We can trace the roots of todays data guard as far back as oracle7 in the early 1990s. Written by charles kim, oracle ace and an oracle certified dba. Table 141 describes the views and indicates if a view applies to physical standby databases, logical standby databases, or primary databases. Data guard is the name for oracles standby database solution, used for disaster. Applying data guard for disaster recovery solutions refers to availability level 4. 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. With data guard, this redo data is also transferred to the standby sites and applied to the standby databases, keeping them synchronized with the primary database. Oracle data guard 11gr2 administration beginners guide. Since it s a common dba task to provide high availability of databases, data guard is a mustknow topic for every oracle database administrator. Oracle data guard with oracle database 11g release 2.
Quick guide to configuring oracle 11gr2 data guard physical. Oracle data guard standard edition 11g database world. Learn at your convenient time and pace gain onthejob kind of learning experience through high quality oracle data guard videos built by industry experts. Active data guard is a new option for oracle database 11g enterprise edition. Learn end to end course content that is similar to instructor led virtualclassroom training. Data guard is the name for oracles standby database solution, used for disaster recovery and high availability. 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. For details, please check the oracle data guard concept and administration guide. Pdf data guard is one of the high availability, disaster recovery and data protection. Oracle dba this blog provides the technical support for oracle administration.
Oracle 9i data guard is the new name for oracle 8i standby server, incorporating a large number of new features. Oracle data guard interview questions and answers kits online. Oracle data guard licensing for standby a common use of data guard is to create a standby oracle server as protection against hardware failure. A data guard configuration consists of one production database and one or more standby databases. With appropriately setup data guard operations, dbas can facilitate failovers or switchovers to. With oracle a database user can instruct the database to not log redo e. Data guard physical standby setup in oracle database 11g release 2. Data guard provides high availability for a database system. Oracle data guard is the management, monitoring, and automation software infrastructure that creates, maintains, and monitors one or more standby databases to protect enterprise. Since its a common dba task to provide high availability of databases, data guard is a mustknow topic for every oracle database administrator. Oracle data guard ensures high availability, data protection, and disaster recovery for enterprise data. With 11g oracle has introduced the concept of active data guard with the possibility to query our physical standby database while it is constantly actualized to reflect the state of the primary database but with an extra charge.
Dataguard configuration physical standby database with real time apply. This chapter describes the views that are significant in a data guard environment. Nov 27, 2017 far sync 6 sql 6 datapump 5 errors 5 managment 5 12c 4 active data guard 4 alert. Withing a few minutes, we can complete a failover and have access to the data again. In this article i shall only focus on those relevant to the oracle9i database.
At this point we consider data guard at one physical location. The primary database is used to receive the archived or. Oracle data guard quick reference navin oracle dba. There are no restrictions on where the databases are located, provided they can communicate with each other.
Oct 02, 2012 well, let me summarize some of the oracle database 12c data guard new features from joseph meekss session oracle data guard zerodataloss protection at any distance. Oracle data guard 11g r2 beginners administration guide is a practical guide that. With the huge growth of data guard it s getting harder to encounter an oracle dba not dealing with data guard. Master oracle data guard 11g provide superior data protection, availability, and disaster recovery using the tested techniques in this oracle press guide. Data guard is the name for oracle s standby database solution, used for disaster recovery and high availability. Oracle data guard concepts and administration oracle docs. Sep 05, 20 data guard maintains this transactional consistency using redo data. These standby databases are maintained as corresponding copies of the production database. For more detailed information read the oracle 9i data guard concepts and administration documentation.
Far sync 6 sql 6 datapump 5 errors 5 managment 5 12c 4 active data guard 4 alert. With the huge growth of data guard its getting harder to encounter an oracle dba not dealing with data guard. This graphic shows that redo data can also be sent from the archived redo log files on the primary to standby redo log files on the standby system. Recovery appliance in a data guard deployment v4 oracle. A data guard configuration consists of one primary database and up to nine standby databases. All the buffer cache locks exclusive locks that are required for the transaction are acquired. Oracle database high availability data guard, standby.
This book covers all aspects of oracle data guard in detail and provides an overview of the latest data guard features in oracle10g. Storage level physical corruptions on the primary database do not propagate to the standby database. This really does simplify the process of creating a standby database as well and automates a number of steps in the creation process which were earlier manually performed. The documentation states that the password file must be copied from the primary to the standby sites.
Note that using enterprise manager grid control data guard physical standby can be implemented from the grid control console easily. Oracle data guard provides the benefits of systemlevel, sitelevel, and datalevel protection, resulting in high levels of availability and disaster recovery without loss of data. Oracle data guard concepts and administration 10g release 1 10. The view described in this chapter are a subset of the views that are available for oracle databases. Point 4 and 5 in the above diagram are where redo transport works. Maximize database availability using oracle data guard and other technologies. A standby database provides a safeguard against data corruption and user errors. By default if dbca is used to create a rac database, the password file is created in an asm diskgroup on the primary site. Redo transport services can transmit redo data to local and remote destinations. Table 161 describes the views and indicates if a view applies to physical standby databases, logical standby databases, or primary databases.
Redo transport services also manage the process of resolving any gaps in the archived redo log files due to a network failure. Mar 27, 2014 1 data guard redo transport services to transfer the redo that is generated by the primary database to the standby database. Oracle database administrators guide for information about creating and using server parameter files. B1082301 december 2003 this guide describes oracle data guard concepts and helps you implement and manage standby databases to. Oracle database 12c release 2 new feature create data guard. Displays archive redo log information from the control file, including names of the archived redo log files. Oracle database online documentation 11g release 2 11. It can also reduce the human intervention required to switch. Redo transport services control the automated transfer of redo data from a database destination to one or more destinations. 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. Once created, data guard automatically maintains each standby database by transmitting redo data from the primary database and then applying the. Data guard concepts and administration contents oracle. One of the real nice new features in oracle 12c release 2 12.
Mar 17, 2008 the consequence is that this configuration does not provide the easeofuse, manageability, performance, and disasterrecovery capabilities available with data guard. Jun 24, 20 with the huge growth of data guard it s getting harder to encounter an oracle dba not dealing with data guard. Oracle rac, asm, data guard training dba university inc. Below is basic diagram of data guard physical standby database. Oracle blogs oracle maximum availability architecture blog. Quick guide to configuring oracle 11gr2 data guard. How do you reduplicate a broken physical standby database. Data guard is not an extra cost option, but you do have to pay for a full oracle license at the standby node. On march 16, 2006, the oracle documentation noted that all standby databases had to be fully licensed if they might be used as production. Burleson also served as the editor for the premier book oracle data guard by rampant techpress. Oracle data guard is available only as a feature of oracle database enterprise edition.
Oracle maximum availability architecture maa is oracles best practices blueprint based on proven oracle high availability technologies, expert recommendations and customer experiences. Oracle database high availability data guard, standby, rac. As transactions occur in the primary database, redo data is generated and written to the local redo log files. Using a b ackup copy of the primary database, you can create up to nine standby databases and incorporate them in a data guard configuration. Move files to the standby machine rename data files turn on database guard. Oracle data guard primary database a production database standby database a database that can become the primary database, should the primary fail eor end of redo lwgr log writer process lns log network server orl online redo log rfs remote file server srl standby redo log file sync and async synchronous and asynchronous log. The database administrator can configure data guard to ensure no data loss. Oracle data guard interview questions expert oracle. Using a b ackup copy of the primary database, you can create up to thirty standby databases and incorporate them in a data guard configuration. Technology, first introduced by setting the standby database manually with oracle 7. Protects our production database from disasters, reducing the work load on it and more effective use it. Oracle data guard training oracle data guard course.
Hi guys today topic is very important in data guard logical standby apply all changes using sql apply and opened in read write mode for real application testing. The data guard connection process drcx plays a role in transferring data between databases. Oracle data guard concepts and administration 10g release 2 10. Aug 20, 20 oracle data guard standard edition 11g as you know, oracle enterprise edition is very expensive. So if you already run the enterprise edition, there is no additional licensing involved. Now insert new data in primary database, which will generate the archive log files and then scp the archive logs on standby server and check whether the standby database is working properly by applying the archivelogs manually. Oracle data guard standard edition 11g as you know, oracle enterprise edition is very expensive. 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. Oracle data guard training oracle data guard course enrol. Optional, safer in case of failure backup all datafiles. The transfer of the archived redo files is initiated on the detection of a sequence gap. Oracle active data guard enables readonly access to a physical standby database for queries, sorting, reporting, webbased access, etc. Hello all, i have been asked many times this question here is what oracle says. Data guard maintains standby databases as transactionally consistent copies of the production database.
Beginning with oracle database 11g, a physical standby database can be open readonly while redo apply is active. The data guard broker subsystem can aid in the setup, management and monitoring of data guard configurations. 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. A s tandby database is a transactionally consistent copy of the primary database.
Data guard for dummies doug dallas oracle users group. 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. Data guard maintains this transactional consistency using redo data. Data guard physical standby managing password files in. The lns is unable to keep pace and the log buffer is recycled before the redo can be transmitted to the standby, the lns automatically transitions to reading and sending from the online redo logs. Data guard physical standby managing password files in a rac physical standby doc id 1984091. Data guard physical standby managing password files. Oracle data guard disaster recovery for the enterprise executive overview. You can not open the database for read only to do backups or analytics.
Oracle data guard is the management, monitoring, and automation software infrastructure that creates, maintains, and monitors one or more standby databases to protect. Oracle d ata guard ensures high availability, data protection, and disaster recovery for enterprise data. As users commit transactions at the primary database, oracle generates and writes redo records to a local online log file. On the standby database, log apply services apply the redo data to the standby database from the standby redo log files and archived redo log files. 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. Still, this exercise provide a degree of familiarity with data guard. First, for a physical standby to be an exact copy it must receive redo for the changes made to the primary. Oct 18, 20 data guard redo apply physical standby database has proven to be a popular solution for disaster recovery due to its relative simplicity, high performance, and superior level of data protection. B1082301 december 2003 this guide describes oracle data guard concepts.
Mar 07, 2014 3 data guard determines which log files are required to resynchronize the standby database and immediately begins transmitting them using additional arch processes. The databases in a data guard configuration are connected by oracle net and may be dispersed geographically. 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. Your database is using async transport method and the instance load is at the peak. The enviroment 2 linux servers, oracle distribution 2. Well, let me summarize some of the oracle database 12c data guard new features from joseph meekss session oracle data guard zerodataloss protection at any distance. 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.
Oracle data guard concepts and administration release 2 9. 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. With data guard, the database can not have any active sessions other than the rns agent. We lost our primary data center and we need to get our database up and running as fast as possible. To steal liberally from larry carpenters book on data guard, data guard is a product of more than 15 years of continuous development. Burleson, an acknowledged leader in oracle database administration. 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. Data guard maintains standby databases as transactionally consistent. Data guard, physical standby creation, step by step. Data guard can ensure no data loss, even in the face of unforeseen disasters. Oraclebase data guard physical standby setup in oracle. It is not available with oracle database standard edition.
Oracle data guard concepts and administration, 10 g release 2 10. Apr 25, 2012 with oracle data guard, when maximum protection is used in combination with real time apply, businesses get the benefits of both zero data loss as well as minimal downtime in the event of a disaster and this makes oracle data guard the only solution available today with the best rpo and rto benefits for a business. Jul 22, 2009 master oracle data guard 11g provide superior data protection, availability, and disaster recovery using the tested techniques in this oracle press guide. Data guard physical standby database processes and data flow. Data guard physical standby database processes and data. Jun 22, 2016 the key difference between data guard and active data guard is the state of the target database. Oracle data guard is a high available, data protection, disaster recovery solution. Pdf role of oracle active data guard in high availability. Having an active sessions blocks the rns agent from committing the changes into the. If you are using data guard broker or oem to manage your data guard environment, do not attempt to solve the data guard problem out of data guard broker or oem interfaces, unless it is proved by comprehensive tests for all kinds of possible scenarios an oracle official document explicitly specifies that these kinds of operations. Is such a dr scenario, your physical standby database will become a production environment used by production users to support the business. Author of more than 30 database books, burleson was chosen by oracle press to write five authorized editions, including oracle highperformance sql tuning.
Oracle database 12c release 2 new feature create data. Oracle data guard in oracle database 10g disaster recovery. Oracle data guard can be organized to maintain standby databases at a secondary site. Oracle asm 12c software installation and configuration grid infrast ructure partitioning disks in linux using the fdisk utility. This oracle data guard training course was designed by donald k. The databases in a data guard configuration are connected by oracle net and may. Preparing the primary for data guard you must now do some preparation on your primary database so that it is ready for data guard. The software which oracle corporation markets as oracle data guard forms an extension to. The best that data guard can do is have the idle server used for read only reporting. The goal of maa is to achieve optimal high availability for oracle customers at the lowest cost and complexity. Oracle data guard logical standby database paul baumgartel transcentive, inc. Active data guard provides the management, monitoring, and automation software to create. Oracle data guard is the disaster recovery solution. This article contains an updated version of the 9i physical standby setup method posted here.
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