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Slow DataPump Import (Impdp) Performance using Parallel Option with Pre-created Partitioned Tables (Doc ID 2098931.1)

Last updated on MAY 23, 2023

Applies to:

Oracle Database - Enterprise Edition - Version 12.1.0.2 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.

Symptoms

Partitioned tables have been created prior to the Import with IMPDP and the PARALLEL option is being used but only one of the workers is active and the others are idle resulting in a slow import compared to the export time.

The tables involved will show in the trace:

INSERT /*+ APPEND PARALLEL */


Using "data_options=disable_append_hint" does not change the "Append" hint being used.

Cause

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In this Document
Symptoms
Cause
Solution
References


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