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Why Transport Tablespace Export Dumpfile Is Larger For Datapump Export (EXPDP) Than Traditional Export (EXP) (Doc ID 605053.1)

Last updated on MAY 12, 2021

Applies to:

Oracle Database - Enterprise Edition - Version to [Release 10.1 to 11.1]
Oracle Database Cloud Schema 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
Oracle Database Backup Service - Version N/A and later
Information in this document applies to any platform.


During TTS export you find that the size of the DataPump (expdp) dump file is much larger than that of same export via traditional exp. This seems strange as only metadata is being exported and DataPump by default compresses metadata. (From 10.2 Utilities guide page 2-8 "Parameters Available in Export's Command-Line Mode" COMPRESSION: Default: METADATA_ONLY)


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