Every schema migration is easy the first time, when the table is empty and the only user is your test
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# POST 2: Reading EXPLAIN A query that ran in 20 milliseconds yesterday takes 40 seconds today. Nothing in the
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Every PostgreSQL developer knows the four isolation levels from the SQL standard: Read Uncommitted, Read Committed, Repeatable Read, Serializable. Fewer
Continue readingPostgreSQL Isolation Levels: What Repeatable Read Actually Guarantees
PostgreSQL takes an ACCESS EXCLUSIVE lock for most ALTER TABLE operations. That lock conflicts with everything — reads, writes, even
Every UPDATE in PostgreSQL is secretly an INSERT-plus-a-tombstone. The old row version stays on disk, fully readable to any transaction
Continue readingMVCC and VACUUM in PostgreSQL: Dead Tuples, Autovacuum Tuning, and What PG18 Changed
Every slow query investigation eventually reaches the same moment: you run EXPLAIN ANALYZE, and the plan makes no sense. Postgres
Continue readingReading EXPLAIN ANALYZE: Why Postgres Ignores Your Index
PostgreSQL versus MySQL is one of the oldest rivalries in software, and like most old rivalries it is mostly narrated
Continue readingPostgreSQL vs MySQL in 2026: A Practitioner’s Comparison
Most applications don’t need a database server. They need durable, queryable state — and somewhere along the way the industry
Continue readingSQLite in Production: The Database You Already Ship
Every reporting query has a moment where GROUP BY stops being enough. You need the aggregate and the row it
The data lakehouse has gone from contested idea to default architecture in just a few years, and the table format
Continue readingApache Iceberg vs Delta Lake vs Hudi: Choosing Your Lakehouse Table Format