Database load spiked and this has dramatically increased error rates and degraded times on responses. Automatic re-indexing was enabled over the weekend. A re-index of the routes table changed the statistics on the table. This resulted in much less efficient queries there.
Farhan Thawar (VP of Engineering at Shopify) and Ben Orenstein (CEO of Tuple) address common objections to pair programming, how to be a great pair, whether pairing obviates code review, introducing the practice to new teams, and how Shopify is continuing its pairing culture in a digital-first world.
The value of Root Cause Analysis is in the process: Even if you do not identify specific dominoes in your failure cascade that you could remove to protect yourself in the future your investigation may identify things that you can improve.