The slow log ranks by individual duration, so a query taking two seconds once appears above one taking forty milliseconds two hundred thousand times. Ranking by total time…
Testing that a controller queued something by starting a worker is slow and flaky; testing it by reading the queue table couples the test to the driver. Splitting…
Managing authorized_keys across thirty servers means a configuration run to add a colleague and another to remove one, and the removal is the one that gets forgotten. Access…
Squashing two hundred migrations into a schema dump takes forty seconds off every test run, and it introduces a second source of truth that has to be kept…
A compose file with variable substitution, an override and an anchor is not readable by inspection, and the gap between what you think it says and what it…
The replica was up, accepting connections and serving data from an hour ago. Seconds_Behind_Master reported zero, honestly, and was measuring the wrong thing.
EXPLAIN shows the plan and the optimiser’s estimates, and the estimates are frequently wrong — a query planned for 40 rows that reads 400,000 looks entirely healthy. The…
WordPress had no concept of an environment, so every site invented one — and the versions differed enough that a shared plugin could not rely on any of…