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  Oracle Tips by Burleson

Chapter 6 Oracle Tablespace and File Internals Scripts

only use the default storage for minor tables. Ideally, application developers will estimate the table size requirements.

To avoid fragmentation issues altogether, use the fixed-size extent model for tablespaces. The fixed-size extent model creates initial extent sizes for tablespace objects that are multiples of a fixed default value, and subsequent extent sizes that are equal to the default extent value for the tablespace. With fixed-extent, tablespaces are sized according to the needs of the application, usually a small, medium, and large extent. The fixed-size model permits extents that are released due to table or index maintenance to be used by any other object in the table. By allowing freed-extent reuse, fragmentation is no longer a concern in fixed-extent-size model tablespaces.

In Oracle8i and later releases consider using the locally managed tablespace option that uses a bitmap to control extent allocation and deallocation. The bitmap is located locally to the tablespace thus avoiding the I/O overhead of the dictionary managed tablespace uet$ and fet$ dictionary table operations. The LMT can use auto allocated or uniform allocated extent sizes.

Monitoring Tablespace Autoextend Settings

If the autoextend feature is used, database autoextend status and data file locations should be monitored, in addition to space usage and fragmentation monitoring. dba_file_data.sql shows SQL that will create a view monitoring autoextend data for pre-Oracle8. In pre-Oracle8 versions, the only way to get this information is to query the SYS table FILEXT$, which, unfortunately, looks like this:

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.

See the Oracle script collection::



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