【MOS】Why an Object Not Be Exported? ORA-39166 or ORA-31655 (文檔 ID 2114233.1)

  【MOS】Why Can an Object Not Be Exported? Expdp of SYSTEM User's Table Returns ORA-39166 or ORA-31655 (文檔 ID 2114233.1)  

In this Document

Goal

Solution

References

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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.  

GOAL

This document explains why certain objects cannot be exported, and how to find those objects.

There are certain system generated schemas that are not exportable using exp or expdp because they contain Oracle-managed data and metadata. SYS, MDSYS, and ORDSYS are some examples.

In addition, there are other tables owned by users such as SYS or APEX_040200 which are automatically skipped during export, nor can those be exported intentionally. 

For example, certain tables owned by SYSTEM user like below cannot be exported:

% expdp system/manager directory=my_dir tables='REDO_DB'

Export: Release 12.1.0.2.0 - Production on Thu Mar 3 20:39:27 2016

Copyright (c) 1982, 2014, Oracle and/or its affiliates. All rights reserved.

Connected to: Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Partitioning, OLAP, Advanced Analytics and Real Application Testing options
Starting "SYSTEM"."SYS_EXPORT_TABLE_01": system/******** directory=my_dir tables=REDO_DB
Estimate in progress using BLOCKS method...
Total estimation using BLOCKS method: 0 KB
Processing object type TABLE_EXPORT/TABLE/STATISTICS/MARKER
ORA-39166: Object SYSTEM.REDO_DB was not found or could not be exported or imported.
ORA-31655: no data or metadata objects selected for job
Job "SYSTEM"."SYS_EXPORT_TABLE_01" completed with 2 error(s) at Thu Mar 3 20:39:31 2016 elapsed 0 00:00:03

 

SOLUTION

Objects (tables, views, schemas, etc) which fall under either of below conditions are not exported with expdp because they are regarded as system maintained objects.

• Object is listed in ku_noexp_view. 
  This view is a union of ku_noexp_tab and noexp$ tables. 
  Objects that are listed in this view are not exported.
  
  
• Object is ORACLE_MAINTAINED='Y' in ALL_OBJECTS (and DBA_OBJECTS).

 

REFERENCES

NOTE:1912162.1   - 12.1.0.1 EXPDP Does Not Export APEX Schema  
BUG:17373592   - EXPDP DOES NOT EXPORT APPLICATION EXPRESS OBJECTS CORRECTLY