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Note: this article covers simple compression. Oracle introduced in version 11g release 2 a new feature called Advanced Compression which is not covered here.
General principle of Oracle compression
Oracle compression is a way of reducing the d…
How to Unravel a Tricky Query
If you browse through the Oracle zones or any of the other database-related zones you'll come across some complicated solutions and sometimes you'll just have to wonder how anyone came up with them. …