Problem with ADO

Question

I have defined a view to get the data from an XMLTYPE table into relational form. I have a problem with opening this view with ADO and Delphi 6.
If I define my view like this:
CREATE OR REPLACE VIEW xml_test (versionsnr)
AS SELECT extractValue(value(xml),'/STANDAT/HEADER/@versionsnr')
FROM xmltable xml
I will the an error ORA-03114 when I try to select from the view with ADO. I have no problems when doing the select in sql*plus.
When I define the view like this:
CREATE OR REPLACE VIEW xml_test2 (versionsnr)
AS SELECT extractValue(value(header),'/HEADER/@versionsnr')
FROM xmltable xml,
table(xmlsequence(extract(value(xml),'/STANDAT/HEADER'))) header
,then it works everywhere, but it is significally slower with large amounts of data.
Interestingly enough, if the view contains a minus operator like below, then it also works everywhere.
CREATE OR REPLACE VIEW xml_test3 (versionsnr)
AS
(SELECT extractValue(value(xml),'/STANDAT/HEADER/@versionsnr')
FROM xmltable xml
MINUS
SELECT extractValue(value(xml),'/STANDAT/HEADER/@versionsnr')
FROM xmltablenew xml)
Do you have any experience with this? Is it a bug in ADO?

Answer 1

Viktor,
Have you looked in the Oracle server trace file dump location to see if there are any trace files that correspond with the time/date of your Ora-03114 error.
Secondly, Have you tried to trace your session to see what is happening?