@CJ
Or regarding the copy, there’s no counter for that.
You can use a debugger for that, create a block with two rows with values ADBCDEF and GHIJKLM in them.
Then run a query which selects only one of them and suspend the process when row is about to be returned (network call).
And then scan through the process private memory with debugger to see whether the row you selected is there in process private mem and whether the other row in that block is not.