[da_chicken]

That's quite expensive. Most systems that need this sort of data will instead implement some form of audit log or audit table. Which is still quite expensive.

At the record level, I've seldom seen more than an add timestamp, and add user id, a last change timestamp, and a last change user id. Even then, it covers any change to the whole row, not every field. It's still relatively expensive.

[rbanffy]

> Which is still quite expensive.

OTOH, if they managed to do that in an efficient way, they have something really interesting.

[da_chicken]

Writing to disk is never free.