Oracle active data guard overview of the exercises the exercises are set up to walk you through oracle database 11g active data guard using sqlplus and the broker working with a physical standby redo apply database using active data guard to read your data as redo is. During switchover, the primary and standby must be able to communicate directly with each other and. See using far sync instances in oracle data guard concepts and administration for examples of how to set up such configurations correctly so that the far sync instances can service the new roles of the two databases after switchover. Switchover to a logical oracle instance will invalidate all the physical standby databases in the data guard configuration. For detailed best practices for the comprehensive use of. She is an oracle 10g certified professional and 9i certified associate.
Oracle 12cstep by step manual data guard switchover. Manage the process of resolving any gaps in the archived redo log files due to a network failure. If the primary database becomes unavailable, then you can use oracle data guard to switch or fail over the standby database to the primary role. But i cant blame the customer as this rule is well hidden in the documentation.
We have primary and two standby database on this data guard environment. A switchover guarantees no data loss and is typically done for planned maintenance of the. Data guard for manual failover, step by step oracle. In my previous article we have covered how to configured oracle 11g data guard on centos 6. After a switchover, each database continues to participate in the data guard. Set up and manage oracle data guard using oracle enterprise. My customer did not want to enable fast start failover but to leave the decision to failover in case of a major crash to the management team. A logical oracle instance should only be considered in situations when there are no physical standby databases in the data guard configuration, or there is only one physical oracle instance that shares the host machine with the primary database. This was rac running on one node in a cluster with failover protection, the same as the. Step 11 restart redo apply if it has stopped at any of the other physical standby. With this setup in place, the standby database is created and managed from oracle grid control as follows. In this article, i will write about how to switchover from the previous article scenario. A switchover guarantees no data loss and is typically done for planned maintenance of the primary system. The proper configuration of oracle data guard redo apply and sql apply is essential to.
This section will provide the steps required to perform switchover to the logical standby database. Perform the following steps to complete the configuration of data guard and enable redo transport from the primary database and redo apply in the standby database. By activeactive, it means bothall sites are up, running, and accessible. Oracle 12c data guard switchover and switchback ktexperts. Tip the standby databases in oracle cloud infrastructure database are physical standbys. To determine the appropriate data protection mode for your application, perform the following steps. During a complete failover, the broker performs the failover steps described in. With dgmgrl, i can manage the configuration of oracle data guard and provides an easier way to interact with the environment after it is setup. The article assumes the following servers are present. Performing a switchover to a physical standby database. Manual switchover standby database in oracle 10g find. To start working with dgmgrl, first log into the standby database server. During a complete failover, the broker performs the failover steps described in section 5. This article is a repeat of the manual 11gr2 data guard setup described here, but here the data guard setup and administration is performed using the data guard broker.
Oracle 12c step by step manual switchover data guard. In short, the failover is the deformation of the production primary database and activating standby database as the primary. In order to perform a switchover, i will be using the oracle data guard broker dgmgrl. After a switchover completes, the broker preserves the overall oracle data guard protection mode as part of the switchover process by keeping the protection. Oracle 10g data guard quick switchover with physical. Oracle data guard concepts and administration 10g release 2 10. Dataguard switchover on oracle 11gr2 rac database using. See using far sync instances in oracle data guard concepts and administration for examples of how to set.
Primary database may need downtime for many reasons like os upgradation, hardwares upgradation and for many other issues. Run the dgmgrl command line utility from either the primary or standby db system and connect to the primary database using sys credentials. This installation includes dgmgrl and the oracle enterprise manager agent, allowing you to manage the. During switchover, the primary and standby must be able to communicate directly with each other and perform the switchover role transition steps oblivious of the far sync instances. Switchover to physical standby database in oracle 11g once the standby database is configured and works fine then we can switchover to standby database for testing purpose to reduce the primary database downtime. Dgmgrl is being used to manage the data guard configuration and broker. Oracle cloud infrastructure database service version na and later information in this document applies to any platform. Using switchover operation we can convert physical standby database to primary and primary database to physical standby database in oracle. You may create an observer a single one for each broker configuration and you can also use the fast start failover feature with the data guard broker. The mrp process will be shut down automatically by the switchover command when executed at the target standby database. Oracle 11g data guard switchover and switchback data. Dear 804719, there is nothing wrong with the scripts so you may use the manual procedures and scripts to install the data guard. With oracle database 11g release 2, it no longer stops leaving all bystander standby databases still ready to apply redo from the new primary database without having to be restarted. Using realworld examples and handson tasks, oracle data guard 11gr2 administration beginners guide will give you a solid foundation in oracle data guard.
Data guard is oracle 12cs true disaster protection technology. A manual failover is user initiated and involves performing a series of steps to. Oracle 11g to 12c database upgrade with data guard. If this statement completes without any errors, proceed to step 3. Manual switchover standby database switchover is a process of dataguard whether we can switch roles of a primary database to standby and a standby database to primary at runtime without loss of data and viceversa can also be done after performing another switchover. Grid control 11g and the latest cloud control 12c handle standby database. Performing switchover in 11gr2 standby steps dba tutorials. Allows the primary database to switch roles with one of its standby databases. Switchover and failover operations oracle help center. How to setup active dataguard in oracle 11g shivananda rao. Oracle 11g data guard switchoverfailover quick stepby. Oraclebase data guard physical standby setup using the. These tools are available for download on the internet. Oracle 11g to 12c database upgrade with data guard and asm 4.
Data guard helps you change the role of a database using either a switchover or a failover. Manual switchover without dataguard in oracle dbametrix. Oracle 11g physical standby data guard failover steps. Gracefully stop application processing against the database or disconnect all sessions possible using the. It has been designed to teach you everything you need to know to successfully create and operate data guard environments with maximum flexibility, compatibility, and effectiveness. A oracle instance in a data guard configuration is created and maintained to transition into the role of the primary database in case of an emergency. Verify switchover operation a successful switchover operation will initiate transmission of redo data from the new primary database to standby databases, including the original primary database in the data guard configuration. Dataguard switchover on oracle 11gr2 rac database using physical standby a primary rac database that is running normally, the switchover operation must start from the primary site.
The status of the new database is creation in process. Article i had written previously was the creation standby database with rman active database duplication. This article describes the creation of a standby database using oracle database 11g release 2 and the oracle grid control. After configuring data guard, databases would be either primary and standby database role, and we can altered these roles without loss of data or without resetting logs called switchover. However, no additional data is applied on the standby database once you. These steps describe how to perform a switchover to a physical standby database. Oracle data guard with oracle database 11g release 2. First of all, the data guard broker is required if you would like to administer your databases in oracle cloud control. A switchover is a role reversal between the primary database and one of its standby databases.
Oracle data guard 11gr2 administration beginners guide. In addition to a disaster recovery situation, the dba may want to transition a oracle instance into the primary role in order to perform certain types of maintenance activities on the original. How to setup active dataguard in oracle 11g the main advantage of setting up dataguard in 11g is that the database can be opened in readonly mode allowing the users to access the physical standby database for fetching reports and on the same time. Data guard is the name for oracles standby database solution, used for disaster recovery and high availability. You had to download oracle data guard separately from the oracle. Oracle data guard helps you change the role of databases between primary and standby using either a switchover or failover operation. Before performing switch over, kindly verify the state of data guard on both the instances by following sql queries. During a switchover, the primary database transitions to a standby role and the standby database transitions to the continue reading. Hi, i will explain you to perform switchover in oracle dataguard in this article. About author hailie jiao works as oracle dba at baltimore, maryland. December 30, 2016 july 4, 2019 mehmet salih deveci 0.
In it, you have a minimum of two databases, primary and standby. Oracle data guard maintains the standby database by transmitting and applying redo data from the primary database. Subsequent sections provide detailed configuration steps for enabling oci and. See using far sync instances in oracle data guard concepts and administration for examples of. This is typically done for planned maintenance of the primary system. The proper configuration of oracle data guard redo apply and sql apply is. Switchover to physical standby database in oracle 11g. Data guard concepts with live demo from dba technologies by prasad mynumpati duration. The first talking about the broker and the second talking about data guard using sqlplus. So, primary database will operate as standby and standby will operate as primary database. Data guard has options for multiple standby sites as well as an activeactive configuration. Oracle database 11g active data guard hands on workshop. Data guard switchover tips burleson oracle consulting. Configuring oracle database 11g with oracle data guard.
Maximum availability architecture oracle data guard 10g release 2 switchover and failover best practices page 4 for information about all of the oracle highavailability solutions and the benefits of faster data guard failover and switchover, refer to the oracle database high availability overview4. Oracle data guard broker and static service registration doc id 87859. I want to mention a new feature about data guard that came with oracle 12c. See oracle data guard concepts and administration for more information on using the alter system flush redo statement. Before reading this article, i recommend that you read the article about data guard configuration and architecture wit. It really depends though on what you are actually trying to do. Oracle database backup service version na and later information in this document applies to any platform. Oracle 11g rac real application cluster kurulumu 2. Using oracle enterprise manager cloud control 12cs oracle data guard setup and. A s witchover is a role reversal between the primary database and one of its standby databases.
This document describes how to setup clients to connect to data guard databases primary and standby and configure automatic client failover such that in case there is role change due to switchover or failover, the client connections should still be valid i. After configuring data guard, databases would be either primary and standby database role, and we can altered these roles without loss of data or without resetting logs. Oracle 11g data guard switchoverfailover quick stepbystep guide assumptions in this sample, it is assumed that you already have your oracle 11g primary database functioning, and have already set up a oracle 11g physical standby database, and can access them using the data guard commandline interface dgmgrl utility. In remote dba services, these type of oracle errors are very critical to manage if you havent access of some commands or not having more knowledge of operating system commands. Clients do not need to know which site they connect to, but data guard broker and database background processes need to connect exactly to foo or bar, a virtual service does not provide that functionality. Oracle data guard supports the following role transitions. The manual switch over steps were tested in oracle 11. Oracle database 11g release 2 data guard setup using oracle grid control. The first answer will disable the broker but will leave all the redo transport and apply in place but if you ever tried to switchover things would not really work correctly afterward. An immediate failover is the fastest type of failover. We are using active data guard for obiee 11g ebs r12 security intergratiom but we are not able to intitialize ebs sessions, so reports are not workingbecuase some of the reports using oracle global temp because global temp tables are for each session and apps security initialize are for only that sessionalso is the obiee scheduling will. Oraclebase oracle database 11g release 2 data guard. After a switchover, each database continues to participate in the data guard configuration with its new role.
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