By Darl Kuhn, Sam R. Alapati, Arup Nanda
It’s occasionally stated that the genuine activity of an Oracle database administrator might be summed up in a single, crucial ability: in order to get well your database. There’s a lot knowledge in that assertion. Of every part you're liable for as a database administrator, not anything is extra vital than the knowledge itself. love it or no longer, the fearsome accountability of defending your organization's most crucial info falls squarely upon your shoulders: Lose that facts and your organization may possibly fail. Lose that facts and also you should be out of a task. Scared? try to be. yet there is support. you're not on my own. Oracle specialists Darl Kuhn, Sam Alapati, and Arup Nanda have come jointly during this e-book to teach you the ability of restoration supervisor, or RMAN, that is Oracle's backup and restoration software of selection. RMAN Recipes for Oracle Database 11g is helping you're taking good thing about all that RMAN has to supply by way of delivering easy-to-understand ideas to business-critical backup and restoration operations. this useful advisor: Demystifies the stairs required to guard your enterprise info offers ready-made and step by step suggestions to basic and intricate backup, restoration, and restoration operations Is task-oriented, making it effortless so you might find the answer to urgent backup and restoration difficulties Respects it slow through supplying example-based recommendations, now not never-ending interpreting fabric while the pressure’s on, you do not have time for lengthy discussions of thought. This booklet will get correct to the purpose with speedy and easy-to-read, step by step strategies that may assist you backup and recuperate your facts with self belief. What you’ll learnOracle Database specialists Darl Kuhn, Sam Alapati, and Arup Nanda make it easier to Reliably again up and get better your database utilizing Oracle's restoration supervisor make the most of new Oracle Database 11g beneficial properties akin to the information restoration consultant allow Oracle Database deal with your backup records through the Flash restoration sector Automate backup and restoration initiatives by way of writing scripts Troubleshoot RMAN difficulties and optimize RMAN functionality Interface with a Media administration Layer to control your backup tape library get over the lack of a regulate dossier, lack of an internet redo log, and different (hopefully!) strange occasions Who this booklet is for Oracle database directors chargeable for database backup and restoration operations.
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Additional resources for RMAN Recipes for Oracle Database 11g: A Problem-Solution Approach (Expert's Voice in Oracle)
Physical Database Structures Used in Recovering Data You need to deal with four major physical database structures during a database recovery: • Datafiles • Redo logs (archived and online) • Control files • Undo records In a basic database recovery situation, you’d need to first restore datafiles by using backups (from a past period, of course). Once the restoration of the datafiles is completed, you issue the recover command, which results in the database rolling forward all committed data and thus bringing the database up-to-date.
An online backup, also called a hot or warm backup, is one made while the database instance is still open. By definition, an online backup is always inconsistent. During a recovery, the application of the necessary archived redo logs will make the backup consistent. Thus, you can make online backups of any database you’re operating, and the resulting inconsistent backups can be made consistent with the application of archived redo logs. However, for databases running in noarchivelog mode, open inconsistent backups aren’t recommended.
In addition to the RMAN client, you may use additional optional components to make your backup and recovery strategy robust and easy: The recovery catalog: The target database control file will always store the RMAN repository, which is the set of RMAN-related backup and recovery information. This data is also referred to as RMAN’s metadata. However, it’s smarter to use a dedicated database to store the RMAN repository. You can then create a special schema called the recovery catalog in this dedicated database and have RMAN store its repository in it, thus avoiding the risk of the critical metadata being overwritten when the control file runs out of space.