CTAS Of A Table Is Bigger Than The Actual Size

(Doc ID 1934557.1)

Last updated on SEPTEMBER 01, 2017

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.3 and later
Information in this document applies to any platform.
***Checked for relevance on 01-Sep-2017***

Symptoms

Create Table As Select (CTAS) of a table results in 1.5 times the storage of the actual table.

The following example illustrates the problem:

 

Cause

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