Database users

Informix®

Until version 11.70.xC2, Informix database users must be created at the operating system level and must be members of the 'informix' group.

Starting with 11.70.xC2, Informix supports database-only users with the CREATE USER instruction, as in most other db servers.

Any database user must have sufficient privileges to connect and use resources of the database; user rights are defined with the GRANT command.

PostgreSQL

dbname=# CREATE USER user-name PASSWORD 'password';
CREATE USER
dbname=# GRANT ALL PRIVILEGES ON DATABASE dbname TO user-name;
GRANT

Solution

Based on the application logic (if it is a multiuser application), you have to create one or several PostgreSQL users.