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Datapump Export becomes very slow when exporting Domain Index(es) (Doc ID 2043076.1)

Last updated on APRIL 03, 2020

Applies to:

Oracle Database - Standard Edition - Version 11.2.0.1 to 12.1.0.2 [Release 11.2 to 12.1]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Cloud Service - Version N/A and later
Information in this document applies to any platform.

Symptoms

Data Pump is very slow when exporting Domain Indexes.

With every Domain Index rebuild this is getting slower.

Data Pump Logfile

Processing object type DATABASE_EXPORT/SCHEMA/TABLE/INDEX/DOMAIN_INDEX/INDEX
. . exported "<SCHEMA_NAME>"."<TABLE_NAME>"                         57.34 MB    1920 rows


TKPROF

TKPROF based on SQL tracing using "event 10046 level 12" confirms that that most of the elapsed time is spent on SYS.KU$_2NDTAB_INFO_VIEW

-- Example

 

AWR Report

The AWR Report confirms that there's a huge number of "executions" of the identical sql_id as confirmed by the TKPROF report.

 

Changes

 

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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