DBA Tips Archive for Oracle
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by Michael New, MichaelNew@earthlink.net, Gradation LLC
One of the best ways I have found to resize or recreate online redo log files and keep the current sequence is to perform it online. In this example, we will resize all online redo logs from 100MB to 250MB while the database is running and use SQL*Plus to drop/recreate them in stages.
Before looking at the tasks involved to perform the resize, let's look at the current online redo log groups and their sizes:
Now let's take a look at the steps involved to resize / recreate all online redo log groups:
Make the last redo log CURRENT
Force a log switch until the last redo log is marked "CURRENT" by issuing the following command:
Drop first redo log
After making the last online redo log file the CURRENT one, drop the first online redo log:
Re-create dropped online redo log group
Re-create the dropped redo log group with different size (if desired):
Force another log switch
After re-creating the online redo log group, force a log switch. The online redo log group just created should become the "CURRENT" one:
Loop back to Step 2 until all logs are rebuilt
After re-creating an online redo log group, continue to re-create (or resize) all online redo log groups until all of them are rebuilt.
After rebuilding (resizing) all online redo log groups, here is a snapshot of all physical files:
Jeffrey Hunter is an Oracle Certified Professional, Java Development Certified Professional, Author, and an Oracle ACE. Jeff currently works as a Senior Database Administrator for The DBA Zone, Inc. located in Pittsburgh, Pennsylvania. His work includes advanced performance tuning, Java and PL/SQL programming, developing high availability solutions, capacity planning, database security, and physical / logical database design in a UNIX / Linux server environment. Jeff's other interests include mathematical encryption theory, tutoring advanced mathematics, programming language processors (compilers and interpreters) in Java and C, LDAP, writing web-based database administration tools, and of course Linux. He has been a Sr. Database Administrator and Software Engineer for over 20 years and maintains his own website site at: http://www.iDevelopment.info. Jeff graduated from Stanislaus State University in Turlock, California, with a Bachelor's degree in Computer Science and Mathematics.
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Last modified on
Wednesday, 28-Dec-2011 13:57:14 EST
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