DataPump Worker (DW) Processes Do Not Work Concurrently To Import Data Into Pre-Created Tables

(Doc ID 2317768.1)

Last updated on OCTOBER 31, 2017

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.4 and later
Information in this document applies to any platform.

Symptoms

When trying to load data in parallel mode using DataPump import (impdp):

In 10g multiple worker processes can concurrently work at the same time.
In 11.2.0.4, we can see multiple work processes can concurrently work to load data if tables have NOT been pre-created, but a different behavior is seen when the tables are pre-created before the import.

Cause

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