I'm curious what advantages there are in building compression into
the database itself, rather than using filesystem-based compression.
I see ZFS articles[1] discuss how enabling compression
improves performance with ZFS; for Linux, Btrfs has compression
features as well[2]; and on Windows NTFS seems to too.
[1]http://blogs.sun.com/observatory/entry/zfs_compression_a_win_win
[2]http://lwn.net/Articles/305697/