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  Oracle Tips by Burleson

Chapter 1 Oracle Instance Internals Scripts

An example output for our troubled file number 67 is shown below:

OBJECT                          FILE# Num blocks    Touches
-------------------------- ---------- ---------- ----------
DIM_CUSTOMER                       67        589       3955
DIM_PRODUCT                        67        401       1372
DIM_DAILY_CALENDAR                 67         98       1055
DIM_MSA                            67         48         48
DIM_LOCATION                       67          1         39
DIM_HIST_RPTLOC                    67          1         14
DIM_ITEM_LOCATION                  67          1          4

As you can see, it is as we expected, the DIM_CUSTOMER table has the most blocks and the most touches. We have reduced our candidates from 103 down to 6. In 8i and above the tch (or touch) column in the x$bh table tells you how many times a buffer has been touched by a user process. By seeing how many blocks and how many block touches a particular table has for a specific file, we can see the hot objects in that file that may require additional tuning efforts.  Let’s look at the block level storage values for the candidate tables using a select on DBA_TABLES.

table_name,ini_trans, freelists, freelist_groups, chain_cnt
FROM dba_tables

The above text is an excerpt from:

Mike Ault’s Oracle Internals Monitoring & Tuning Scripts

Written by the world's top DBA and author of over 20 Oracle books, Mike Ault shares his secrets for Oracle DBA management scripts.  This handy reference is indispensable for all Oracle professionals who must quickly automate and manage their Oracle databases with scripts.

This stellar book comes complete with an online code depot full of over 200 pre-tested Oracle DBA scripts, and covers all areas of Oracle database administration including data files, tablespace, table and index management scripts.  Based on more than 20 years full-time experience, Mike Ault brings his expertise to the public with this fantastic book.  Your time savings from a single script is worth the price of this great book.

Mike Ault is one of the leading names in Oracle technology.  The author of 20 books and hundreds of articles in national publications, Mike was the first popular Oracle author with his landmark book "Oracle7 Administration and Management".  Mike also wrote several of the "Exam Cram" books, and enjoys a reputation as a leading author and Oracle consultant.

Mike started working with computers in 1979 right out of a stint in the Nuclear Navy. He began working with Oracle in 1990 and has since become a World Renowned Oracle expert (in the words of his publisher anyway!) Mike has written 14 Oracle related books, dozens of articles, and has presented at conferences in Europe and the USA. Mike has two wonderful daughters and is kept out of trouble by his wife of 29 years, Susan.

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