ACTUALTESTS ORACLE 1Z0-007 EXAMCHEATSHEET V12 10 04

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This is the log sequence number. The first log sequence number for a new database is always 1. As the online redo log groups are written to, the number will increment by one during each log switch operation. So, the next online redo log being written to will be log sequence 2, and so on. During normal database operations, Oracle will open an available online redo log, write redo to it, and then close it once it has filled the online redo log. Once the online redo log has filled, the LGWR process switches to another online redo log group.

These two chapters lay the foundation for all future chapters, and we encourage you to read them carefully and understand the concepts being discussed. If you can understand the concepts and internal workings, then the rest of the book will be a breeze. Contents xxvii Part II is dedicated to setting up RMAN for initial usage. We cover all possible RMAN configuration options. Then, we discuss the integration with a media manager, the layer that allows you to write your backups directly to a tape device.

First, we will look at redo logs in general. Next, we will look at the multiplexing of online redo log groups and the redo log sequence number. Finally, we will address administration of online redo logs. An Overview of Redo Logs Oracle redo logs come in two flavors: ■ Online redo logs ■ Archived redo logs Redo logs are one of the most critical components when restoring and recovering an Oracle database. This is because redo logs store a history of almost everything that happens in your database.

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