Datapump Expdp Or Impdp Slowdown Due To Frequent Waits On ”Streams AQ: Enqueue Blocked On Low Memory"

(Doc ID 2386566.1)

Last updated on APRIL 17, 2018

Applies to:

Oracle Database - Enterprise Edition - Version 12.1.0.2 and later
Oracle Database - Standard Edition - Version 12.1.0.2 and later
Information in this document applies to any platform.

Symptoms

Datapump export and import (expdp and impdp) may encounter sudden severe slowdowns due to DW and DM processes frequently waiting on "StreamsAQ: enqueue blocked on low memory".

Following is an example symptom from an expdp logtime=all command. 
Exporting an empty partitioned table takes 0-3 seconds to export each partition, which normally takes less than a second to export.

 

 

 

Cause

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