Better guidance for database developers

Bravo. We need more of these "core app developers talk with kernel devs" sessions. All the popular stack components -- all the parts of MEAN, LAMP, Pythons and Rubys and Erlangs should come bearing "things I wish kernel devs knew about $foo" two-pagers.

Many of the proposed answers -- ie: the sane way to rename() is x,y,z -- could/should be encoded in a battery of tests that supports fault injection.