default PAM service name is postgresql. You can
optionally supply your own service name after the pam>
key word in the file pg_hba.conf.
- PAM is used only to validate username/password pairs,
- therefore the user must already exist in the database before PAM
+ PAM is used only to validate username/password pairs.
+ Therefore the user must already exist in the database before PAM
can be used for authentication. For more information about