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Oracle Database 12c Release 2 Performance Tuning Tips & Techniques by Richard Niemiec

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CHAPTER

13

The X$ Tables and Internals Topics (Advanced DBA)

Why do people climb mountains? Because they are there! Why do people open the hood of their car and look at what’s inside? Because they can! Why do DBAs look at the X$ tables? Because they are there and they can!

Oracle now has 1312 X$ tables in 12cR2 (there were 945 in 11gR2), and they are the last frontier for the expert DBA to explore and analyze the deepest cavern of the Oracle database. Querying the X$ tables can give secrets to undocumented features and parameters, information about future Oracle versions, and shorter or faster routes to database information. The X$ tables are ...

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