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  Oracle Tips by Burleson

True story

A user wanted to change a rate for one department.  He created and ran his update statement, but he did not use a WHERE clause to limit the changes to the one department.  All rows where changed.  He realized his mistake, knowing that he did not want to commit the incorrect changes; he instead logged off to go get the DBA to help him.  His log off committed the bad data and the company had to restore the previous night’s backup and recover the database forward to a time before the user made his changes. 

A rollback is issued whenever a user issues the rollback command, abnormally exits the database or the database crashes. 

Once a commit has been issued, all changes are permanent.  The previous state of the data is permanently lost.  Other users will see the committed changes.   

Once a rollback has been issued, the changes are undone back to the last commit, rollback or log on.  All of the changes are lost (no roll forward). 


The above book excerpt is from:

Easy Oracle SQL

Get Started Fast writing SQL Reports with SQL*Plus

ISBN 0-9727513-7-8

Col. John Garmany


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