You can use the Data Guard command-line interface as an alternative to Oracle Enterprise Manager Cloud Control (Cloud Control) for managing a Data Guard configuration. We need to make several changes to the primary database before we can even setup the standby database. Change the role of a database from a standby database to a primary database, or from a primary database to a standby database using either a switchover or a failover operation. Ensures that other standby databases in the broker configuration are viable and receiving redo from the new primary; Integrates Oracle Clusterware and Global Data Services to ensure the correct services are started after role change; To configure broker to initiate switchover, run. Primary Database: mdbc2s2 . The switchover will not be allowed if the mode cannot be maintained because the target standby database of the switchover was the only standby that satisfied the protection mode requirement. DGMGRL Switchover. Connect to the standby database (cdb1_stby) and failover. In dataguard setup, we can make primary database as physical standby database and standby as primary . During a switchover, the primary database transitions to a standby role and the standby database transitions to the [] Step:6 Bounce the primary db and check the switchover status. Method 1: Rebuild from scratch > RMAN duplicate. A switchover guarantees no data loss. New primary database "cdb1_stby" is opening Operation requires start up of instance "cdb1" on database "cdb1" Starting instance "cdb1" ORACLE instance started. First of all, we have to connect to the primary database in DGMGRL. 1.2.1 Redo Transport Services. Oracle Database 12c brought more than 500 new features, and many of them are related to Data Guard enhancements. This is known as switch over. Database mounted. Start SQL*Plus: There are various steps in which you can configure physical standby database. Moreover, cascaded destinations now receive redo in real-time, without waiting for archived log to be switched. Database Role: Physical standby database. CLI is used mostly for configuration and management. We need to make several changes to the primary database before we can even setup the standby database. Messages not getting expired on standby database: 29225076: ORA-25319: queue table repartitioning aborted: Automatic Storage management. Configuration overview Primary database changes Configure network Configure redo transport Build standby Verify standby STEPS: TEST1 Primary TEST2- STANDBY. So far, the Data Guard environment has been rebuilt, you can switchback to production environment again. Ready for Switchover : no. Ready for Failover: Yes (Primary Running) flashback database status: mdbc2s2: off mdbc2s1: on . Switchover by DGMGRL. In a few clicks, you can enable Data Guard and perform switchover, failover, and reinstate actions. Dataguard Switchover Using DGMGRL A switchover is a role reversal between the primary database and one of its standby databases. Step 8 Open physical standby in Read only mode. Let's see a switchover in 11g, it will fail when you connect DGMGRL with local authentication. As a result, we saw ORA-12514 in DGMGRL. Steps to configure read-only STANDBY Action On STANDBY machine. 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 manual failover). Switchovers are started only on the primary database and completed on the target standby database. DGMGRL> SHOW CONFIGURATION; Configuration - my_dg_config Protection Mode: MaxPerformance Members: cdb1 - Primary database cdb1_stby - Physical standby database Fast-Start Failover: DISABLED Configuration Status: SUCCESS (status updated 26 seconds ago) DGMGRL> SHOW DATABASE cdb1; Database - cdb1 Role: PRIMARY Intended State: Perform Switchover Revert Back Lets look at how to perform data guard switchover using broker configuration. Database Role: Physical Standby Database. 1 MOUNTED PHYSICAL STANDBY NOT ALLOWED 2 MOUNTED PHYSICAL STANDBY NOT ALLOWED. -- Here PRIMDB and STYDB are db_unique_name of primary and standby db DGMGRL> show database 'PRIMDB' DGMGRL > show database 'STYDB' DGMGRL> show database verbose 'PRIMDB' 6. It shows replication is enabled to server 10.20.30.77(standby server). Along with overall improvement of Data Guard Broker, support for cascaded standby databases finally came with the release. 4. Once your activity is done, you can revert it back to physical standby using below command. 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 manual failover). So we need to update the recovery.conf file in that standby server. Connect to the new primary (cdb1_stby) and switchover to the new standby database (cdb1). Switchover succeeded, new primary is "cdb1_stby" DGMGRL> Let's switch back to the original primary. Primary Database: d. Ready for Switchover: Yes. Primary Database : d. Ready for Switchover: Yes. In this case, what happens to your database will be in read-only mode. Standby apply-related information: Apply State : running You can use the Data Guard command-line interface as an alternative to Oracle Enterprise Manager Cloud Control (Cloud Control) for managing a Data Guard configuration. Description:- Data Guard broker is a centralized framework to manage entire Data Guard configuration through a client connection to any database in the configuration DGMGRL does not have the ability to create standby (GUI can do it). You can manually set up Data Guard between your on-premises database and a Now Im going to convert the physical standby database into a read-only standby database. As part of managing the switchover, the broker automatically does the following: The DG configuration has the SUCCESS status. Connect to the standby database (db11g_stby) and failover. A switchover guarantees no data loss. 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. d1. You can perform all Data Guard management operations locally or remotely using the broker interfaces: the Data Guard management pages in Oracle Enterprise Manager, which is the broker's graphical user interface (GUI), and the Data Guard command-line interface, called Lets validate the standby database to see if it is ready for switchover: DGMGRL> validate database verbose d1. Database mounted. There are various steps in which you can configure physical standby database. Dataguard Switchover Using DGMGRL A switchover is a role reversal between the primary database and one of its standby databases. DGMGRL> SWITCHOVER TO database_name; Change the role of a database from a standby database to a primary database, or from a primary database to a standby database using either a switchover or a failover operation. During a switchover, the primary database transitions to a standby role, and the standby database transitions to the primary role. Use Oracle Data Guard broker to create, manage, and monitor an Oracle Data Guard configuration. The DG configuration has the SUCCESS status. It shows replication is enabled to server 10.20.30.77(standby server). Switchover succeeded, new primary is "teststby" After the switchover, we check the configuration again. CLI is used mostly for configuration and management. Connect to the new primary (cdb1_stby) and switchover to the new standby database (cdb1). DGMGRL> SHOW CONFIGURATION; Configuration - my_dg_config Protection Mode: MaxPerformance Members: cdb1 - Primary database cdb1_stby - Physical standby database Fast-Start Failover: DISABLED Configuration Status: SUCCESS (status updated 26 seconds ago) DGMGRL> SHOW DATABASE cdb1; Database - cdb1 Role: PRIMARY Intended State: The former primary is down and going to play the standby role, but the data guard broker is unable to mount the instance due to the lost contact. -- Here PRIMDB and STYDB are db_unique_name of primary and standby db DGMGRL> show database 'PRIMDB' DGMGRL > show database 'STYDB' DGMGRL> show database verbose 'PRIMDB' 6. Connected as SYSDBA. DGMGRL> show configuration; Configuration - dg_config Protection Mode: MaxPerformance Databases: teststby - Primary database testdb - Physical standby database Fast-Start Failover: DISABLED Configuration Status: SUCCESS Step:7 Then convert the physical standby into primary db. The former standby is up and now playing the primary role. Database Status: SUCCESS. Description:- Data Guard broker is a centralized framework to manage entire Data Guard configuration through a client connection to any database in the configuration DGMGRL does not have the ability to create standby (GUI can do it). Easy switchover/failover with one command thereby minimizing overall downtime Switchover succeeded, new primary is "cdb1_stby" DGMGRL> You can now connect to the standby database. Change the role of a database from a standby database to a primary database, or from a primary database to a standby database using either a switchover or a failover operation. A database can be in one of two mutually exclusive modes You can be connected to any database in the configuration through DGMGRL to execute the SWITCHOVER command. In this case, what happens to your database will be in read-only mode. Before doing switchover, we have to make sure that the existing standby setup is fine and the archives are getting shipped and applied properly on standby. In a few clicks, you can enable Data Guard and perform switchover, failover, and reinstate actions. Start SQL*Plus: Let's validate the standby database to see if it is ready for switchover: DGMGRL > validate database verbose d1. DGMGRL allows user to query the status of all nodes involved through the local authentication without problem, but it might fail to switchover to a standby database or convert to a snapshot standby. First of all, we have to connect to the primary database in DGMGRL. As a result, we saw ORA-12514 in DGMGRL. FSFO enabled configurations having multiple standbys cannot switchover to a standby that is not the failover target. Configuration overview Primary database changes Configure network Configure redo transport Build standby Verify standby You need to consider all of the options at the time you are building your Oracle Data Guard configuration, including factors such as the characteristics of physical standbys versus logical standbys versus snapshot standbys, the So we need to update the recovery.conf file in that standby server. (start the MRP process).Check whether the logs are applying in the new standby db. ORACLE instance started. The former primary is down and going to play the standby role, but the data guard broker is unable to mount the instance due to the lost contact. This Licensing Information document is a part of the product or program documentation under the terms of your Oracle license agreement and is intended to help you understand the program editions, entitlements, restrictions, prerequisites, special license rights, and/or separately licensed third party technology terms associated with the Oracle software program(s) covered by this View statusreport of databases Switchover using dgmgrl: DGMGRL> connect sys/oracle Password: Connected as sys. The former standby is up and now playing the primary role. 1.2.1 Redo Transport Services. Connected as SYSDBA. As part of managing the switchover, the broker automatically does the following: Messages not getting expired on standby database: 29225076: ORA-25319: queue table repartitioning aborted: Automatic Storage management. Switchover: After After the switchover is completed, each database has the role opposite to the one that it had before the switchover. Post failover, there are two methods of rebuilding your failed primary. There are many factors to take into consideration when selecting a standby database to be the next primary database after a switchover or a failover. That is to say, the switchover is incomplete, but it does not mean a failure. DGMGRL: Switchover Fails To Start New Standby with ORA-27137 When Database Configured To Use Large_pages='ONLY' (Doc ID 2004397.1) Last updated on FEBRUARY 02, 2022. Convert the initialization Database mounted. Static Service For Data Guard Broker DGMGRL> connect sys@primdb1 Password: Connected. Method 2: Flashback database > only if Flashback was enabled. 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 manual failover). This is typically done for planned maintenance of the primary system. DGMGRL. DGMGRL Switchover. The standby database is created with the same database version as that of the primary. 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. The standby database is created with the same database version as that of the primary. This Licensing Information document is a part of the product or program documentation under the terms of your Oracle license agreement and is intended to help you understand the program editions, entitlements, restrictions, prerequisites, special license rights, and/or separately licensed third party technology terms associated with the Oracle software program(s) covered by this Switchover succeeded, new primary is "cdb1" DGMGRL> Database Failover If the primary database is not available the standby database can be activated as a primary database using the following statements. In this article, we will set up physical standby on Oracle Linux 7.6 server. Let's see a switchover in 11g, it will fail when you connect DGMGRL with local authentication. Ready for Failover: Yes (Primary Running) Capacity Information:. Connect to Data Guard Broker [oracle@primary-19c ~]$ dgmgrl DGMGRL> connect sys@primdb Password: Connected to "PRIMDB" Connected as SYSDBA. 7.1 Prerequisites for Getting Started. That is to say, the switchover is incomplete, but it does not mean a failure. The switchover will not be allowed if the mode cannot be maintained because the target standby database of the switchover was the only standby that satisfied the protection mode requirement. View statusreport of databases Switchover using dgmgrl: DGMGRL> connect sys/oracle Password: Connected as sys. DGMGRL. Switchover succeeded, new primary is "db11g" DGMGRL> Database Failover If the primary database is not available the standby database can be activated as a primary database using the following statements. Connect to Data Guard Broker [oracle@primary-19c ~]$ dgmgrl DGMGRL> connect sys@primdb Password: Connected to "PRIMDB" Connected as SYSDBA. During a switchover, the primary database transitions to a standby role and the standby database transitions to the [] 6.Update the recovery.conf file in standby server.-- recovery.conf file resides inside data directory. DGMGRL> VALIDATE DATABASE 'South_Sales'; Database Role: Physical standby database Primary Database: South_Sales Ready for Switchover: Yes Ready for Failover: Yes To perform the failover operation, you must connect to the standby database to which you want to fail over as a user that has the SYSDG or SYSDBA privilege. Now Im going to convert the physical standby database into a read-only standby database. As part of managing the switchover, the broker automatically does the following: Static Service For Data Guard Broker Switchover succeeded, new primary is "cdb1_stby" DGMGRL> You can now connect to the standby database. Switchover by DGMGRL. Database mounted. You can perform all Data Guard management operations locally or remotely using the broker interfaces: the Data Guard management pages in Oracle Enterprise Manager, which is the broker's graphical user interface (GUI), and the Data Guard command-line interface, called Step:9 Apply the redo log files in newly created standby. Standby: Hosts: exa505,exa506, DB Unique Name: STGAU02S, Instance Names: STGAU021 ===== Getting ORA-1017 during switchover from dataguard broker for RAC database DGMGRL> SWITCHOVER TO 'STGAU02S'; Performing switchover NOW, please wait Operation requires a connection to instance "STGAU02S" on database "STGAU02S" Step:9 Apply the redo log files in newly created standby. DGMGRL> VALIDATE DATABASE 'South_Sales'; Database Role: Physical standby database Primary Database: South_Sales Ready for Switchover: Yes Ready for Failover: Yes To perform the failover operation, you must connect to the standby database to which you want to fail over as a user that has the SYSDG or SYSDBA privilege.
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