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

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APPENDIX

C

The X$ Tables (DBA)

The X$ tables are usually not mentioned or talked about in many Oracle books or even in the Oracle user community. For this reason, I am including them in this book as one of the few references available (Chapter 13 contains many X$ queries). There are 1312 X$ tables in 12cR2. There were 945 X$ tables in 11gR2 (11.2.0.1.0), 613 X$ tables in 10gR2 (10.2.0.1), and only 394 in Oracle9i Release 2 (9.2.0.1.0). The X$ tables vary in structure and number, depending on the database version and release used. Run the queries on your version of the database to get the number of views and structure for your specific version. ...

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