This information will help dbas decide if oracle data guard is the appropriate. This way of role transition where the current primary database starts behaving as a physical standby and on the other hand the current physical standby database starts behaving as a primary database. With the huge growth of data guard it s getting harder to encounter an oracle dba not dealing with data guard. Data guard is the data protection and availability solution for oracle database. Data guard concepts and administration contents oracle. Oracle streams requires oracle10g enterprise edition the least expensive option is the oracle manual. Data guard is an oracle feature that primarily provides database redundancy. Below is basic diagram of data guard physical standby database.
Step configuration of oracle database 10g dataguard. Master oracle data guard 11g provide superior data protection, availability, and disaster recovery using the tested techniques in this oracle press guide. Again this comes back to the installed andor running clause. Oracle data guard 11g r 2 administration beginners guide. Linear scalability, geodistribution and extreme data. Oracle data guard concepts and administration, 11g release 2 11. The best that data guard can do is have the idle server used for read only reporting. The database administrator can initiate the process with just one command. This book covers all aspects of oracle data guard in detail and provides an overview of the latest data guard features in oracle10g. Dataguard is basically the dr solution from oracle which has many other benefits other than being dependent on single point of failure of storage.
Look at joel goodmans introduction into oracle restart, if you never heared of it before. Active data guard provides the management, monitoring, and automation software to create. Maximize database availability using oracle data guard and other technologies. Supports active data guard and oracle goldengate multiple sharding methods consistent hash, list, range or composite centralized schema maintenance native sql for sharded and duplicated tables direct routing and proxy routing online scaleout wauto resharding or scalein oracle database 18csharding features. The name, sid of dg site would be the same like legacy system. There are many use cases for data guard that do not include a dr site, such as a local standby used in the case of a hardware failure of the primary. Creating active dataguard creating logical standby step by step creating physical standby. Oracle data guard concepts and administration oracle docs.
Multiple observers provide an immediate benefit for high availability. Oracle 9i data guard is the new name for oracle 8i standby server, incorporating a large number of new features. Oracle data guard concepts and administration 10g release 2 10. Oracle data guard concepts and administration contents. My data guard test system was built using oracle vm server and oracle enterprise linux with database 10g server templates. The key advantage for logical standby databases is that theyre opened readwrite, even while theyre in applied mode. With faststart failover along with enhancements in oracle database 11g, data guard can failover in a few seconds.
With oracle 12cr2 it is now possible to configure multiple observers within a single oracle data guard broker configuration. Also, it may take up to 30 minutes to recover the server. Data guard is the high availability, disaster recovery and data replication solution for oracle databases. The initial tests i conducted were to use an rman catalog in order to take backups from both the primary and standby databases. Switchover is a two way process in oracle dataguard. Oracle 10g data guardpdf documentation and technical data, shall be subject to the licensing restrictions set forth in the applicable. Oracle data guard disaster recovery for the enterprise page 6 users can perform data manipulation operations on tables in schemas that are not updated from the primary database. In these types of cases, the standby also has to be licensed. The data guard connection process drcx plays a role in transferring data between databases. B1082301 december 2003 this guide describes oracle data guard concepts and helps you implement and manage standby databases to ensure high availability, data protection, and disaster recovery for enterprise data. We can trace the roots of todays data guard as far back as oracle7 in the early 1990s. Data guard physical standby database processes and data. This course will continue to build your skills through learning how to backup an oracle data guard environment, implementing a failover and switchover, and utilizing data guard with flashback database technology as well as. Cowritten by a team of oracle experts, oracle data guard 11g handbook provides a sound architectural foundation along with best practices for configuration, monitoring, maintenance, and troubleshooting.
Also, additional indexes, materialized views and so on can be created. This capability is known as the realtime query feature. Dataguard configuration physical standby database with real time apply. Oracle data guard concept oracle data guard is one of the most effective and comprehensive data availability, data protection and disaster recovery solutions available today for enterprise data. 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. It can also reduce the human intervention required to switch. This made getting a system ready to test pretty straightforward. Oracle data guard with oracle database 11g release 2. Pdf role of oracle active data guard in high availability. Since its a common dba task to provide high availability of databases, data guard is a mustknow topic for every oracle database administrator. The plan is to move all the databases from legacy to new servers using data guard to minimize the downtime. Cowritten by a team of oracle experts, oracle data guard 11g handbook provides a sound architectural foundation along with best practices for configuration, monitoring, maintenance, and. Media recovery was used to apply archived redo logs to a remote standby database, but none of the automation that exists today was present.
This includes redo data generated by the primary database that is not yet available on the standby database and how much redo has. Data guard requires oracle ee, but it automates the failover process to reduce downtime. For more detailed information read the oracle 9i data guard concepts and administration documentation. We use your linkedin profile and activity data to personalize ads and to show you more relevant ads. Oracle active data guard enables readonly access to a physical standby database for queries, sorting, reporting, webbased access, etc. In this course, you will be introduced to oracle database exadata cloud service. Since redo logs are managed for the cdb as a whole, in a data guard configuration for a cdb, redo logs applied at the container level will protect each pdb in it from outages. Expert oracle university instructors will demonstrate how this solution protects your oracle database against planned and unplanned downtimes.
Oracle data guard is the management, monitoring, and automation software infrastructure that creates, maintains, and monitors one or more standby databases to protect. With the active data guard option and realtime query, you can use awr or statspack from the primary database to collect data from a standby database that is. This standby database is maintained by applying the changes from the primary database to it. Data guard provides high availability for a database system. To steal liberally from larry carpenters book on data guard, data guard is a product of more than 15 years of continuous development. Oracle data guard 11gr2 administration beginners guide.
Data guard is not an extra cost option, but you do have to pay for a full oracle license at the standby node. Data guard provides a comprehensive set of services that create, maintain, manage, and monitor one or more standby databases to enable production oracle databases to survive disasters and data corruptions. Oracle active data guard capabilities in oracle database 12c put an end to the compromise between data protection, cost, and complexity by using highly functional and active disaster manage. At first, i installed oracle database 11gr2 grid infrastructure for standalone server to get oracle restart, then oracle database 11gr2 software only. In this article i shall only focus on those relevant to the oracle9i database. The following was posted by dg product manager larry carpenter to the otn forums on 1jun2010. Oracle data guard concepts and administration 11g release 2 11. This training covers the differences between the physical and logical databases and the overall architecture of data guard. I maintain two physical standby databases in maxperformance mode. All the buffer cache locks exclusive locks that are required for the transaction are acquired.
Let us understand how the data flows in data guard setup as described above by points 1 to 8 point 1 on primary database, transactions starts. It provides the management, monitoring, and automation software. Since it s a common dba task to provide high availability of databases, data guard is a mustknow topic for every oracle. Pdf data guard is one of the high availability, disaster recovery and data protection architecture from oracle. It includes basic information on standby databases. It is not a download or an addon and with the excpetion of active data guard fully included, as of this writing, in the basic ee license. This is done by having a standby physical copy database, preferably in another location and on separate disk. Data guard, broker, observer and switchover, step by step. A physical standby database can be opened for readonly access and used to offload queries from a primary database. Low cost methods of implementing zerodata loss dr protection across any distance.
That is, they can be used to generate reports and the like. Failover works great, but the procedure for reinstating the former prime database after repair differs depending upon whether the immediate qualifier is used with the failover command. About rman file management in a data guard configuration. In addition, if a license for the oracle active data guard option has been purchased, a physical standby database can also be open while redo apply is active. While monitoring such an environment, dbas should be knowledgeable of the companys rpo and ensure that there is no data loss should the production database fail due to corruptions, system failures, storage. Changes in this release for oracle data guard concepts and. Changes in this release for oracle data guard concepts and administration changes in oracle database 12c release 2 12. Oracle dataguard oracle database internal mechanism. Active data guard is a new option for oracle database 11g enterprise edition. Active data guard is licensed option to the oracle database enterprise edition and enables advanced capabilities that extend the basic data guard functionality. Physical standby data guard useful sql scripts expert oracle. If one observer fails, there are additional observers that can continue to monitor the status of the configuration.
Data guard manages one or more synchronized copies of a primary database by sending and applying redo logs from primary to standbys. Quick guide to configuring oracle 11gr2 data guard. Oracle active data guard is the most comprehensive solution available to. Overview of oracle data guard oracle data guard is the management, monitoring, and automation software infrastructure that creates, maintains, and monitors one or more standby databases to protect enterprise data from failures, disasters, errors, and data corruptions. Oracle d ata guard ensures high availability, data protection, and disaster recovery for enterprise data. This chapter provides an overview of oracle data guard technology. The data guard broker subsystem can aid in the setup, management and monitoring of data guard configurations. Realtime query and dml offload uses the standby database for queries, reports and occasional updates without impacting protection of the primary automatic block repair provides an automatic and user. Data guard for disaster recovery burleson oracle consulting. Switchover in 12c is still the same, but new features have been incorporated and. Oracle confidential flashback time navigation yflashback query query all data at point in time yflashback versions query see all versions of a row between two times see transactions that changed the row yflashback transaction query see all changes made by a transaction tx 1 tx 2 tx 3 select from emp as of 2.
Data guard is a technology built into enterprise edition. Just a suggestion go over a step by step applying a patch or patch set to a dataguard systems. Once it will be validated by consumers, we will cut off replication to. Data guard administration ed 1 training teaches you how to use oracle data guard. Oracle database online documentation 11g release 2 11. Ideally, data guard provides a combined solution for the problem of high availability and disaster recovery without compromising performance. Oracle licensing for dr house of brick technologies. Oracle data guard in oracle database 10g disaster recovery. Written by a working oracle dba, this text covers the concepts and the architecture of standby databases and provides a detailed description of the implementation and management of data guard. I use the data guard broker command line interface. Using realworld examples and handson tasks, oracle data guard 11gr2 administration beginners guide will give you a solid foundation in oracle data guard.
Proactive monitoring of an oracle data guard environment involves monitoring both the primary and all associated standby databases. Oracle data guard on amazon ec2 configuration guide data guard configuration oracle data guard is the key high availability ha and disaster recovery dr solution for the oracle database. Oracle data guard 11g r2 beginners administration guide is a practical guide that provides all the information you will need to configure and maintain data guard. However, there are other supported alternatives available which are not mentioned in this document.
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