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EXPDP And IMPDP Slow Performance In 11gR2 and 12cR1 And Waits On Streams AQ: Enqueue Blocked On Low Memory (Doc ID 1596645.1)

Last updated on OCTOBER 16, 2018

Applies to:

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 Exadata Express Cloud Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Information in this document applies to any platform.

Symptoms

The import with DataPump of tables into an Oracle11g Release 11.2.0.4 database takes almost 45 minutes, while the same import into Oracle10g Release 10.2.0.4 only take 2 minutes.
The slow Import Data Pump performance problem might also reproduce in other Oracle11g Releases (like: 11.2.0.3) or Oracle12c Release 12.1.0.1.
The problem also reproduces when running an Export Data Pump job from such a release database.

The instance was started with following parameters (other configurations also possible):

 sga_target           = 5G
 shared_pool_size     = 0
 shared_pool_reserved_size = 48653926
 large_pool_size      = 0
 java_pool_size       = 0
 streams_pool_size    = 0
 compatible           = "11.2.0.4"
 pga_aggregate_target = 2G
 ...


An SQL trace file was created with:

 

Changes

 

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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