We will create 4 SRLs starting with group# 11. Once an observer is started, no further user interaction is required. To run an observer as a background process, use the DGMGRL command START OBSERVER IN BACKGROUND. occur. In a separate terminal session, verify the configuration. callout configuration scripts fsfo_precallout and Any apply delay must be removed before beginning a switchover. Reinstating the Former Primary Database in the Broker Configuration for more information about reinstatement. files to automate tasks that must be performed before and after a fast-start failover 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. failover with the FORCE option on the primary database. Then, on the Failover Confirmation page, click Yes to invoke the default Complete failover option. If they are isolated from each other, then you must first disable fast-start failover by using the FORCE option, and then stop the observer. By default, both files are stored in $ORACLE_HOME/dbs. For systems with multiple RAID controllers, consider creating SRLs such that their IO is balanced across the controllers. The observer does not attempt to reinstate the former primary database. Contains the callout configuration file, pre-callout script, This not only saves time and minimizes problems by automating an otherwise manual process, it exercises your failover and DR procedures with every flip so that you know the FSFO configuration is sound and, in a real emergency, everyone knows what to do. All database connections associated with the observer, including the initial connection, must use dedicated server connections. 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 document only talks about switchover involving physical standby database. During a switchover, the primary database transitions to a standby role, and the standby database transitions to 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. This guide uses the naming convention of appending an underscore followed by a letter to the db_name to create the db_unique_name. Logical standby databases that are disabled during failover can be reinstated. When you run commands that need access to the observer Using Cloud Control, you can view the value of the ApplyLag column for each standby database in the Standby Databases section of the Oracle Data Guard Overview page. See Performing Manual Role Changes When Fast-Start Failover Is Enabled for more information. cannot use a different name for this file. The log file name is specified with the LOGFILE IS option of the START OBSERVER command. Oracle Data Guard work on two database roles Primary and Standby. data (in seconds) specified by the The terminal session will appear to hang at this point. 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. 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. The DB_ROLE_CHANGE event will fire whenever a database is opened for the first time after a role transition. For each temporary table, verifying that temporary files associated with that table on the primary database also exist on the standby database. Look for the desired data in the RAM. In this case, disable fast-start failover using the FORCE option on the target standby database. These are the actions the broker performs after you start a complete failover. Disabling fast-start failover does not stop the observer. The following sections describe how to perform manual failovers: Reenabling Disabled Databases After a Role Change. This may result in two databases in the configuration simultaneously assuming the primary database role. In order to accommodate all load conditions, Oracle recommends having at least one more SRL group than the number of ORL groups of the same size. This article - the seventh in this ongoing . The FS_FAILOVER_STATUS column in the V$DATABASE view for the target standby database displays a reason why fast-start failover cannot occur. Immediately after issuing command in step 2, shut down and restart the former primary instance PRIM: ob2-host can be a master observer when ORACLE instance shut down. The procedure for using RMAN to create a standby database is fully explained in Appendix F of Oracle Oracle Data Guard Concepts and Administration document (10g Rel 2 and 11g Rel 1). Such preparation includes: Ensuring that standby redo log files are configured on the primary 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. You can use this information to identify ahead of time any redo transport configurations that would be incorrect after a role change, including any standbys that will not receive redo because the RedoRoutes property was not configured correctly. In this case, the FS_FAILOVER_STATUS and FS_FAILOVER_OBSERVER_PRESENT columns will appear as shown in the following table and fast-start failover will not occur: Oracle Database Reference for more information about the V$DATABASE view. 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). If the value is non-zero, failover is possible any time the standby database's apply If a non-zero value is specified for the See the Cloud Control online help for more information. You can use the broker's reinstate capability to make a failed primary database a viable standby database for the new primary. Oracle Database 10g databases running versions prior to 10.2.0.4 will remain in a stalled state until aborted or signaled to remain the primary by the observer once connectivity has been restored. ConfigurationSimpleName is created. Therefore, the target standby never falls behind the primary Currently, this state can be detected only when the database is open. Note: Data Guard requires dedicated server connections for proper operation. To allow the database to register with the Data Guard listener, the listener endpoint must be added to the database's local_listener parameter. To restore your original disaster-recovery solution after switchover to a logical standby database or after failover to any standby database, you may need to perform additional steps. To see the specific parameter, use the "show database StatusReport" command. configuration property. 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. this script is run before the fast-start failover is initiated. first recording that a fast-start failover cannot happen. (It is permissible to change the RedoRoutes property on all standby databases including target standby databases. Switchover and Manual Failover for more information about switchovers and manual failovers, respectively. The simple tests described in this guide are fine for making sure the basics are working, but you'll probably want to develop a more comprehensive set of tests suited to your environment and requirements. Notice that the terminal session appears to hang after starting the observer. If Flashback Database fails, automatic reinstatement stops and you will have to perform a manual SCN-based recovery to the standby_became_primary_scn and complete the reinstatement. the preferred method for starting an observer. Running a StatusReport on the primary should verify that the error is due to a missing observer. Refer to the appropriate Oracle RAC or Oracle Restart documentation for further information. Note: You can also use TNS aliases defined in the tnsnames.ora file when setting the local_listener parameter. (as it might in maximum availability and maximum performance modes). (Yes, bystanders need Flashback Database too). Enabling fast-start failover does not trigger a failover. The selected standby database that will be the fast-start failover target must receive redo directly from the primary database. When querying the V$DATABASE view, pay special attention to the following: The FS_FAILOVER_STATUS column, which can contain the values described in Table 6-2. Clusterware agent that the failover completed, the Oracle Clusterware agent opens PDBs command does not have a network connection to the primary database. PeopleSoft can be configured for Active Data Guard. The broker controls the rest of the switchover. ORACLE instance shut down. After the patch has been successfully applied to all databases, take the following steps to enable fast-start failover and start the observer. 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. Determining a Database's Readiness to Change Roles. FSFO is a feature of Broker which records information about the failover target, how long to wait after a failure before triggering a failover, and other FSFO specific properties. the current working directory, Uses standard output for displaying the observer logs. SHOW CONFIGURATION VERBOSE, or SHOW OBSERVER 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. The services required on the primary database are: Log Writer Process (LGWR) - Collects redo information and updates the online redo logs. See the "DISABLE FAST_START FAILOVER" command in Oracle Data Guard Command-Line Interface Reference for more information. fsfocallout.ora. Disabling fast-start failover without the FORCE option can succeed only if the database on which the command is issued has a network connection with the primary database and if the primary database and target standby database have a network connection. Fast-start failover will not occur unless all instances comprising the Oracle RAC primary database are perceived to have failed. If there are physical or snapshot standby databases in the configuration and the switchover occurs to a logical standby database, you need to re-create those databases from a copy of the new primary database and then reenable those databases, as described in Reenabling Disabled Databases After a Role Change. *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 . all of the same type (all physical or all logical standby databases), choose the standby FSFO builds upon a number of other Oracle technologies and features such as Data Guard, Flashback Database, and Data Guard Broker. The service can be started on the physical standby only after the redo generated by starting the service has been applied. Do not attempt to reinstate the old primary database if an ORA-752 or ORA-600 [3020] error has occurred at the failover target. In the following example commands, a service named PAYROLL is configured to be active in the PRIMARY role on the primary database NORTH. standby database, host, or network failure, etc.). time specified by maximum configured We can always fail over to it or have it happen automatically if for some reason the primary Managed Instance has [] WAIT option, broker waits for the amount of an alias of the broker configuration name. 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. Application Continuity is supported for Oracle Data Guard switchovers to physical standby databases. Fast-start failover can incur data-loss within the time specified by FastStartFailoverlagLimit. DG_ADMIN environment variable is not set, the files are stored in In such cases, the failed primary database is reinstated as a physical standby database. Fast-start failover can be used only in a broker configuration and can be configured only through DGMGRL or Cloud Control. fast-start failover. directory does not have the required permissions. client-side broker files, the specified values are used. directory has the same permissions as its parent directory. This allows the appropriate Data Guard services, such as redo transport or redo apply, to be started when the database is restarted later for any reason. A trigger on the DB_ROLE_CHANGE system event can be used to update the naming service and, with the proper client cache TTL settings, clients can connect to the new primary very quickly. The reduced need for manual intervention can increase availability without increasing management costs. redo generation on the primary database will be stalled. If fast-start failover is already enabled, the All Data Guard environments should enable force logging at the database level in order to guard against nologging tablespaces from being added. It is actually a low-footprint OCI client built into the DGMGRL CLI (Data Guard Broker Command Line Interface) and, like any other client, may be run on a different hardware platform than the database servers. You can also reinstate bystander standby databases that were disabled during a failover operation. In this case fast-start failover cannot occur because the databases are not ready to failover. If a single-instance primary database (either Oracle RAC or non-Oracle RAC), or if all instances of an Oracle RAC primary database are shut down with the ABORT option, the observer attempts a fast-start failover. multi-tenant environments Know the database downgrade steps in case the upgraded database isn't compatible with the environment Discover the features and benefits to the organization when it moves from the old database . Broker keeps its configuration details in flat file. SQL>select sequence#, applied from v$archived_log; It has two parts in the following order: Configuration declaration this section is mandatory. process. directory. When you configure data guard using OCI console, the default mode is set to maxprotection. The group of broker configurations to be managed is declared in the observer configuration file. directory by this environment variable does not exist, or the $DG_ADMIN Disabling Fast-Start Failover Using DGMGRL. For Active Oracle Data Guard, it will fail to open up a connection unless its in read-only mode. However, you can change the name or the location of the file if you start the observer using the DGMGRL START OBSERVER command and include the FILE IS qualifier. Fast-start failover will not be attempted for the other types of database shutdown (NORMAL, IMMEDIATE, TRANSACTIONAL). Note the following points about the observe-only mode: The primary database can enter UNSYNC or LAGGING state without an acknowledgement from the observer or target standby. For example: You can find information about the master observer by querying the V$DATABASE view. there is a lost network connection, be aware that the observer may attempt a See Installing and Starting the Observer. November 20, 2009. The playground: By default, the broker always determines whether bystander standby databases will be viable standby databases for the new primary when performing a complete failover. connection, or the database on which you issued the disable fast-start failover This property allows you to specify a priority ordered 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. If any errors occur during either conversion, the broker stops the switchover. Step-by-step instructions for manual reinstatement are described in Reenabling Disabled Databases After a Role Change. Another good test is to simulate network failures that leave the primary up, but isolated from the failover target standby and the observer. A switch-over allows the primary database to switch roles with its standby database. Note that a switchover operation may be started before the specified wait 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. The former primary database is disabled. There can be up to four Note that these properties only affect whether primary shutdown and automatic reinstatement are performed if a fast-start failover occurs because the primary crashed or was isolated from the observer and target standby 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. 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. ensure that it has the required permissions. The time interval specified by the FastStartFailoverThreshold property is ignored if the master observer detects that a user-configurable condition has occurred or if a fast-start failover has been requested by the DBMS_DG.INITIATE_FS_FAILOVER function. If the DG_ADMIN environment variable is not set, or the The new primary database is opened in read/write mode and redo transport services are started. mode when the fast-start failover target is a logical or physical standby database that Table 6-2 FS_FAILOVER_STATUS Column of the V$DATABASE View. SQL> Select Database_role from v$Database; If you initiated a complete failover and it fails, you might need to use immediate failover. If failover occurs to a logical standby database, all physical and snapshot standby databases will be disabled by the broker. Make some new changes and verify that they are preserved after failover. It's good practice to use separate listeners for application connections and Data Guard connections. This can happen for either of the following reasons: A bystander standby database has applied more redo data than the new primary database itself had applied when it was a standby database. Keep this trigger as simple and reliable as possible, limiting it to only what is absolutely necessary at the moment of role transition, since any failures at this point may affect availability. A manual failover is already in progress. To stop an observer currently designated as the master observer, first issue the SET MASTEROBSERVER command to designate a different observer as master observer. Verify there are no active users connected to the databases. A normal shutdown uses SHUTDOWN NORMAL, SHUTDOWN IMMEDIATE, or SHUTDOWN TRANSACTIONAL. 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. PRIM>connect /@PRIM as sysdba If only a path is specified, the files are The existence of a .suc file, 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. When enabling fast-start failover, the broker verifies that the property indicates an existing standby.
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