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Catch Lost Updates Before Release: A Two-Client PostgreSQL Test on Windows

Tue, 27 Oct 2026 15:07:00 +0000

Two successful reservations of three units should reduce stock from ten to four. A read-calculate-write operation can instead leave seven: both clients overwrite the row with a value calculated from an earlier read. That mismatch is what this lab checks. The release check is an invariant:

text
final stock =
 starting stock -
 3 × committed reservations

Keep that assertion beside a controlled two-client test before releasing reservation code. The lab uses one inventory row at READ COMMITTED, so the stock change is easy to compare with committed reservations. Multi-SKU transactions, request idempotency, and Serializable retries need separate tests. This lab measures no throughput.

Prove the Backup: A Percona Distribution for PostgreSQL Restore Drill on Windows

Mon, 14 Sep 2026 11:00:00 +0000

A backup is only useful if it can be restored. This lab seeds a source database, takes a logical archive, deliberately deletes the source database, restores into a clean target, and checks the recovered state. Percona Distribution for PostgreSQL does not provide a native Windows package. Windows is only the Docker Desktop host; PostgreSQL and its utilities run in Linux containers.

The current Percona 17 Docker documentation uses percona/percona-distribution-postgresql:17.11, requires POSTGRES_PASSWORD, and exposes PostgreSQL on container port 5432. Docker Desktop is the recommended way to obtain Docker Engine, the CLI, and Compose on Windows. Percona Docker guide · Docker Compose installation