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DataPump Export (EXPDP) For A Large Table Fails With Error ORA-1555 (Doc ID 1086414.1)

Last updated on DECEMBER 27, 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 Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Information in this document applies to any platform.


Running an expdp on a certain table usually takes an hour. However, it now runs for over a day. The problem appears to be with one table (the largest in the database).

When the DataPump export (expdp) is started, the first table that it processes has an estimated process time of over 24hrs.

ORA-31693 : Table data object "<SCHEMA_NAME>"."<MVIEW_NAME>" failed to load/unload and is being skipped due to error:
ORA-02354 : error in exporting/importing data
ORA-01555 : snapshot too old: rollback segment number 1 with name "_SYSSMU1$" too small

The table does not have any LOB columns. Increasing the UNDO_RETENTION parameter did not help.

When the same export runs from another server, it shows the elapsed time for the same table as around 20 minutes.


Most of the rows in the table were recently updated.


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