data guard failover steps

This action may result in two databases in the configuration simultaneously assuming the primary database role. Most in-progress failures cannot be restarted (for example, archived redo log file corruption on the primary database). 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. If possible, confirm that fast-start failover has not If it reconnects to the primary database before the standby agrees to fail over, then the master observer will stop attempting to initiate a fast-start failover. Tailing the alert logs on the primary and standby is a good way to watch Broker in action and get familiar with how it performs various tasks. If both of those observers are unavailable, the observers (For example, if the DBMS_LOGSTDBY.SKIP procedure was used to specify which database operations done on the primary database will not be applied to the logical standby database.). Make sure that xdpyinfo exist under PATH variable. Note that if failover was performed on a snapshot standby database, the old primary must be either reinstated or re-created as a physical standby database. You cannot perform a switchover to a snapshot standby database unless you first convert it back to a physical standby database. ConfigurationSimpleName is created. The example below takes advantage of the 11g RMAN Active Database Duplication feature. This document only talks about switchover involving physical standby database. https://www.facebook.com/dbahariprasath/? See Sources of Diagnostic Information for details about the broker's drc* log files. the primary and target standby databases. You can use the maximum protection, maximum availability, or maximum In such a case, no attempt is made to transmit any unsent redo from the cascader to the terminal standby. lower detection times for primary database failures, you must If the primary database is an Oracle Real Application Clusters (Oracle RAC) database, the master observer will attempt to connect to one of the remaining primary instances. Oracle Data Guard helps you change the role of databases between primary and standby using either a switchover or failover operation. Cancel MRP process. So if the original Primary database is still accessible, you should always consider a switchover first. If fast-start failover is enabled you can still perform a switchover or a manual failover as long as certain conditions are met. FSFO uses Flashback Database as part of the process of reinstating a failed primary as a standby. Multiplexing SRLs merely adds unnecessary IO and can increase commit latency. The observer's main purpose is to enhance high availability and lights out computing by reducing the human intervention required by the manual failover process that can add minutes or hours to downtime. database. Another standby database that does not have connectivity with the primary database, fast-start failover is disabled for this database. Failing over the database won't do much good if applications and other database clients don't know where the primary went. More specifically, we can have an asynchronous second read-only Managed instance in the same or in a different region. You must provide a connect identifier, through which one or more databases in a specific broker configuration can be reached. Use synonyms for the keyword you typed, for example, try "application" instead of "software.". Unlike ORLs, SRLs should be created with only one member per group. For example: You can find information about the master observer by querying the V$DATABASE view. 1)What are the steps to do Switchover/Failover operation manually in 2-node RAC and 2-node DATAGUARD environment. What is true about data guard set up with fast-start failover (FSFO) in Oracle Cloud Infrastructure (OCI)? In order to fully automate switchover, Broker needs SYSDBA credentials in order to restart one or both databases. PRIM>STARTUP MOUNT; If the DG_ADMIN environment variable is not set, or the 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. This list contains some recommendations to obtain better performance when using fast-start failover. We will create 4 SRLs starting with group# 11. You might, for instance, use this to allow the observer to monitor the databases using the same connect identifiers as the client applications. Check the database role,open_mode in standby server. alter database set standby database to maximize availability; If you don't already have a standby database, use your favorite method to create one. File. For systems with multiple RAID controllers, consider creating SRLs such that their IO is balanced across the controllers. Verify Before Switch-over: If you are not using Oracle Clusterware or Oracle Restart, then you must create static service names so that the observer can automatically restart a database as part of reinstatement. connectivity with target standby. When the observer loses its connection to the primary database for a period of time greater than that specified by the FastStartFailoverThreshold property, it attempts a failover to the standby database. change tracking enabled, broker enables block change tracking on the new The observer automatically starts the reinstatement process. After a role change, the naming service can be updated with the new primary's address. SHOW OBSERVER command to confirm that the switch took place. If fast-start failover is disabled, then manual failover may still be possible. observer. In the following example commands, a service named PAYROLL is configured to be active in the PRIMARY role on the primary database NORTH. Use Broker's "show configuration" command to determine FSFO status and the "show database statusreport" command to drill down for details if Broker reports a problem. You can register up to four observers to monitor a single Data Guard broker configuration. lower detection times for primary database failures. Use Recovery Manager (RMAN) to back up the PeopleSoft database on a regular backup schedule. A normal shutdown prevents a fast-start failover until the primary database and standby database are connected and communicating again. If the designated fast-start failover target develops a problem and cannot be the target of a failover, then the broker automatically changes the fast-start failover target to one of the other candidate targets. The primary and target standby must have connectivity for the STOP OBSERVER command to complete successfully. It is also supported for fast-start failover to physical standbys in maximum availability data protection mode. the Steps To Congure Oracle 11g Data Guard Physical Standby associate that we give here and check . The new ConfigurationWideServiceName configuration property can be used to simplify setting up this connect identifier. crash, data in this file can be used to restart the observer to the 3. Only the master observer can coordinate fast-start failover with Data Guard broker. operation. Only the observer can initiate FSFO failover. directory does not have the required permissions. When you are experiencing network disconnections and you issue the DISABLE FAST_START FAILOVER FORCE command on the primary database or a standby database that does not have connectivity with the primary database, fast-start failover may not be disabled for all databases in the broker configuration. SQL>ALTER SYSTEM SWITCH LOGFILE; This section describes how to stay on top of your FSFO environments. Improper Oracle Net configuration is a leading cause of reported FSFO issues. Transitions the target standby database into the primary role, opens the new primary database in read/write mode, and starts redo transport services. Add the wallet location and override to sqlnet.ora. The simplest way to do this is to abort the primary. In the following example, a service named sales is configured to be active in the PHYSICAL_STANDBY role on the primary database NORTH. Controlfile is permanently damaged because of a disk failure. Currently, this state can be detected only when the database is open. Note the use of "/@" to login using the wallet. If you intend to switch back to the original primary database relatively soon, you may allow the physical and snapshot standbys to remain disabled. In this case, disable fast-start failover using the FORCE option on the target standby database. You must manually re-create the database as a standby database and then reenable it. This property also affects whether the broker skips viability checks of bystander standby databases when a fast-start failover occurs. Now your old standby database is become primary database, it is highly recommended to consider immediate full backup of primary database. For example: Scenario 6: Enabling Fast-Start Failover and Starting the Observer. Credentials Required for Access to Broker Configurations. This can be avoided by first disabling fast-start failover with the FORCE option on the target standby. 2. The broker disables all of the physical and snapshot standby databases in the configuration. SET ObserverConfigFile used to specify a customized observer configuration file. The primary database was shut down without using the ABORT option. The minimum value of ObserverPingInterval is 100 Notice that the terminal session appears to hang after starting the observer. Chapter 9 of the Data Guard Broker documentation (10g and 11g) contains a description of each property. An existing connection which is already closed from the database side would throw an error. the observer was killed after the stall began, but before the failover timeout had elapsed). Tasks that must be performed before and after a fast-start failover Verify the configuration from both hosts. VALIDATE Data Guard Switchover/failover to standby The standby database will be activated to serve as the primary database at some point in its life cycle. 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. If the status is SUCCESS, you're ready to start testing role transitions. 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. Issue the following command while connected to any database in the broker configuration, except the database that is to be reinstated: The newly reinstated standby database will begin serving as a standby database to the new primary database. may allow the primary database to continue redo generation after The FS_FAILOVER_OBSERVER_PRESENT column displays YES for the target standby database. Standby databases that are disabled during switchover, manual failover, or fast-start failover will not be automatically reinstated. Immediately after issuing command in step 2, shut down and restart the standby instance STAN: If the database is managed by Oracle Clusterware, broker does not open any of the These conditions are described in the following table: Dictionary corruption of a critical database. Each database in a Data Guard configuration must have a unique name. When performing a failover in a configuration whose standbys are all of the same type, choose the standby database that has the smallest transport lag. Note that this does not guarantee no data will be lost. 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. *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 . set the ObserverPingInterval and SQL Apply on all other bystander standby databases automatically begin applying redo data received from the new primary database. the SYSDG or SYSDBA privilege. Note: Many of the Broker database properties correspond to database spfile parameters. Specifying Preferred Observers Based on Current Primary. 1. Sign in to Azure In maximum availability mode, set the LogXptMode database property for both the primary and target standby databases to SYNC or FASTSYNC. Such preparation includes: Ensuring that standby redo log files are configured on the primary database. Written by authors well-known for their talent with RAC, Pro Oracle Database 11g RAC on Linux . if the observer is not running, The master observer and the target standby database are inconsistent with regard to the current state of the broker configuration, If the protection mode is maximum availability or maximum protection and the target standby database was not synchronized with the primary database at the time the primary database failed, If the protection mode is maximum performance and the apply point of the target standby database lags the redo generation point of the primary database by more than the amount specified by the FastStartFailoverLagLimit configuration property at the time the primary database failed.

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