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Don Burleson Blog 







  ORA-20011: Approximate NDV failed: ORA-29913 tips

Oracle Database Tips by Donald BurlesonMarch 29, 2015

Question:  I am getting the error "ORA-20011: Approximate NDV failed: ORA-29913". 

GATHER_STATS_JOB encountered errors. Check the trace file.
Errors in file c:\oracle\admin\diag\rdbms\trace\ri_j000_10912.trc:
ORA-20011: Approximate NDV failed: ORA-29913: error in executing ODCIEXTTABLEOPEN callout
ORA-29400: data cartridge error

How do I address these errors?

Answer:  This is a well-know Oracle issue with several solution documents on MOSC ( .  The ORA-20011 error is a custom error.  The ORA-29913 error is also not meaningful:

ORA-29913: error in executing string callout.
Cause: The execution of the specified callout caused an error.

Action: Examine the error messages take appropriate action.


First, see MOSC Note 1290722.1, which notes that the solution to this issue is to clean up the orphaned dictionary entries. Different solutions are appropriate dependent on the exact nature of the primary cause and these are outlined in the note.  

Also see Bug number 10327346 titled "DBMS_WORKLOAD_CAPTURE does not drop external tables (causing ORA-20011 from DBMS_STATS)".

Also related are notes 1274653.1,  MOSC Note 10327346.8, and Note 1305127.1.

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