Quantifying Abnormal Behavior
06/25/13 At Velocity last week, I spoke about how we quantify abnormality in a system’s time-series metrics cheaply, in realtime, at high frequency. Note that this is not the same …
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Replacing Clever Code with Unremarkable Code in Go
06/04/13 Not too long ago, my primary programming language was Perl. I’ve written a lot of Perl, including some things that I think are quite clever. And therein lies the problem. …
How Does Adaptive Fault Detection Work? Does It Eliminate Thresholds?
04/17/13 In previous posts, I claimed that thresholds are a root of much evil in monitoring systems (not the root of all evil, but a root of much evil), and that we’ve developed th…
Using Socat to Simulate Networking Traffic to Test and Debug
04/15/13 If you don’t know socat, you probably should. From its man: Socat is a command line based utility that establishes two bidirectional byte streams and transfers data betwee…
Two Reasons Why Threshold-Based Monitoring Is Hopelessly Broken
04/10/13 Why is a threshold-based alert such a disaster? There are two big reasons. Thresholds are always wrong. They’re worse than a broken clock, which is at least right twice a …
A Sure-Fire Recipe For Monitoring Disaster
04/09/13 In this post I’ll tell a story that will feel familiar to anyone who’s ever monitored MySQL. Here’s a recipe for a threshold-based alert that will go horribly wrong, beyon…
Why You Should Almost Never Alert On Thresholds
04/08/13 This post is part of an ongoing series on the best practices for effective and insightful database monitoring. Much of what’s covered in these posts is unintuitive, yet vi…
SQL Server Consolidation, Part 3
12/20/12 I wrote a couple of posts previously on SQL Server consolidation. The first post tried to give insight on some of the problems and associated motivating factors that most …
SQL Server Consolidation, Part 2
12/20/12 Consider for a moment that you have a deck attached to your house. It is one story above ground level and is growing weaker with each passing year. The former homeowner pa…
SQL Server Consolidation, Part 1
12/20/12 I am seeing more than a handful of articles these days regarding SQL Server virtualization and/or consolidation. Lots of companies are coming forward to provide you tools …
Performance Counters for Database Mirroring
12/19/12 We have customers using database mirroring, so I wanted to take some time to write a quick post regarding database mirroring and performance monitoring. Microsoft has publ…
Performance Tuning and Time Invested
12/17/12 I never cared for the phrase “wasted time” when it comes to something like performance tuning. Sure, we all feel that way, especially when we spend hours on something only…