Postgres SSL SYSCALL error: EOF detected with python and psycopg

Question

Using psycopg2 package with python 2.7 I keep getting the titled error: psycopg2.DatabaseError: SSL SYSCALL error: EOF detected

It only occurs when I add a WHE

Answer 1

In my case that was OOM killer (query is too heavy)

Check dmesg:

dmesg | grep -A2 Kill

In my case:

Out of memory: Kill process 28715 (postgres) score 150 or sacrifice child