Postgres Auto-Increment ID Gap Jumping After Rolled Back Transaction
A gap in auto-incrementing IDs after a rolled-back transaction is expected PostgreSQL behavior, not a bug — sequence value generation and transaction rollback...
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Postgres "FATAL: Remaining Connection Slots Are Reserved for Non-Replication Superuser Connections"
This specific error means PostgreSQL has hit its max_connections limit for regular users, but is deliberately still reserving a small number of slots...
Docker Compose Service depends_on Starting Before Database Is Actually Ready
Plain depends_on in Docker Compose only guarantees a dependency container has started — not that the actual service inside it (like PostgreSQL) is finished...
Docker Volume Data Missing After Container Recreation
Data that seems to vanish after recreating a container almost always means the data was never actually stored in a persistent, correctly-referenced volume in...
Postgres Column "Does Not Exist" Due to Case Sensitivity Quotes
A column that clearly exists but produces a "does not exist" error almost always comes down to PostgreSQL's specific case-folding rules for unquoted...
Postgres Slow COUNT Query on Large Table, Fast Alternatives
A slow COUNT(*) on a large PostgreSQL table isn't a missing-index problem in the usual sense — it's a fundamental consequence of how PostgreSQL's MVCC...
Postgres Index Not Being Used on LOWER or UPPER Query
A standard index on a text column doesn't get used when you wrap that column in LOWER() or UPPER() in a query, because a regular index is built on the raw...
Linux systemd Service Fails to Start on Boot
A systemd service that starts fine manually but fails specifically during boot almost always means it's starting before something it actually depends on is...
Postgres Backup and Restore With pg_dump, Common Errors
Most pg_dump and pg_restore failures come down to a small set of recurring causes — version mismatches between the tools and the server, missing permissions on...