Postgres Connection Pool Leak With Node or Python App
A connection pool leak means your application is checking out database connections from the pool but not consistently returning them, so the pool gradually...
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Postgres "LOCK TABLE" Deadlock Waiting Forever
An explicit LOCK TABLE statement that just hangs, rather than producing Postgres's usual automatic deadlock error, usually means it's waiting on a lock held by...
Docker Container Slow Performance on macOS (Docker Desktop)
Slow Docker performance specifically on macOS, especially with heavy file I/O like Node.js dependency installs or hot-reloading dev servers, comes down to how...
MySQL Dump File Too Large to Import, How to Split
A dump file too large to import comfortably usually isn't actually a hard limit being hit — it's more often a practical problem with timeouts, memory...
Nginx "Worker_connections Exceeded" Error Fix
Hitting Nginx's worker_connections limit means each worker process has reached the maximum number of simultaneous connections it's configured to handle — this...
React Native App Stuck on Splash Screen
An app stuck permanently on its splash screen almost always means something during app initialization is failing silently, or the code responsible for...
Go Goroutine Leak, How to Detect and Fix
A goroutine leak happens when a goroutine gets stuck permanently — usually blocked waiting on a channel operation that will never complete — and never...
Docker Healthcheck Always Showing Unhealthy
A container marked "unhealthy" by Docker despite the application clearly working when tested manually almost always means the healthcheck command itself is...
Nginx 502 Bad Gateway With Docker Container
A 502 Bad Gateway from Nginx in a Docker setup almost always means Nginx successfully received the request but couldn't get a valid response from the upstream...