Q

Understanding x$tables

When and how should I use x$bh table? I'm actually looking for definitions of several X$tables. Do you have any recommendations for where to look them up?
I use the v$ views on the x$ tables. The Oracle v$bh view shows the contents of the data buffers, as well as the number of blocks for each type of segment in the buffer. This view is primarily useful for indicating the amount of table and index caching in multiple data blocks. Combining the v$bh view with dba_objects and dba_segments provides a block-by-block listing of the data buffer contents and indicates how well the buffers are caching tables and indexes.

I recommend getting a reference poster for the DBA views. Here is my favorite, from UNISYS and Rampant TechPress.

It's free too!

http://www.dba-oracle.com/poster.htm

This was first published in June 2004

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