43 articles tagged #Database
Your INSERT ... ON CONFLICT DO UPDATE looks right, but rows are never actually updated. This guide digs into the common causes — wrong conflict targets, excluded column mistakes, and WHERE clause gotchas — and shows you how to fix each one.
Your DigitalOcean Managed Postgres cluster starts throwing 'too many clients' errors the moment traffic spikes — and the fix isn't just bumping the pool size. Here's how to diagnose and resolve connection pool exhaustion for good.
Your sqlite3 query returns b'hello' instead of 'hello' and suddenly string comparisons, splits, and JSON parsing all break. Here's exactly why this happens and three ways to fix it permanently.
Running a SQLite query inside a Python thread and getting nothing back? The culprit is almost always connection sharing across thread boundaries. Here's exactly how to diagnose and fix it.
You added an index to speed up your SQLite queries, but now you're getting wrong results. This guide explains exactly why that happens and how to diagnose and fix it without losing your data.
You run your INSERT statements, see no errors, query the table in your script — rows are there. But when you reopen the database file, everything is gone. Here's exactly why sqlite3 silently discards your writes and how to fix it for good.
Your PostgreSQL window function looks right but the numbers are off — ranks are wrong, running totals restart unexpectedly, or partitions blend together. Here's exactly why that happens and how to fix it.
Neon and CockroachDB both promise serverless Postgres that scales to zero. But cold-start latency, free tier limits, and billing surprises differ dramatically. Here's what we found after running both under real workloads.
PostgreSQL's DISTINCT ON picks the first row per group — but 'first' is defined by ORDER BY, not your intuition. If you're getting the wrong row, here's exactly why it happens and how to fix it.
Writing emoji or non-ASCII characters to SQLite from Python and getting garbled text, question marks, or silent data loss? Here's exactly why it happens and how to fix it for good.
Getting 'database is locked' errors when multiple threads or processes write to the same SQLite file? This guide walks through every real fix — from timeout tuning to WAL mode — so your concurrent writes stop failing.
Ran ALTER TABLE on your SQLite database and now your Python queries are returning wrong values or old column names? This is a classic schema-cache and cursor reuse problem — here's exactly how to fix it.