My Oracle Support Banner

EXPDP - How to Solve "ORA-01466: unable to read data - table definition has changed" (Doc ID 1902481.1)

Last updated on JULY 28, 2020

Applies to:

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


Export using EXPDP like below is failing for a table with following error.

EXPDP syntax :



The value of SCN supplied to parameter flashback_scn does not correspond to the time of LAST_DDL_TIME from DBA_OBJECTS for the specific table.

A table's DDL may have changed due to a truncate job and LAST_DDL_TIME can end up ahead of the flashback_scn time supplied in the parameter.


To view full details, sign in with your My Oracle Support account.

Don't have a My Oracle Support account? Click to get started!

In this Document

My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts.