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Insert/Select statement generates error: ORA-00932: inconsistent datatypes: expected CLOB got -

Posted on 2007-04-06
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Last Modified: 2013-12-19
I have a query that looks like this and it works fine.  The Large XML document breaks down into individual rows the way I like it.

SELECT VALUE(p)
   FROM load_pubmed_xml_tmp w,
   TABLE(XMLSEQUENCE(EXTRACT(w.xml_data, '/PubmedArticleSet/*'))) p
   WHERE w.name = 'TW_2007.xml';

But when I try to insert the rows into another table with this statement, I get an error.
insert into load_pubs_xml_tmp (pub)
SELECT VALUE(p)
   FROM load_pubmed_xml_tmp w,
   TABLE(XMLSEQUENCE(EXTRACT(w.xml_data, '/PubmedArticleSet/*'))) p
   WHERE w.name = 'TW_2007.xml';

The Error is: "ORA-00932: inconsistent datatypes: expected CLOB got -"

1. I can't figure out what datatype of "VALUE(p)" is.
2. If "VALUE(p) is not a CLOB, then how can I cast it into a clob?

Thanks,
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Question by:tdsimpso
  • 2
4 Comments
 
LVL 7

Expert Comment

by:gattu007
Comment Utility
the below metalink note may help

Subject:       Ora-00932 inconsistent datatypes: expected BLOB, CLOB got CHAR during export
        Doc ID:       Note:396454.1


Cause

Problem is due to two related bugs, Bug 5566304 and Bug 4886376 currently still being resolved.

If database was created with nls_length_semantics='CHAR' and multibyte character set (eg: AL32UTF8) then export will give these errors or
select * from SYS.KU$_XMLSCHEMA_VIEW; also returns same errors.
Solution

Workarounds:

1. Create database again with NLS_LENGTH_SEMANTICS=byte
After database creation, change NLS_LENGTH_SEMANTICS=CHAR

or try following workaround

2.

1. Deinstall XDB with catnoqm.sql.
Run $ORACLE_HOME/rdbms/admin/catnoqm.sql as sys user

2. Set NLS_LENGTH_SEMANTICS=byte in initsid.ora or alter spfile and reinstall XDB views with catqm.sql
Run following connected as sys user

catqm.sql <XDB_password> <XDB_TS_NAME> <TEMP_TS_NAME>
example

3. Now try the query. It should return proper results this time.

select * from SYS.KU$_XMLSCHEMA_VIEW;

4. If you wish, change NLS_LENGTH_SEMANTICS=char
and restart the database.

select * from SYS.KU$_XMLSCHEMA_VIEW; should still work and export should no longer give the same errors.
References
Bug 4886376 - INVALID SYS.KU$_XMLSCHEMA_VIEW AFTER CREATING DB WITH NLS_CHARSEMANTICS=CHAR
Bug 5566304 - EXPORT FAILS WITH ORA-00932 AFTER CREATING DB WITH NLS_LENGTH_SEMANTICS=CHAR
0
 

Author Comment

by:tdsimpso
Comment Utility
Recreating the database or reinstalling the XDB is not really an option for me.  Additionally, I think these two options are unrelated overkill for my problem.

The following statement performed the results that I expected.  

insert into load_pubs_xml_tmp (pub)
SELECT VALUE(p).getClobVal()
   FROM load_pubmed_xml_tmp w,
   TABLE(XMLSEQUENCE(EXTRACT(w.xml_data, '/PubmedArticleSet/*'))) p
   WHERE w.name = 'TW_2007.xml';

I added the getClobVal().  It appears that VALUE(p) returns an XMLType.

Thanks,
0
 
LVL 3

Accepted Solution

by:
biswaranjan_rath earned 500 total points
Comment Utility
Additional Info;

You can fetch the datatype from the table ALL_TAB_COLUMNS and query against the condition table_name and column_name.

You can also use TO_CLOB() to get the CLOB value.
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Author Comment

by:tdsimpso
Comment Utility
biswaranjan_rath,
I understand the use of TO_CLOB(), but how would fetching the datatype from ALL_TAB_COLUMNS help?  How would I write that?
Thanks,
0

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