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  Oracle Tips by Burleson

Chapter 1 Oracle Instance Internals Scripts

Table 2: Block Type and Action List

Generally it is rare to see waits on any of the bitmap statistics, segment statistics , unused or extent statistics. If you do, they are usually a small number and of such short duration that they mean little if anything to over all tuning.

This leaves us with data block waits.

Data Block Waits

Data block waits are caused by a number of conditions:

  • Insufficient freelists or freelist groups
     

  • Bad initrans value
     

  • Bad settings for PCTFREE/PCTUSED (continued rows)
     

  • Too many rows per block
     

  • Unselective indexes
     

  • Right-hand indexes

But how can we determine which object is experiencing which problems? First, we need to find out specifically where the blocks are that are having the problems. This can be found out by using the x$kcbfwait and v$datafile tables in a report that is run from the sys user such as:

Waits_file.sql

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--   Copyright © 2003 by Rampant TechPress Inc.
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--   Free for non-commercial use.
--   For commercial licensing, e-mail info@rampant.cc
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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.


http://www.rampant-books.com/book_2003_2_ault_internals.htm
 

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