Comment by calineczka

Thanks for answering, I appreciate. I found good documentation in https://mariadb.com/kb/en/lock-in-share-mode/ but I am not sure how it works in Postgres: https://www.postgresql.org/docs/9.1/explicit-locking.html

It says "This mode protects a table against concurrent data changes" but it does not elaborate how. Is it similar in consequences to what MariaDB describes?