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OCP Instructors Guide for Oracle DBA Certification

Chapter 5 - Oracle Database Objects

Checkpoint Not Complete

The log_checkpoint_timeout, log_checkpoint_interval and fast_smart_mttr_target parameters come to the rescue. These parameters can be set to decrease the time of instance recoveries.

It is important to note that these parameters will not reduce the amount of data lost in certain database recovery scenarios.  If a lost or damaged archived or online redo log is required as input to a database recovery, the amount of data lost will be directly proportional to the amount of time that the lost redo log was active.  Since we now know that the size of the archived redo logs determine how long the log will be active, the larger the log the more data loss there will be!

Resizing Redo Logs

Now that we understand how to determine what sizes our redo logs should be, let’s continue our discussion with some information on how to resize them. Before we begin resizing our redo logs, we need to review Oracle recommendations on redo log groups and members.
 


The above text is an excerpt from:


OCP Instructors Guide for Oracle DBA Certification
A Study Guide to Advanced Oracle Certified Professional Database
Administration Techniques

ISBN 0-9744355-3-8

by Christopher T. Foot
 

http://www.rampant-books.com/book_2003_2_OCP_print.htm


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