I did this subject back in 1988 (not 2015 as I say below). It was great then; taught by (now) Professor John Zeleznikow, Victoria University. Lots of formal stuff related to B+ Trees, ISAM file structures and the like. Really good and important core knowledge upon which to build one's understanding of computer science. If it is anywhere near as good today as it was forty years ago, you should definitely do it; you won't be disappointed!