The configuration and database status report that the observer is not running and return one of the following status messages: While the configuration is in the unobserved state, fast-start failover cannot happen. The SHOW CONFIGURATION command will show you which databases can be reinstated and which databases must be re-created. Note that the value of the FastStartFailoverPmyShutdown configuration property must be FALSE for the primary to stall indefinitely under these conditions. command for more information about starting the The lowest possible value is 5 seconds. Stopping the Observer When There is Only One Observer. disable fast-start failover with the FORCE option on the If the configured data loss guarantee cannot be upheld, If there are no registered observers when fast-start failover is enabled, then the first observer started is designated as the master observer, and all others started later are backup observers. After step 3 completes, you can open the new Primary database STAN: Although the default value of 30 seconds is typically adequate for detecting outages and failures on most configurations, you can adjust failover sensitivity with this property to decrease the probability of false failovers in a temporarily unstable environment. The following is an example of starting an observer as a background process: The START OBSERVER IN BACKGROUND command uses Oracle wallet to obtain credentials to log into the database server and register observers. fast-start failover to the target standby database if conditions warrant a failover. Chapter 9 of the Data Guard Broker documentation (10g and 11g) contains a description of each property. This is a good time to enable FSFO to make sure that all of the prerequisites have been met. If you don't already have a Flash Recovery Area (FRA), you will need to create one for Flashback Database. 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. This method will disable fast-start failover on all databases in the broker configuration. Oracle Database PL/SQL Packages and Types Reference, Stop the observer from any computer system in the broker configuration, as described in, Start the observer on the new computer system, as described in Step 8 of, Enable fast-start failover using the DGMGRL, Shut down the primary database and the target standby database using either DGMGRL, Oracle Database Global Data Services Concepts and Administration Guide, Oracle Real Application Clusters Administration and Deployment Guide, Configure the connect descriptor for connect-time failover. Only the observer can initiate FSFO failover. If the former physical standby database was running with real-time query enabled, the new physical standby database will run with real-time query enabled. See Oracle Data Guard Concepts and Administration for more information on using the ALTER SYSTEM FLUSH REDO statement. environment variable is set and the specified directory has the (It is permissible to change the RedoRoutes property on all standby databases including target standby databases. lower detection times for primary database failures. ObserverPingRetry properties before Examine the Broker configuration by logging into dgmgrl on the new primary. Step:6 Notice that the former primary is now disabled. Write Engineering Change Proposal documentation and reports to request permission to install, replace . Thus, the command-line prompt on the observer computer does not The terminal session will appear to hang at this point. If you cannot tolerate any loss of data, then ensure that the configuration protection mode is set to maximum availability or maximum protection. observer computer is returned to you so that you can continue to A high lag limit may lead to more data loss but may lessen the performance impact of the primary database. computer, it automatically starts the observer when you enable Ideally the primary, standby, and observer will be in geographically separate areas. The observer host is 'observer.demo.org'. After you click the Reinstate button, Cloud Control begins reinstating the database. In a DataGuard environment when the Primary instance fails you need to go through the Failover and Reinstate processes in order to restore the database service, as described in the documentation: Changes a standby database to the primary role in response to a primary database failure. 1)What are the steps to do Switchover/Failover operation manually in 2-node RAC and 2-node DATAGUARD environment. If the agent is not 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 specifies how often the observer establishes a new connection to the primary database. If the (Note: 11.1.0.7 adds the StaticConnectIdentifier Broker database property to allow you to specify a different service name.) *PATCH V3 0/6] ASoC: codecs: Add Awinic AW883XX audio amplifier driver [not found] <000701d8e7521f78bc05e6a340awinic.com> @ 2022-11-11 11:26 ` wangweidong.a 2022-11 . Before enabling fast-start failover, use one of the following techniques This page will not allow you to alter the protection mode. 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. This table describes the optional database properties that you can set. You can also query the V$FS_FAILOVER_STATS view to display statistics about fast-start failover occurring on the system. Cloud Control will start the observer. The master observer cannot connect to the target standby database, What Happens if the Observer Fails? Reinstatement restores high availability to the broker configuration so that, in the event of a failure of the new primary database, another fast-start failover can occur. Flashing back a database is much faster and more seamless (one simple DDL statement) than traditional point-in-time or SCN-based recovery. For each observer, the V$FS_FAILOVER_OBSERVERS view provides the 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. Moorestown, New Jersey, United States. We'll leave the other properties at their default values for the walkthrough, but you should become familiar with all of the Broker config and database properties. lag is less than or equal to the value specified by the It has two parts in the following order: Configuration declaration this section is mandatory. During a switchover, the primary database transitions to a standby role, and the standby database transitions to the primary role. That is, if the observer is connected to any instance in the Oracle RAC, all instances will show a value of YES. In this case fast-start failover cannot occur because the databases are not ready to failover. Displays only on a logical standby database that has not yet completed loading a copy of the primary database's data dictionary. learning with R and Python are also covered in this step-by-step tutorial. The Oracle Database 10g FSFO observer is limited to using the default username and password defined in the wallet. There is no impact on your current configuration or on applications. create the directory specified by the DG_ADMIN environment variable and STAN is now transitioned to the primary database role.Now your PHYSICAL STANDBY Database has become PRIMARY. If the DG_ADMIN environment variable is not set, or the When fast-start failover is enabled, the primary and standby randomly choose one of the registered observers to be the master. In this mode, the FastStartFailoverLagLimit configuration property is set to zero. Contains the callout configuration file, pre-callout script, If the Broker configuration is changed to make a bystander the new failover target (probably a good idea if the failed database will be down for a while), the observer will not automatically reinstate the former primary because it is no longer part of the FSFO configuration. FAN events are published using Oracle Notification Services (ONS) for all Oracle integrated database clients in Oracle Database 12c and later. The broker preserves the protection mode that was in effect prior to the failover. In this case, Flashback Database cannot be used to reinstate databases. These clients can be configured for Fast Connection Failover (FCF) to automatically connect to a new primary database after a failover. See Reenabling Disabled Databases After a Role Change for more information. You can switch back to the original Primary database later by performing another switch over. You cannot perform a switchover to a snapshot standby database unless you first convert it back to a physical standby database. Logical standby databases that are disabled during failover can be reinstated. In addition, some standby databases may be disabled by the broker during the failover if the broker detects that they have applied redo beyond where the new primary database had applied. What is true about Data Guard setup with fast-start failover? They must be re-created from a copy of the new primary database. 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 following sections describe how to perform manual failovers: Reenabling Disabled Databases After a Role Change. The act of switching roles should be a well-planned activity. If the status is SUCCESS, you're ready to start testing role transitions. command does not have a network connection to the primary database. Follow Smart way of Technology on WordPress.com. environment variable to specify the default location for client-side broker files. 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). observer, whether it is currently connected to the primary and target standby databases, This list describes restrictions when fast-start failover is enabled. For example: The default value for the FastStartFailoverThreshold property is 30 seconds and the lowest possible value is 6 seconds. This can be avoided by first disabling fast-start failover with the FORCE option on the target standby. You must set both stored in the specified path using the default file names. If you like a connect-time failover to survive across a data guard switchover, you need another way to do it. configuration. For more information, see SET MASTEROBSERVER TO. All physical and snapshot standby databases will be disabled and must be re-created from a copy of the new primary database after a switchover to a logical standby database. been enabled on the database prior to the failover and there must be sufficient Database dismounted. 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. Event notification and database connection failover support is available to database clients connected to local database services when a broker-managed failover occurs. See Performing Manual Role Changes When Fast-Start Failover Is Enabled for more information. configuration file, and fast-start failover callout script files. Since the observer is a specialized instance of a dgmgrl session, the observer host should be installed with either the Oracle Client Administrator software or the full Oracle Database software stack. environment variable must have exclusive permissions wherein it can be accessed only This action will result in loss of data and the possibility of two databases in the configuration simultaneously assuming the primary database role. 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. When you execute commands that affect multiple observers, if you have not specified a name and location for the observer configuration file, then broker searches the current working directory for a file named observer.ora. configuration property. The name of the callout configuration scripts is specified in Errors occurring for any other configuration members will not impede the switchover. Use the wrapper script to start the observer process when the observer host boots or to restart it if it dies. In Maximum Availability mode, FSFO guarantees that no transaction that has received a commit acknowledgment will be lost during a failover. Reinstatement of the failed primary database as a new standby database failed. For information about enabling fast-start failover, see Enabling Fast-Start Failover. Data Guard uses Oracle Net (SQL*Net) for communication between the primary and standby databases and the FSFO observer. PRIM>SHUTDOWN IMMEDIATE; You Any database that was disabled while multiple role changes were performed cannot be reinstated. Suppose you have a primary database, BOSTON, and a standby database, CHICAGO. The following paragraphs describe the supported availability modes. db1_a: Alias to connect to the dynamic Data Guard service on database "a", db1_b: Alias to connect to the dynamic Data Guard service on database "b", db1_a_static: Alias to connect to the static Data Guard service on database "a", db1_b_static: Alias to connect to the static Data Guard service on database "b". To change the FastStartFailoverTarget property to point to a different standby database, disable fast-start failover, set the FastStartFailoverTarget property, and reenable fast-start failover. The service can be started on the physical standby only after the redo generated by starting the service has been applied. 1 second. Disabling fast-start failover does not stop the observer. An application should use caution when calling the DBMS_DG.INITIATE_FS_FAILOVER function because the observer will initiate failover, if at all possible. The following assumes that the standby host has been setup according to Oracle's recommendations and that the operating system, accounts, security, resource limits, directory structure, etc. Synopsis. To verify this change, again query the Database_role column of V$DATABASE. On the new primary database STAN, perform a SWITCH LOGFILE to start sending redo data to the standby database PRIM. See Manual Failover for complete information about manual failovers. This file contains connect identifiers to both the primary and the target standby databases. Create a script to automate FSFO failover initiation and use it as your standard method for standby flips. An observer is an OCI It automatically sets Data Guard related database initialization parameters on instance start and role transitions, starts apply services for standbys, and automates many of the administrative tasks associated with maintaining a Data Guard configuration. In this case, the primary database stalls and prevents any further transactions from Instead, when broker notifies the Oracle Written by authors well-known for their talent with RAC, Pro Oracle Database 11g RAC on Linux . Standby databases that are disabled during switchover, manual failover, or fast-start failover will not be automatically reinstated. Flashback Database is a continuous data protection (CDP) solution integrated with the Oracle Database. If local_listener is already in use, add the Data Guard listener to the list. On the Oracle Data Guard Overview page next to the Fast-Start Failover status field, click Disabled to invoke the Fast-Start Failover page. You will then need to re-create the physical standby databases from a copy of the new primary database before you can reenable them. Log into the new primary and verify that the changes made it across. Bystander standby databases may be disabled by the broker during the failover, and they must be reinstated or re-created before they can serve as standby databases to the new primary database. Oracle Database 11g FSFO adds support for Maximum Performance mode (async redo transfer), providing the flexibility to trade durability for performance. 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. If the switchover transitions a logical standby database to the primary role, then: The original primary database will be switched to a logical standby role. Fast-start failover will not be attempted for the other types of database shutdown (NORMAL, IMMEDIATE, TRANSACTIONAL). on particular instances based on the service configuration. connection, or the database on which you issued the disable fast-start failover The same thing happens if a shutdown and startup of either database occurs - the service that is started is the one that matches the role of the database being started. Set the ObserverPingInterval and In such cases, the failed primary database is reinstated as a physical standby database. Unless action is taken to change the failover target to one of the bystanders, the new primary will be without a failover target until the former primary is reinstated as a standby. You want to prevent fast-start failover from occurring because the primary database will resume service soon. Note that the database will not open at this point. Complete Failovers in Configurations Using Cascaded Standbys. Failovers become routine. Monitoring flashback database history and reacting when it drops below 30 minutes will save you time and improve availability. The original primary database can now be configured as a standby. You can switch back to the original primary and then either retry the switchover to the original target standby, or choose another standby in the configuration to switch over to. SQL> Select Database_role from v$Database; The only exception to this is failovers to snapshot standby databases. This can be done regardless of whether the failover was done to a physical, logical, or snapshot standby database. If the configuration contains both physical and logical standby databases, consider choosing a physical standby database (that has the least amount of unapplied redo) to be the target standby database. Immediately after issuing command in step 2, shut down and restart the standby instance STAN: Enabling Fast-Start Failover describes how to start observers as a part of the step-by-step process to enable fast-start failover. Set the, Configure the connect descriptor with a single network name that is registered with a global naming service such as DNS or LDAP. The observer is perfectly satisfied if all of the redo it needs to meet your durability requirements has been received by the failover target. See the Cloud Control online help for more information. Use Recovery Manager (RMAN) to back up the PeopleSoft database on a regular backup schedule. Fast-start failover enables the Data Guard broker to rapidly and automatically failover to a previously chosen standby database without requiring manual intervention. Oracle Database PL/SQL Packages and Types Reference for more information about the DBMS_DG package. redo generation on the primary database will be stalled. 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). Switching over to a logical standby database results in the snapshot and physical standby databases in the broker configuration being disabled by the broker, making these databases no longer viable as standby databases.

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