How to read all rows from huge table?

Question

I have a problem with processing all rows from database (PostgreSQL). I get an error: org.postgresql.util.PSQLException: Ran out of memory retrieving query results.

Answer 1

At lest in my case the problem was on the client that tries to fetch the results.

Wanted to get a .csv with ALL the results.

I found the solution by using

psql -U postgres -d dbname  -c "COPY (SELECT * FROM T) TO STDOUT WITH DELIMITER ','"

(where dbname the name of the db...) and redirecting to a file.