Composite average payload size in 11g (11.1.1.4)

Hi All,
Thanks in advance.
I am trying to figure out the average payload size per composite to calculate some statistics.
I have already looked at the dehydration store table XML_DOCUMENT, however, I cannot seem to figure out how it ties to an actual composite instance in the composite_instance table. I can see it when I am in the EM so it has to be in the database somewhere.
Querying the XML_DOCUMENT table:
select document_id , DOCUMENT_TYPE,DBMS_LOB.GETLENGTH(document) a from XML_DOCUMENT
The composite instance table:
select * from composite_instance.
Any help will be very much appreciated.

Hi,
I wrote for you the relations between the tables so you will get the incoming/outgoing data details:
select xd.document_id , xd.DOCUMENT_TYPE,DBMS_LOB.GETLENGTH(xd.document)
from xml_document xd,
instance_payload ip,
composite_instance ci
where xd.document_id = ip.payload_key
and ip.instance_id = ci.id
and ip.instance_type='composite'
and ci.ecid = 'xxxxxxxxxxxxxxxxxxxxx1111112222222333333'
Arik

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