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...
Category
PostgreSQL
Fixing PostgreSQL errors, performance issues and configuration quirks.
Postgres "Permission Denied for Schema Public" After PostgreSQL 15 Update
"Permission denied for schema public" appearing right after upgrading to PostgreSQL 15 isn't a bug or a misconfiguration you introduced — it's the direct,...
PostgreSQL Connection Closed Unexpectedly During Large Transaction
A connection dropping specifically during a large, long-running transaction usually comes down to one of a few specific limits being hit — a statement timeout,...
PostgreSQL "Deadlock Detected" During Concurrent Batch Updates
Deadlocks during concurrent batch updates specifically (as opposed to normal application traffic) almost always come down to multiple batch processes updating...
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 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...
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...
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...
PostgreSQL COPY Command Permission Denied on Server
A permission denied error on COPY almost always comes down to confusing server-side COPY (which reads/writes files on the database server's own filesystem,...