184 articles tagged #Debugging
XLOOKUP's approximate match modes are more nuanced than VLOOKUP's. If your formula keeps returning #N/A even though the lookup value clearly exists in a nearby range, the match mode and sort order are almost certainly the culprits.
When a single keypress types two characters, it's called key chatter — and it's more fixable than you think. Here's how to diagnose and resolve it without pulling switches or buying a new board.
Your ECS service should scale out automatically when traffic spikes, but it doesn't — tasks stay at minimum count while CPU pegs at 100%. Here's how to diagnose and fix stalled auto scaling before it costs you uptime.
A failed Terraform apply can leave a lock record in DynamoDB that blocks every subsequent command. Here's how to diagnose the stale lock, safely remove it, and prevent it from happening again.
ChatGPT can sketch pagination logic in seconds, but it consistently stumbles on off-by-one errors, incorrect total-page calculations, and edge cases like empty result sets. Here's how to prompt your way to correct, production-ready pagination every time.
You created a GIN index on a JSONB column but EXPLAIN ANALYZE still shows a sequential scan. Here's why PostgreSQL ignores your index and the exact steps to fix it without rewriting your schema.
Your LATERAL JOIN looks correct, but it returns no rows — even though the outer table has data and the subquery runs fine in isolation. Here's why it silently fails and how to fix it.
ChatGPT can draft Playwright tests fast, but the selectors it picks often break the moment your UI shifts. Here's how to prompt it for stable, maintainable test scripts that actually pass in CI.
PostgreSQL's UPDATE FROM syntax can silently update the wrong rows when a join matches multiple times — and you won't see an error. Here's how to diagnose, reproduce, and permanently fix this subtle bug in your queries.
Your INDEX MATCH formula looks right, but sorted data is feeding it wrong results. This guide breaks down the exact reason it happens and shows you the precise fix — no helper columns needed.
INDIRECT is powerful for dynamic references, but one wrong character in the sheet name and you get a #REF! error that's maddeningly hard to debug. Here's exactly what causes it and how to fix it for good.
ChatGPT can draft retry logic fast, but the default output often misses jitter, ignores maximum attempt caps, or quietly creates infinite loops. Here's how to prompt it correctly and validate what it gives you.