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RE: ORA-1578...block corrupted...error is normal...a block...had a NOLOGGING...operation performed against

Mercadante, Thomas F

2005-08-23

Replies:

Jared,

 

You actually are reinforcing my opinion.

 

Yes, we can do what you suggest – just backup the database files that we loaded.  But why do it that way?  Why have a backup policy for the entire database that may say we backup the entire database daily or ever other day, or just the archive logs in between a full backup, and then change the policy to say – oh wait a minute – we are going to just reloaded these two tables so I’m not going to enforce logging but I’ll do a special backup to cover my backside.

 

Why in the world would we want to do business this way?  To save time?

 

I guess at some sites we (DBA’s) may be forced into this position by management.  But I would argue strongly that these practices have a higher chance of data loss than just running things normally.  

 

What does Gartner say is the leading cause of data loss?  Human decisions – not hardware failure.

 

I guess I’m not risk tolerant.

 

Tom

 


From: Jared Still [mailto:jkstill@gmail.com]
Sent: Monday, August 22, 2005 5:05 PM
To: Mercadante, Thomas F (LABOR)
Cc: cmarquez@collegeboard.org; oracle-l@freelists.org
Subject: Re: ORA-1578...block corrupted...error is normal...a block...had a NOLOGGING...operation performed against

 

 

On 8/22/05, Mercadante, Thomas F (LABOR) <Thomas.Mercadante@labor.state.ny.us> wrote:

I was thinking about this whole topic over the weekend.  It just affirms my feeling that using the NOLOGGING option needs to be used judiciously.  And I question how much time we are saving here.


Quite a bit of time actually.  Try timing a bulk load operation with and without logging.

 

If the total time to reload using NOLOGGING and a total backup is less than a reload with LOGGING and no backup, then don't use it.


You don't need a complete database backup, just the datafiles containing the  nologging objects.

 

--
Jared Still
Certifiable Oracle DBA and Part Time Perl Evangelist