Generated XML gets truncated

Question

Hello,
I have two databases with same structure/tables, but different character-sets.
Database A:
NLS_CHARACTERSET: AL32UTF8
NLS_NCHAR_CHARACTERSET: AL16UTF16
Database B:
NLS_CHARACTERSET: WE8MSWIN1252
NLS_NCHAR_CHARACTERSET: AL16UTF16
This is the only obvious difference between those databases.
Now I am trying to generate a XML-document that contains information about the tables in a schema, using data from user_tab_columns, all_constraints and all_cons_columns. The query looks like this:
SELECT
XMLElement("tables",
     XMLAgg(
          XMLElement("table",
               XMLAttributes(
                    v.TABLE_NAME AS "name"
               XMLAgg(
                    XMLElement("column",
                         XMLAttributes(
                              v.COLUMN_ID AS "id",
                                v.COLUMN_NAME AS "name",
                                v.DATA_TYPE AS "type",
                                v.COL_LENGTH AS "length",
                                v.NULLABLE AS "isNullable"
                         XMLElement("constraints",
                              (SELECT
                                   XMLAgg(
                                        XMLElement("constraint",
                                             XMLAttributes(
                                                 DECODE(uc.constraint_type,
                                                     'P', 'PRIMARY_KEY',
                                                  'R', 'FOREIGN_KEY') AS "type",
                                                  uc2.table_name AS "referencedTable"
                              FROM
                              all_cons_columns ucc,
                              all_constraints uc,
                              all_constraints uc2
                              WHERE ucc.table_name = v.table_name
                              AND ucc.column_name = v.column_name
                              AND ucc.table_name = uc.table_name(+)
                              AND ucc.constraint_name = uc.constraint_name(+)
                              AND uc.r_constraint_name = uc2.constraint_name(+)
                              /* only primary and foreign key constraints */
                              AND uc.constraint_type IN ('P', 'R'))
FROM
  (SELECT uc.TABLE_NAME, uc.COLUMN_ID, uc.COLUMN_NAME, uc.DATA_TYPE,
   (CASE uc.CHAR_LENGTH WHEN 0 THEN uc.DATA_LENGTH ELSE uc.CHAR_LENGTH END) AS COL_LENGTH,
   uc.NULLABLE
   FROM user_tab_columns uc
   ORDER BY uc.TABLE_NAME, uc.COLUMN_ID) v
GROUP BY v.TABLE_NAMERunning the query on database B works perfectly and gives a well-formed XML-document. Running the same query on database A also works BUT it yields a somewhat "truncated" document! For example the output contains the following:
<table name="table1">
... lots of <column>elements ..
</table>
le name="table2">
... many more elements, all correctly fomatted ...So as you can see, the beginning of the <table> tag of the second entry in the document just gets truncated.
And when I add the following condition to "v": WHERE uc.table_name IN('table1', 'table2'), the result from database A does only contain the XML structure for 'table1', in database 2 it correctly gives me the two <table> elements!
It's very weird!
Thanks for any hints!
Database: Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Prod on Linux
I'm connecting via SQL Developer, using JDBC I'm getting the same results.
Edited by: user474106 on 23.06.2009 12:03

Answer 1

Yes, it's the same in SQL*Plus.
I now found out that when I leave out the XMLElement "contraints" (i.e. the query that determines the constraint information), I get at least an element for each table in the resulting document. But of course now the constraint information is missing...
Leaving out the first "XMLAgg" I get a row for each table, which is not exactly what I need, because I want to have a single document. But at least the result ain't truncated ... maybe I should concatenate the single rows as a workaround... any ideas on how to do that? Or should I do this on the client side?
Thanks for your help so far!