Heimdallr

Centralized logging and observability is not a new concept. Decades ago, at CompuServe, we had over 1000 machines running BSD/OS, and the idea of visiting each one to check machine health was laughable at best. Indeed, even just pulling the logs back for analysis was just as bad. So on each machine, syslog had lines like the following in the syslog.conf file:

For over a decade, I have had a rack of servers which I have used for both personal and work related tasks. Indeed, here is a picture of my server rack from back in 2007 (with 6U of rack space containing what was at the time around $140K worth of high-end network switches).

Common Table Expressions, or CTEs as they are often called, are an area of SQL which can by some be considered to be no different than magic. This is because few of us use them, and even fewer of us use them regularly enough to make them like the familiar of some powerful wizard in some book. And just like those familiars sometimes do in the books, they can give us great frustration or even turn upon us like some demon or Djinn who has escaped the bounds we thought would control them.