63 lines
2.5 KiB
SQL
63 lines
2.5 KiB
SQL
-- +----------------------------------------------------------------------------+
|
|
-- | Jeffrey M. Hunter |
|
|
-- | jhunter@idevelopment.info |
|
|
-- | www.idevelopment.info |
|
|
-- |----------------------------------------------------------------------------|
|
|
-- | Copyright (c) 1998-2012 Jeffrey M. Hunter. All rights reserved. |
|
|
-- |----------------------------------------------------------------------------|
|
|
-- | DATABASE : Oracle |
|
|
-- | FILE : dba_index_fragmentation.sql |
|
|
-- | CLASS : Database Administration |
|
|
-- | PURPOSE : To ascertain index fragmentation. As a rule of thumb if 10-15% |
|
|
-- | of the table data changes, then you should consider rebuilding |
|
|
-- | the index. |
|
|
-- | NOTE : As with any code, ensure to test this script in a development |
|
|
-- | environment before attempting to run it in production. |
|
|
-- +----------------------------------------------------------------------------+
|
|
|
|
SET ECHO OFF
|
|
SET FEEDBACK OFF
|
|
SET HEADING ON
|
|
SET LINESIZE 180
|
|
SET PAGESIZE 50000
|
|
SET TERMOUT ON
|
|
SET TIMING OFF
|
|
SET TRIMOUT ON
|
|
SET TRIMSPOOL ON
|
|
SET VERIFY OFF
|
|
|
|
CLEAR COLUMNS
|
|
CLEAR BREAKS
|
|
CLEAR COMPUTES
|
|
|
|
PROMPT
|
|
PROMPT +------------------------------------------------------------------------+
|
|
PROMPT | Calculate Index Fragmentation for a Specified Index |
|
|
PROMPT +------------------------------------------------------------------------+
|
|
|
|
PROMPT
|
|
ACCEPT index_name CHAR prompt 'Enter index name [SCHEMA].index_name : '
|
|
|
|
ANALYZE INDEX &index_name VALIDATE STRUCTURE;
|
|
|
|
COLUMN name HEADING 'Index Name' FORMAT a30
|
|
COLUMN del_lf_rows HEADING 'Deleted|Leaf Rows' FORMAT 999,999,999,999,999
|
|
COLUMN lf_rows_used HEADING 'Used|Leaf Rows' FORMAT 999,999,999,999,999
|
|
COLUMN ibadness HEADING '% Deleted|Leaf Rows' FORMAT 999.99999
|
|
|
|
SELECT
|
|
name
|
|
, del_lf_rows
|
|
, lf_rows - del_lf_rows lf_rows_used
|
|
, TO_CHAR( del_lf_rows /(DECODE(lf_rows,0,0.01,lf_rows))*100,'999.99999') ibadness
|
|
FROM index_stats
|
|
/
|
|
|
|
PROMPT
|
|
PROMPT Consider rebuilding any index if % of Deleted Leaf Rows is > 20%
|
|
PROMPT
|
|
|
|
UNDEFINE index_name
|
|
|
|
SET FEEDBACK 6
|