What is the OKA (PostgreSQL) process responsible for and why is it eating up almost all of the server's memory?

Question

PostgreSQL

Periodically (I could not establish a pattern) PostgreSQL 12 starts a certain process called OKA. Everything would be fine, but it devours almost all the memory - and you just have to kill it. I found the oka and oka.pid files in the PostgreSQL folder, apparently responsible for this process. What is this process, why does it eat up so much memory and how to solve the problem?
Ps the base is small

Answer 1

There is no such process or utility in postgresql. Especially in PGDATA (aka data_directory) if by the phrase "in the PostgreSQL folder" you meant PGDATA.
The first thought and the main hypothesis - you made some glaring mistake in setting up the database, for example, with trust or a light password to access the world - and now you are a well-deserved member of the botnet.