Script to investigate a b-tree index structure
(Doc ID 989186.1)
Last updated on JULY 02, 2023
Applies to:
Oracle Database - Enterprise Edition - Version 9.0.1.0 to 12.1.0.2 [Release 9.0.1 to 12.1]Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.
Goal
NOTE: In the images and/or the document content below, the user information and environment data used represents fictitious data from the Oracle sample or bulit-in schema(s), Public Documentation delivered with an Oracle database product or other training material. Any similarity to actual environments, actual persons, living or dead, is purely coincidental and not intended in any manner.
This script will verify the structure of a b-tree index based on the existing table and index statistics. The script calculates the following items:
- Estimate the size the index should be. Optimal packing can be specified
- The index layout
This script keeps a history of the the data gathered in the INDEX_HIST table. This can be useful to prevent a pattern in index rebuilding. The history log can be user defined
Important to note is that this script does not use the 'analyze table ... validate structure' but it relies on the internal function SYS_OP_LBID which is available as of 9i
Before reviewing this script and its suggestions it is highly recommended to review
NOTE 989093.1 - Index Rebuild, the Need vs the Implications
NOTE 989093.1 - Index Rebuild, the Need vs the Implications
Solution
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In this Document
| Goal |
| Solution |
| Requirements |
| Configuring |
| Instructions |
| Script |
| Sample Output |
| References |