=====PostgreSQL provides a set of default roles
which provide access to certain, commonly needed, privileged capabilities
and information. Administrators can GRANT these roles to users and/or
other roles in their environment, providing those users with access to
the specified capabilities and information.
The default roles are described in 表 21-1.
Note that the specific permissions for each of the default roles may
change in the future as additional capabilities are added. Administrators
should monitor the release notes for changes.
表 21-1. Default Roles
Role
Allowed Access
pg_signal_backend
Send signals to other backends (eg: cancel query, terminate).
Administrators can grant access to these roles to users using the GRANT
command: