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UNUSED COLUMNS: Impact of keeping the Columns which are marked UNUSED (Doc ID 2014424.1)

Last updated on APRIL 04, 2019

Applies to:

Oracle Database - Enterprise Edition - Version 10.2.0.1 and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Information in this document applies to any platform.

Goal

To explain the purpose of UNUSED columns, Is there any issue if you leave the UNUSED columns in the database without dropping them.

To answer questions on UNUSED columns like

Can we leave the UNUSED columns as it is? What is the impact of keeping the Columns which are marked UNUSED? Can we make UNUSED column as USED column again? How to restore or recover or revert the UNUSED column data?

 

Solution

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In this Document
Goal
Solution
 Marking Columns Unused
References

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