Postgres locks in a humid server room

Our Ben Nghe ward lab keeps air conditioning honest. When laptops thermal-throttle during isolation experiments, students learn that "slow" and "blocked" differ.

We replay the phantom read under READ COMMITTED with a theatrical pause. The second paragraph walks through why ORMs sometimes mask retries that amplify lock duration. We refuse to blame the ORM entirely—instead we annotate SQL emitted line by line.

The third paragraph is about notebooks. Analog annotations still beat screenshots for cohorts mixing Vietnamese and English margin notes. We photograph whiteboards with consent and archive them in the private drive, not on the public blog.

Closing, we remind readers that cloud credits are not bundled with tuition. Honesty about cost is part of database adulthood.