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ORA-30657 External Table Tips

Expert Oracle Database Tips by Burleson Consulting

April 4, 2015

 

Question:  I am trying to insert into an external table and I get the ORA-30657 error.  

What are ways to populate an external table?

Answer:  External tables are usually loaded from external sources such as spreadsheet data (csv format) or rows that are punched into a flat file in column delimited format.  

Limitations on Oracle External Tables  

In Oracle, external tables have several limitations, including:

  •  No support for DML. Oracle external tables are read-only, but the base data can be edited in any text editor.

  •  Poor response for high-volume queries.

Oracle external tables have a processing overhead and are not suitable for large tables.  

You can also use Oracle utilities such as utl_file to write to an external file, which is mapped to an external table.  

The oerr utility shows this for the ORA-30657 error:

ORA-30657:  Operation not supported on external organized table  

Cause: User attempted on operation on an external table which is not supported.  

A
ction: Don't do that!

See these related notes on external tables:

 

 
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