Here is a sample query

SELECT ((sum(dataLength(i.Image))/1024)/1024) as TotMBytes
FROM [SDISTORE100].dbo.Images1 i

The sample query is a small subset of a much larger set of queries where I write multiple records to a table where my TotMBytes is already BigInt. Once, I run my set of queries against all my DBs (120 this time), I want to sum the TotBytes.