The view pg_roles provides access to information about database roles. This is simply a publicly readable view of pg_authid that blanks out the password field. This view explicitly exposes the OID column of the underlying table, since that is needed to do joins to other catalogs.

    column type references description
    rolname name Role name
    rolsuper bool Role has superuser privileges
    rolinherit bool Role automatically inherits privileges of roles it is a member of
    rolcreaterole bool Role may create more roles
    rolcreatedb bool Role may create databases
    rolcatupdate bool Role may update system catalogs directly. (Even a superuser may not do this unless this column is true.)
    rolcanlogin bool Role may log in. That is, this role can be given as the initial session authorization identifier
    rolconnlimit int4 For roles that can log in, this sets maximum number of concurrent connections this role can make. -1 means no limit
    rolpassword text Not the password (always reads as **)
    rolvaliduntil timestamptz Password expiry time (only used for password authentication); NULL if no expiration
    rolconfig text[] Role-specific defaults for run-time configuration variables
    rolresqueue oid pg_resqueue.oid Object ID of the resource queue this role is assigned to.
    oid oid pg_authid.oid Object ID of role
    rolcreaterextgpfd bool Role may create readable external tables that use the gpfdist protocol.
    rolcreaterexthttp bool Role may create readable external tables that use the http protocol.
    rolcreatewextgpfd bool Role may create writable external tables that use the gpfdist protocol.
    rolresgroup oid pg_resgroup.oid Object ID of the resource group to which this role is assigned.

    Parent topic: System Catalogs Definitions