Retrieve Payload Size From SOA Suite 12c

Hi,

How do we retreive the Size of Payload from SOA_INFRA.

Was using the query below:

ELECT A.DOCUMENT FROM XML_DOCUMENT A,INSTANCE_PAYLOAD B,COMPOSITE_INSTANCE C 

WHERE A.DOCUMENT_ID = B.PAYLOAD_KEY 

AND B.INSTANCE_ID = C.ID 

AND B.INSTANCE_TYPE='COMPOSITE' 

AND A.DOCUMENT_TYPE = 2 

AND B.INSTANCE_ID = <<InstanceNumber>>;  

can see that COMPOSITE_INSTANCE and INSTANCE_PAYLOAD has no records.

Please provide the query for SOA 12c.

Thanks,

Rabin