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CTAS OR INSERT SELECT TAKES EXCESSIVE TIME COMPARED TO STANDALONE SELECT (Doc ID 268294.1)

Last updated on MAY 15, 2020

Applies to:

Oracle Database - Enterprise Edition - Version 8.1.7.4 and later
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.

Symptoms

-- Insert as select and Create table as select on views is slow.
-- Select statement contains GROUP BY clause.
-- Standalone Select works fast.

Changes

 

Cause

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