Postgres "Database Is Being Accessed by Other Users" on Drop
PostgreSQL refuses to drop a database that has any active connections to it, as a safety measure — the error is expected behavior, not a bug, and the fix is...
Category
PostgreSQL
Fixing PostgreSQL errors, performance issues and configuration quirks.
PostgreSQL JSON Column Query Returning Null Unexpectedly
When a query against a JSON or JSONB column returns null even though the data clearly contains the key you're looking for, it's almost always because of the...
PostgreSQL Sequence Out of Sync After Manual Insert
When a PostgreSQL sequence falls out of sync — typically after manually inserting a row with an explicit ID — the database's auto-increment counter doesn't...
Postgres "Relation Does Not Exist" Error Fix
The "relation does not exist" error in PostgreSQL doesn't necessarily mean the table was never created — it very often means Postgres is looking in the wrong...
How to Reset PostgreSQL Password Inside Docker Container
Resetting a PostgreSQL password inside a Docker container is a bit different from a normal installation, because you're working through docker exec rather than...
Postgres Connection Refused Inside Docker Network
A "connection refused" error between two containers on the same Docker network almost always means the PostgreSQL container isn't reachable yet, isn't...
PostgreSQL "Too Many Connections" Error Fix
The "too many connections" error in PostgreSQL means the server has hit its configured connection limit and is refusing new clients. It's rarely caused by...
Postgres Slow Query on Indexed Column, Why
Having an index on a column doesn't guarantee PostgreSQL will actually use it, or that using it will make your query fast. When a query stays slow despite an...
Postgres UNION-Based Query Returning Unexpected Null Rows
When a UNION or UNION ALL query in PostgreSQL returns rows with unexpected NULL values in columns that clearly have data in the underlying tables, the cause is...