ORA-22813 ?

Question

Hi,
I've run into an interesting ORA-22813 error. I ran the following SQL aginst an xmltype table.
SQL> select
2 extractValue(value(a), '/GTP/TransmissionSource@ID') TransmissionSourceID,
3 extractValue(value(a), '/GTP/TransmissionSource@Name') TransmissionSourceName,
4 extractValue(value(b), '/Study@ID') StudyID,
5 extractValue(value(b), '/Study@Name') StudyName,
6 extractValue(value(b), '/Study@TransmissionType') StudyTransmissionType,
7 extractValue(value(c), '/Site@ID') SiteID,
8 extractValue(value(d), '/Investigator@ID') InvestigatorID,
9 extractValue(value(d), '/Investigator@Name') InvestigatorName
10 from gtp x,
11 table(xmlsequence(extract(value(x),'/GTP'))) a,
12 table(xmlsequence(extract(value(x),'/GTP/Study'))) b,
13 table(xmlsequence(extract(value(x),'/GTP/Study/Site'))) c,
14 table(xmlsequence(extract(value(x),'/GTP/Study/Site/Investigator'))) d
15 /
select
extractValue(value(a), '/GTP/TransmissionSource@ID') TransmissionSourceID,
extractValue(value(a), '/GTP/TransmissionSource@Name') TransmissionSourceName,
extractValue(value(b), '/Study@ID') StudyID,
extractValue(value(b), '/Study@Name') StudyName,
extractValue(value(b), '/Study@TransmissionType') StudyTransmissionType,
extractValue(value(c), '/Site@ID') SiteID,
extractValue(value(d), '/Investigator@ID') InvestigatorID,
extractValue(value(d), '/Investigator@Name') InvestigatorName
from gtp x,
table(xmlsequence(extract(value(x),'/GTP'))) a,
table(xmlsequence(extract(value(x),'/GTP/Study'))) b,
table(xmlsequence(extract(value(x),'/GTP/Study/Site'))) c,
table(xmlsequence(extract(value(x),'/GTP/Study/Site/Investigator'))) d
ORA-22813: operand value exceeds system limits
SQL>
Not sure how to get around this one? The query was correctly a number of times without any issue.
Also, I've got over ~90 SYS_IOT_OVER_39#### and ~70 SYS_NT+qzhFuERTRio9lfg061upw== bla, bal table objects.
Not sure what these are?
Thanks.

Answer 1

OK
A number of questions. I assume GTP only occurs once per document (eg is the root node), in which case there is no point to 'sequencing' GTP.
I'm assuming that Study can occur more than once with GTP, and Site more than once within Study and Investigator more than once with Site.
If the above is true the problem may be caused by the way you are constructing your sequences. XMLSequence relies on a correlated join. Hence each level of nesting should be obtained as a subset of the previous level. In your case you are creating a cartesian product which may explain the error...
Try the following
select
extractValue(value(x), '/GTP/TransmissionSource@ID') TransmissionSourceID,
extractValue(value(x), '/GTP/TransmissionSource@Name') TransmissionSourceName,
extractValue(value(study), '/Study@ID') StudyID,
extractValue(value(study), '/Study@Name') StudyName,
extractValue(value(study), '/Study@TransmissionType') StudyTransmissionType,
extractValue(value(site), '/Site@ID') SiteID,
extractValue(value(investigator), '/Investigator@ID') InvestigatorID,
extractValue(value(d), '/Investigator@Name') InvestigatorName
from gtp x,
table(xmlsequence(extract(value(x),'/GTP/Study'))) study,
table(xmlsequence(extract(value(study),'/Study/Site'))) site,
table(xmlsequence(extract(value(site),'Site/Investigator'))) investigator
The tables you see imply that you have 70 different collections within your XML Schema.