How to Fix "MemoryError" When Processing Large Files in pandas/Python
Loading a large CSV or dataset into pandas crashes the process instead of completing, because the entire file is being loaded into RAM at once and there simply...
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All troubleshooting articles, newest first.
How to Resolve "ImportError: Cannot Import Name X From Partially Initialized Module"
An import that should work fine fails with a message specifically mentioning a "partially initialized module," which is Python's precise way of describing a...
How to Fix "FATAL: password authentication failed for user" in PostgreSQL
PostgreSQL rejects your connection attempt with a password authentication error, even when you're confident the password is correct. This error means...
How to Resolve "FATAL: Remaining Connection Slots Are Reserved for Non-Replication Superuser Connections"
PostgreSQL has hit its maximum connection limit and is now refusing new connections from regular application users, reserving whatever's left specifically for...
How to Fix "PostgreSQL Column Does Not Exist" Casing/Quote Issue
A query references a column you can clearly see in your table definition, but PostgreSQL insists it doesn't exist. This is almost always a case-sensitivity...
How to Resolve "pkill / pg_terminate_backend Not Killing Database Query"
You call pg_terminate_backend() on a runaway query expecting it to stop immediately, but the process lingers, still consuming resources, sometimes for a...
How to Fix "ERROR: Deadlocks Detected" in PostgreSQL Transactions
Two concurrent transactions each wait on a lock the other holds, and PostgreSQL detects the standoff and automatically kills one to break the cycle. Unlike an...
How to Resolve "PostgreSQL Database System Is Shutting Down" Startup Error
Connections to PostgreSQL fail with a message saying the database system is shutting down, even though you didn't intentionally stop it. This message means...
How to Fix "ERROR: Duplicate Key Value Violates Unique Constraint"
An INSERT or UPDATE fails because it would create a duplicate value in a column that's supposed to be unique. PostgreSQL is doing exactly what a unique...