Te trouble with this question is that 2 3 things store the data for these tables: data, delta, and log. If I destroy the log when the data is not up to date, there is no way you can recover the date - it's lost. Equally if I destroy the data file when the log doesn't go back to the beginning of history, it's unlikely that I can recover the data (unless of course I have backup). So at least those two table are needed. The data and delta files are updated by a backrground process so that at any time (other than at a checkpoint) they do not represemt the state of teh table.

Or to put it in simple terms, the question and annswer is wrong. Amd this is confirmed in the page referenced in the application!