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Oracle Tips by Burleson 

Aggregation Denormalization

In Oracle data warehouses, a table might have millions of rows, and SQL queries might take hours to run.  To solve this problem, Oracle has a tool called a materialized view  to pre-summarize data and pre-join table together.

When you pre-summarize data with materialized views, you don’t need to change your SQL!  Oracle has a super-cool feature called query re-write where Oracle will automatically know when your SQL can use a pre-summarized result.

So, I have my data, and I want to start building my database.  How can I visualize my data and go through the normalization process with out constantly recreating the database?  For this, you want to use the Entity Relation Diagram .


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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