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Oracle Tips by Burleson 

Protection vs. Validation

Through out this section, I have talked about constraints protecting your data.  The job of the constraint is to insure that the data you INSERT/UPDATE meets the requirements set forth in the constraints, to protect your data.  Many users use constraints to validate their data.  Basically, here is a row, throw it at the database and see if it accepts it. 

While this approach works, it has a significant impact on the database performance.  The Oracle database assumes that the data will be accepted.  The database logs the changes in the undo/redo logs, updates the table (and any indexes) before checking the constraints.  If the data fails, all those changes must be undone. 

Why does the database implement constraint checking in this way?  Because, it is the most efficient way for the database to store and protect your data. Your application is responsible for validating the data.  The database catches those pieces of data that the program let slip through, thus providing integrity protection. 

Always validate your data in your application.  Database constraints are there to protect your data. 

Now that we can insure the quality of our data by implementing constraints, we need to look at some of the database objects that allow us to better access that data. 


The above book excerpt is from:

Easy Oracle SQL

Get Started Fast writing SQL Reports with SQL*Plus

ISBN 0-9727513-7-8

John Garmany 

http://www.rampant-books.com/book_2005_1_easy_sql.htm

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