UNUSED COLUMNS: Impact of keeping the Columns which are marked UNUSED

(Doc ID 2014424.1)

Last updated on AUGUST 02, 2016

Applies to:

Oracle Database - Enterprise Edition - Version and later
Information in this document applies to any platform.


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?



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