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EXPDP and undo_retention

edited Aug 18, 2017 5:02AM in Database Utilities (MOSC) 4 commentsAnswered

The EXPDP of 11g (11.2.0.4) database consistently fails with following error messages:

ORA-31693: Table data object "FILE_ATTACHMENTS" 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 10 with name "_SYSSMU10_34386439879$" too small

Master table "SYS"."SYS_EXPORT_FULL_06" successfully loaded/unloaded

The table causing the error found out to be of size 549GB. I tried to follow changes based on technical resources and Oracle support suggestions.

The storage parameters of BLOB column was using PCTVERSION and it was set to a default value of 10. UNDO tablespace is of size 7G with AUTOEXTEND ON and Max Size set to UNLIMITED. As Oracle support suggested, I raised UNDO_RETENTION from default 900 to 2200. I also modified storage parameter for BLOB column from PCTVERSION to RETENTION (11g feature) and set to Oracle recommended value, 2200. I tried to increase PCTVERSION to a higher number but it didn't help either.

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