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Chapter 7 Oracle Storage and Object Internal Scripting  

inline with other data if less than 4000 bytes in length or in a special form of storage known as LOB storage if greater than 4000 bytes in length. In most operating systems LOBs can be up to 4 gigabytes in length if stored out-of-line using LOB storage.

However, in order to ensure that proper parameters have been used to set up the LOBs and LOB storage in your database you must use two basic DBA views:

DBA_SEGMENTS - Information on lob segments used in the database
DBA_LOBS - Information on lob storage areas.

An example report to show all lob segments not owned by SYS or SYSTEM and several other default Oracle users is shown below. You need to monitor LOB segments to be sure that:

1. The aren't collocated with base tables
2. They don't have excessive extents

These two items will prevent excessive IO causing hot blocking in your base tablespace. Poor (read:default) settings for LOB storage clauses will lead to bad LOB performance, always tune LOB storage. Always provide a LOB storage clause for any table using lobs in case the lob size exceeds 4000 bytes.

Lob_seg.sql

--**********************************************
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--   Copyright © 2003 by Rampant TechPress Inc.


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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