RMAN Recipes for Oracle Database 11g - A Problem-Solution by Darl Kuhn, Sam R. Alapati, Arup Nanda

By Darl Kuhn, Sam R. Alapati, Arup Nanda

This publication was once written by means of professional execs who've been utilizing RMAN since
its inception. they've got famous that RMAN will be complicated, and so they imagine everyone
should no longer need to plow through an identical studying curve that allows you to arrive on the similar conclusions.
So they've got accumulated jointly their top practices and tried-and-true approaches and
compiled them into this excellent book.
If you're an Oracle database administrator, this is able to rather well be the main important
book you learn. know-how books are recognized for changing into shelfware, pristine and unopened
books decorating cabinets all over. This ebook may be the exception—the e-book that's dog-eared
and worn, the canopy falling off and pages smudged, stumbled on extra usually opened face down on a
desk than perched serenely on a shelf. the knowledge inside this booklet is the very essence of
the task of the Oracle DBA, an important aspect of the task, and i'm thankful to Darl, Sam,
and Arup for sharing.

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Oracle uses a “writeahead” protocol, meaning the logs are written to before the datafiles are. Therefore, it is critical to always protect the online logs against loss by ensuring they are multiplexed. Any changes made to the database are first recorded in the redo log buffer, which is part of the SGA. Redo log files come into play when a database instance fails or crashes. Upon restart, the instance will read the redo log files looking for any committed changes that need to be applied to the datafiles.

Ora files, for example) To maintain the database redundancy set described here, you must duplex the control file as well as the online redo log files at the database level. That is, although a mirrored disk setup means that a copy of the redo log files and the control file will be automatically made at the operating system level, that doesn’t provide you with complete safety. Although you can mirror the online redo files at the operating system level, Oracle advises against this. Follow these Oracle best practices for protecting your database files: • Multiplex the online redo log file at the database level.

Make and Protect a Database Redundancy Set You may have to perform a database recovery when you lose or can’t access (because of a media problem) any of these three types of Oracle database files: datafiles, online redo log files, and control files. Oracle recommends that you maintain a database redundancy set, which is a set of files that’ll help you recover any of the three key types of Oracle files when they become unavailable to the database. This essential set of recovery-related files, called the redundancy set, will enable you to recover your database from any contingency.

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