are as follows: LAST_FAILOVER_TIME that shows the timestamp of last fast-start failover, LAST_FAILOVER_REASON that shows the reason for the last fast-start failover. See the START OBSERVER command for more information. Oracle Data Guard 11gr2 Administration Beginner S Guide As recognized, adventure as well as experience practically lesson, amusement, . connection, or the database on which you issued the disable fast-start failover set the ObserverPingInterval and 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. Ensure SPFILE is used SQL> sho parameter spfile 2. directory specified by this variable does not exist, or the directory does not have the The ObserverReconnect configuration property specifies how often the observer establishes a new connection to the primary database. Manual Failover in Data Guard - ORACLE-HELP Setup a high availability design for Oracle Data Guard (Fast-Start 3. This is particularly useful when registering with multiple listeners where the parameter value would otherwise exceed the 255 character limit. Written by authors well-known for their talent with RAC, Pro Oracle Database 11g RAC on Linux . 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. If there is more than one standby database in the configuration, you must explicitly set the FastStartFailoverTarget property on the primary database to name one or more candidate target standby databases. Create a unique connect alias for each database. 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. The v$database view has has columns specifically for monitoring FSFO status. [PATCH v5 0/6] Add Toshiba Visconti Video Input Interface driver To disable fast-start failover, use the Fast-Start Failover wizard in Cloud Control or the DGMGRL DISABLE FAST_START FAILOVER [FORCE] command. *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 . Use the wrapper script to start the observer process when the observer host boots or to restart it if it dies. under the $DG_ADMIN directory. This table describes the optional database properties that you can set. is guaranteed to lose no more than the amount of Add the wallet location and override to sqlnet.ora. After the patch has been successfully applied to all databases, take the following steps to enable fast-start failover and start the observer. In an Oracle Data Guard configuration, the SRVCTL -startoption for a standby database is always set to OPEN after a switchover. Examples of starting observers using DGMGRL are included in Scenario 6: Enabling Fast-Start Failover and Starting the Observer. failover configuration file, this script is run. Standby databases that are disabled during switchover, manual failover, or fast-start failover will not be automatically reinstated. (Yes, bystanders need Flashback Database too). In fact, failovers are so reliable, fast, and simple that switchovers become the exception rather than the rule. Here's a one-liner observer startup for *nix. In previous releases, OCI and ODP.NET clients receive FAN notifications via Oracle Advanced Queuing (AQ). Enabling fast-start failover and starting an observer process involves the following tasks. This section describes how to stay on top of your FSFO environments. November 20, 2009. This is the recommended method for disabling fast-start failover. In cases where Cloud Control will start the observer. There's a big difference between a system that's FSFO enabled and one that's FSFO ready. It wouldn't be much of a test if we didn't verify that our durability constraints were being met, so let's make a change on the primary and see if it survives the failover. To proceed, you must first disable fast-start failover using the FORCE option, and then perform a manual failover. Clusterware: The broker notifies Oracle Clusterware to stop active You can query the V$FS_FAILOVER_STATS view on the primary database to display statistics about fast-start failovers that have occurred on the system. 2. See Oracle Enterprise Manager Command Line Interface. Note the use of "/@" to login using the wallet. 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. Please contact us at contactus@smarttechways.com. STANDBY>ALTER DATABASE OPEN; A simple example for *nix is provided below that will work with both releases. This file Starting with 10.2.0.4 (including all versions of 11g and later), Oracle provides the FastStartFailoverPmyShutdown Broker property that allows you to specify what the primary should do if it is still in a stalled state when the FSFO threshold timeout has elapsed. It will return PRIMARY, 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. (as it might in maximum availability and maximum performance modes). New sql server failover cluster installation greyed outtrabajos To move the observer to another computer: There is no need to disable fast-start failover when you move the observer. They must be re-created from a copy of the new primary database. This directory is created when you run the 12c Dataguard, In required permissions, DGMGRL reports an error. By default the file is named fsfo.dat and is created in the working directory where the observer is started. Now your old standby database is become primary database, it is highly recommended to consider immediate full backup of primary database. Ideally the primary, standby, and observer will be in geographically separate areas. Log in as a test user and make some changes that won't impact other parts of the system. If Flashback Database was enabled on the primary database.If not, the whole setup process must be followed, but this time using the original primary server as the standby. observer, whether it is currently connected to the primary and target standby databases, crash, data in this file can be used to restart the observer to the How to Implement Fast-Start Failover 11g - Ed Chen Logic The default value is 30 seconds and the lowest possible value is 5 seconds. For example, if all your physical standbys are also unavailable, then failing over to a logical standby is your only choice. An observer can be moved from one computer to another through a process of stopping it on one system and and re-starting it on another. the primary role, use the PreferredObserverHosts 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 use the broker's reinstate capability to make a failed primary database a viable standby database for the new primary. 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). FastStartFailoverAutoReinstate is set to FALSE, Another failover or switchover occurred after the fast-start failover completed but before the former primary database restarted, The master observer cannot connect to the former primary database, The former primary database cannot connect to the new primary database, The former primary database and the new primary database are not configured in the same fast-start failover environment, The former primary database was disabled because of a manual failover when fast-start failover was disabled.
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