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Slow DataPump Import (IMPDP) From Tables With Many Subpartitions (Doc ID 867678.1)

Last updated on FEBRUARY 28, 2019

Applies to:

Oracle Database - Enterprise Edition - Version 11.1.0.7 to 11.1.0.7 [Release 11.1]
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
Oracle Database Exadata Express Cloud Service - Version N/A and later
Information in this document applies to any platform.
***Checked for relevance on 04-Jun-2013***

NOTE: In the testcase content below, the user information and metadata used represents fictitious data. Any similarity to actual persons, living or dead, is purely coincidental and not intended in any manner.

Symptoms

DataPump import (IMPDP) is slow during importing a table with many subpartitions (+150 subpartitions)

The most expensive SQL statement is:

SELECT /*+rule*/ SYS_XMLGEN(VALUE(KU$), XMLFORMAT.createFormat2('TABLE_T','7')), KU$.OBJ_NUM
FROM SYS.KU$_PHTABLE_VIEW KU$
WHERE NOT BITAND(KU$.SCHEMA_OBJ.FLAGS, 128)!=0
AND KU$.SCHEMA_OBJ.OWNER_NAME=:SCHEMA1
AND KU$.SCHEMA_OBJ.NAME=:NAME2

Changes

 

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References

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