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Oracle Tips 

by Burleson Consulting

The Data Warehouse Development Life Cycle

Oracle Features for the Data Warehouse
Tablespace Fragmentation

Contrary to popular opinion, tables with noncontiguous extents do not cause performance problems. It is only the row fragmentation that sometimes accompanies discontiguous extents that negatively affects performance. In some studies, a table with discontiguous extents (and no row fragmentation) actually performed faster than a table that was in a single extent.  However, it is often useful to display the amount of free space within the tablespace, and the location of the free space pieces within the tablespace. Listing 8.15 shows two useful script to display free space within a tablespace.  The free_space.sql script needs only to be run once to create a view that is used by the tsfree.sql script which generates the report.

 

Listing 8.15  free_space.sql and tsfree.sql are used together to get a detail tablespace report
 

Rem free_space.sql

rem run this script first, to create the free_space view;

drOP VIEW SYS.FREE_SPACE;

 

CREATE VIEW SYS.FREE_SPACE AS

SELECT TABLESPACE_NAME TABLESPACE,

       FILE_ID,

       COUNT(*) PIECES,

       SUM(BYTES) FREE_BYTES,

       SUM(BLOCKS) FREE_BLOCKS,

       MAX(BYTES) LARGEST_BYTES,

       MAX(BLOCKS) LARGEST_BLKS

FROM   SYS.Remote DBA_FREE_SPACE

GROUP  BY TABLESPACE_NAME, FILE_ID;

 

This is the next script:

 

rem tsfree.sql - Shows all free space within tablespaces.

Prompt be sure that you have run free_space.sql prior to this script

 

clear breaks;

clear computes;

set verify off;

set pagesize 66;

set linesize 79;

set newpage 0;

 

column temp_col new_value spool_file noprint;



This is an excerpt from "High Performance Data Warehousing".

If you like Oracle tuning, you may enjoy the book Oracle Tuning: The Definitive Reference , with over 900 pages of BC's favorite tuning tips & scripts. 

You can buy it directly from the publisher and save 30%, and get instant access to the code depot of Oracle tuning scripts.

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