How is data guard apply process works if primary and secondary database involves oracle rac. Environment server database name production primary 172. This capability is known as the realtime query feature. Jan 09, 2017 oracle active data guard also enables the use of fast incremental backups when offloading backups to a standby database, and can provide additional benefits of high availability and disaster protection against planned or unplanned outages at the production site. Database administrator job growth dbas play an important and responsible role in every companys information technology it department. This chapter provides an overview of oracle data guard technology. Oracle corporation makes data guard available only as a bundled feature included within its enterprise edition of the oracle rdbms. How to merge oracle data database administrators stack. The dba has many services included with oracle data guard for creating, maintaining, managing, and monitoring one or more standby database instances. Data guard physical standby database best practices part.
As to data guard, oracle is slicingoff the functionality as data guard matures. Steps to configure oracle 11g data guard physical standby. Oracle 9i data guard is the new name for oracle 8i standby server, incorporating a large number of new features. Oracle 12c data guard administration course dba genesis. Oracle data guard is an effective and comprehensive method of achieving data availability, data protection, and disaster recovery solution for oracle enterprise databases. Best practices for zero risk, zero downtime database maintenance. See realtime query for more details if a license for the oracle active data guard. The secured, intelligent, highly available database in the cloud enables you to get more value from your data to grow. Oracle d ata guard ensures high availability, data protection, and disaster recovery for enterprise data. Loading data into multiple tables using when condition. These standby databases are maintained as corresponding copies of the production database. Oracle data guard is the management, monitoring, and automation software infrastructure that creates, maintains, and monitors one or more standby databases to protect enterprise.
In this course, you will be introduced to oracle database exadata cloud service. Oracle data guard ensures high availability, data protection, and disaster recovery for enterprise data. A primary database running on a dedicated server and a physical standby database on a separate dedicated server. Oracle data guard concepts and administration, 11g release 2 11. Oracle data guard maintains the standby database by transmitting and applying redo data from the primary database. Oraclebase oracle dba and development articles, scripts. Oracle 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. Since my main domain is oracle data guard, i posted a blog about oracle 12c release 2 new features for active data guard, one of a big new feature i missed is that the internal data guard broker configuration was changed dramatically on 12. These are the changes in oracle data guard concepts and administration for changes in oracle database release 18c, version 18. A d ata guard configuration consists of one production database and one or more standby databases. By activeactive, it means bothall sites are up, running, and accessible. How do you reduplicate a broken physical standby database. They have same structure of tables and different data to each other. The broker also monitors all of the systems within a single data guard configuration.
Oracle dba learn oracle 11g 12c database admin step by step oracle sql tutorial for oracle sql oracle dba interview questions most asked oracle dba interview questions. Oracle dba and development articles, scripts, howtos and forums 8i, 9i, 10g, 11g, 12c, c, 18c, 19c. Disaster recovery a dataguard configuration consists of one primary database and one or more standby database. The data guard broker provides a graphical user interface and a commandline interface to automate management and operational tasks across multiple databases in a data guard configuration. After a failover occurs, the original primary database can no longer participate in the oracle data guard configuration until it is repaired and established as a standby database in the new configuration. There are no restrictions on where the databases are located, provided they can communicate with each other. Oracle data guard concepts and administration, 10 g release 2 10. Standard edition, standard edition one, and enterprise edition. This article gives an example of the setup and administration of data guard using the data guard broker. Learn oracle database data guard administration for oracle 12c r2, manage data guard environment and become oracle dba 4. 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.
A database buffer cache stores the data in memory for quicker access. Data guard physical standby database best practices part 1 oracle data guard is one of the software solutions provided by oracle corporation to maximize high availability of oracle databases. Media recovery was used to apply archived redo logs to a remote standby database, but none of the automation that exists today was present in the product. Is there any inbuilt package available in oracle for. Changes in this release for oracle data guard concepts and. Oracle s revolutionary cloud database is selfdriving, selfsecuring, selfrepairing, and designed to eliminate errorprone manual data management. Master oracle data guard 11g provide superior data protection, availability, and disaster recovery using the tested techniques in this oracle press guide.
These synchronised copy of primary database is known as standby database and it provides data protection from disasters, human errors, server failures or even site failures. That is, if any database in the data guard configuration uses asm, omf, or both, then every database in the configuration should use. It attracts me to experiment to improve the ha features. 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 concepts and administration contents.
Changes in this release for oracle data guard broker changes in oracle database 12c release 1 12. Production on new environment availability 0% 80% 100% 20% 40% 60% risk meter. Most of your applications access the primary database, while the standby database is a transactionally consistent copy of the primary database. Data guard administration, this oracle database 12c. Oracle dba training is one of the most popular oracle training modules that offer its participants unique opportunity in data management. With the huge growth of data guard its getting harder to encounter an oracle dba not dealing with data guard. Mar 22, 2015 you will discover valuable tips and tricks for mastering your oracle database, and you can buy it for 30% off directly from the publisher. May 28, 2016 hi guys today topic is very most important that comes in oracle 11g release 1 snapshot standby, you can open standby in read,write mode in snapshot standby. Data guard is oracle 12cs true disaster protection technology. Dec 28, 2016 introduction to oracle data guard, oracle data guard concepts, a dataguard provide us following as high availability, data protection, and disaster recovery for enterprise data, what is dataguard, what is primary and secondery database, logical standby database, physical standby database. Standard edition does not come with oracle data guard, but for this you could use log shipping controlled through your own cron scripts as a cheap alternative. Following are the different benefits in using oracle data guard feature in your environment. Changes in oracle database release 18c, version 18.
Reducing planned downtime with data guard high level overview 1. The databases in a data guard configuration are connected by oracle net and may be dispersed geographically. Oracle data guard interview questions expert oracle. This information will help dbas decide if oracle data guard is the appropriate. Standby database data guard is slowly and steadily turning out to be my best topicsubject among others in high availability. Last week, i tried to extract data guard commands, and realized it is. Now i want to merge data on db1 with data on db2 with no duplication. Steps to configure oracle 11g data guard physical standby active data guard parti published october 6, 2014 august 25, 2015 by jignesh jethwa here in this article i am going to cover steps by step approach to configure oracle 11g data guard physical standby. A data guard configuration always runs in one of three data protection modes also called as redo transport rules. Oracle active data guard best practices standby for more. A data guard ensures data protection and high availability of data, and a control file records the physical structure of the database. Automatic gap detection and resolution in standby database.
Master oracle 11g data guard video course teaches you how to implement oracle data guard in real time environment. Learn more about oracle dba from this oracle dba tutorial. Also see my notes on far sync instances with active data guard. Top oracle dba interview question and answers for 2020. Tip the standby databases in oracle cloud infrastructure database are physical standbys. Oracle data guard licensing for standby a common use of data guard is to create a standby oracle server as protection against hardware failure. Oracle data guard is the management, monitoring, and automation software infrastructure that creates, maintains, and monitors one or more standby databases to protect. This oracle documentation was created as a support and oracle training reference for use by our dba performance tuning consulting professionals. Create standby at primary dc using compressed backup from dr site. In the oracle open world 2018 event that happened in san francisco last week, from october 22nd to 25th, much has been said about the trends and strategy paths that oracle is taking in both oci and in oracle database. 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. Dec 28, 2009 oracle data guard is one of the most effective and comprehensive data availability, data protection and disaster recovery solutions available today for enterprise data.
We can trace the roots of todays data guard as far back as oracle7 in the early 1990s. Oracle data guard can be organized to maintain standby databases at a secondary site. Each primary oracle rac instance ships its own thread of redo that is merged by the data guard apply process at the standby and applied in scn order to the standby database. Oracle data guard maintains one or many secondary databases as alternatives to the primary production database. Enable faststart failover data guard broker while oracle data guard definitely protects a database when the entire production site is lost via its failover capabilities, its. Oracle maximum availability architecture best practices for. The best upcoming features in oracle database 19c dba. Insertupdatemerge statistics gathered during dml needs to be fast. We provide a 400page detailed pdf book one for windows. Overview oracle data guard known as oracle standby database prior to oracle9i, provides organizations with high availability, data protection, and disaster recovery for enterprise databases with extraordinary ease of use.
Oraclebase data guard physical standby setup using the. To do this, you can use the flashback database feature to recover the failed primary database to a point in time before the failover occurred. 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. Writes are always directed to the primary database reads are directed to the active data guard standby. 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. Oracle 11g data guard switchover and switchback data.
Dont use if you have data guard broker setup data guard broker command edit database primary set statetransportoff. We provides the entire course is designed on the recommendation of. Easily deploy new or move your existing oltp and data warehouse to the cloud. 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. See role transitions involving physical standby databases global temporary tables can now be dynamically created on an oracle active data guard. If the production database becomes unavailable due to planned or unplanned outage, data guard can switch the standby database to the production role, thus minimizing the. Two large 10g databases, total 20tb, were consolidated and migrated to oracle 11gr2 in exadata within 15 hours. The primary database is also backeed up through rman. Jun 18, 2016 data guard can be used with traditional backup, restoration, and cluster techniques to provide a high level of data protection and data availability. On march 16, 2006, the oracle documentation noted that all standby databases had to be fully licensed if they might be used as production. Since its a common dba task to provide high availability of databases, data guard is a mustknow topic for every oracle database administrator. It includes basic information on standby databases. Before performing any operation it is a good idea to make sure everything is working ok. Data guard is the name for oracles standby database solution, used for disaster recovery and high availability.
Data guard for disaster recovery burleson oracle consulting. Oracle rac, asm, data guard training dba university inc. Oracle asm, rac, data guard training dba university inc. Data guard administration ed 1 training teaches you how to use oracle data guard. Alright, today ive fixed one of the problem i was facing from past few days and discovered that i was doing a stupid mistake and that i failed to catch too till the moment i rechecked some parameters in. Oracle recommends that when oracle dba set up oracle automatic storage management asm and oracle managed files omf in a data guard configuration, set it up symmetrically on the primary and standby database. What are the advantages in using oracle data guard. Siebel and active data guard a work in progress currently working on making siebel crm work transparently with active data guard like toplink applications, the solution uses services and connection pools for readonly and readwrite. Upgrade db in dataguard configuration oracle community. Oracle asm, rac and data guard are some advanced options in the oracle database software that help provide high availability and protection of data. Data guard maintains these standby databases as transactionally consistent copies. There is a set of tables that are peers, in that they have a 11 relationship and the pk of table a is the pk in tables x1 to xn. For more detailed information read the oracle 9i data guard concepts and administration documentation.
Active data guard, recovery appliance oracle goldengatefor heterogeneous replication. The oratab file points to the oracle home for oracle database 12c. The standby databases will be always in sync with primary database. Data guard broker switchover in my previous article, we discussed about oracle data guard broker configuration. Oracle active data guard tips oracle consulting, oracle. The redo logs track and store all the changes made to the database. Database administrators stack exchange is a question and answer site for database professionals who wish to improve their database skills and learn from others in the community. Oracle data guard is a technology which helps you protect against planned and unplanned downtime. Oracle data guard provide protection to your production database by maintaining synchronised copy of your primary database. The two databases make an oracle data guard association. In it, you have a minimum of two databases, primary and standby. Im working with a system that, in the most generous terms that i can come up with, has a horrendous data model. Data guard is basically a ship redo and then apply redo, as you know redo is the information needed to recover a database transaction.
Oracle data guard 11g handbook by larry carpenter overdrive. Learn at your convenient time and pace gain onthejob kind of learning experience through high quality oracle data guard videos built by industry experts. The course briefly discuss about the need of oracle data guard, oracle high availability and how to setup oracle data guard. How to solve gaps in oracle data guard apply aodba. Oracle data guard 11g r2 beginners administration guide is a practical guide that. Oracle 12 upgrade on the primary side defer transfer to the standby. You will get full details on implementing deployment architectures to address requirements that extend beyond disaster recovery. Oracle data guard training oracle data guard course enrol.
If you plan to setup physical standby for an existing database without data guard broker, then check out oracle data. Oracle data guard concepts and administration 10g release 2 10. We use the dataguard feature to automatically replicate the primary database to the physical standby database in real time. Ideally, data guard provides a combined solution for the problem of high availability and disaster recovery without compromising performance. You are correct, the oracle web site says that data guard sql apply and redo apply comes as part of 10g enterprise edition ee. If a license for the oracle active data guard option has been purchased, redo apply can be active while the physical standby database is open, thus allowing queries to return results that are identical to what would be returned from the primary database. Learn end to end course content that is similar to instructor led virtualclassroom training. Data guard fast start failover and switchover configuration pdf graceful failover and failback on manual data guard create manual nonautomatic standby db. To keep an overview about my data guard related postings quite many meanwhile. Data guard can be used with traditional backup, restoration, and cluster techniques to provide a high level of data protection and data availability. This book covers all aspects of oracle data guard in detail and provides an overview of the latest data guard features in oracle10g.
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