Oracle Database Instance Recovery Tutorial

Is It Possible to Corrupt an Oracle Database?

No, You Cannot – Not If It Is Properly Administered

Why? Because the mechanism of redo and undo is the best yet developed on this planet.

In this tutorial, Oracle Certified Master John Watson will explain redo, undo, commit, instance recovery and demonstrate why your database can never lose one row of committed data.

Learn what actually happens, in memory and on disc, when DML is issued. John will demonstrate that instance recovery is automatic, and unstoppable.

This is critical and essential knowledge for all Oracle Administrators and DBA students.

Presenter: John Watson, Oracle Certified Master

This free tutorial is segmented into fourteen separate lessons:

  1. Introduction to Oracle Certified Master John Watson and SkillBuilders (1:44)
  2. Tutorial Agenda (2:40)
  3. The Database ACID Test (3:09)
  4. Physical and Logical Corruption (1:37)
  5. Demonstration – What Does Oracle do when DML is Executed? (9:47)
  6. Commit and the Log File Sync Wait Event (1:18)
  7. When Why and How Does Oracle Write to Disk (1:58)
  8. What About Checkpoints? (1:16)
  9. Discussion about COMMIT NOWAIT (3:46)
  10. Lecture – What Oracle Database does when DML is Executed (7:22)
  11. The Oracle Instant Crash Recovery Mechanism (6:24)
  12. Principles to Remember (0:52) (click on video below)
  13. Oracle – The Incorruptible Database (1:54)
  14. Next Steps (0:47)

Date: Jun 4, 2013


NOTE: Some corporate firewalls will not allow videos hosted by YouTube.

Transcript

Principles to Remember

Oracle Instance Recovery Tutorial

 

Module 12 – Principles to Remember

 

>> John:  Undo generates redo, theyíre not opposites. The redo protect all block changes.

 

[pause]

 

Block changes to table blocks, index blocks, undo blocks, all of them.

 

Log writer writing algorithm, remember, itís optimized for safety. Unless you play games with that parameter, a transaction is not committed until the change vectors needed to rebuild it and the change vectors to reverse it in the undo and the redo log. Database writer algorithm optimize the performance – totally unrelated to commit processing. Thatís how we guarantee the ACID test.

 

Copyright SkillBuilders.com 2017

×
Free Online Registration Required

The tutorial session you want to view requires your registering with us.

It’s fast and easy, and totally FREE.

And best of all, once you are registered, you’ll also have access to all the other 100’s of FREE Video Tutorials we offer!

 

×
Podcast
×