Rebuilding only the updated rows in Complex table

Hi Experts,

I am aware that, having the "Check Complex table" feature enabled in a transmit configuration will check for complex table change every single time when the user triggers a transmit (that is assigned to the fore mentioned transmit configuration).

But how exactly this would work?

Let's say, I have a Complex table that has millions of rows and I have made some changes to this table in the back end (Add/modify/delete entries), Now when I trigger a transmit, "Check Complex table" feature will detect the change. But what happens next?

1. The entire table will rebuild?

2. Only the rows which are affected (Added/Modified/Deleted) will be rebuilt?

Also do I need to change the refresh value of this particular complex table in config. panel to "0" in order to make the "Check complex table" feature to work?

Thanks

Madan