21.5. Default Roles
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 Table 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.
Table 21.1. Default Roles
| Role | Allowed Access |
|---|---|
| pg_read_all_settings | Read all configuration variables, even those normally visible only to superusers. |
| pg_read_all_stats | Read all pg_stat_* views and use various statistics related extensions, even those normally visible only to superusers. |
| pg_stat_scan_tables |
Execute monitoring functions that may take
ACCESS SHARE
locks on tables,
potentially for a long time.
|
| pg_monitor |
Read/execute various monitoring views and functions.
This role is a member of
pg_read_all_settings
,
pg_read_all_stats
and
pg_stat_scan_tables
.
|
| pg_signal_backend | Signal another backend to cancel a query or terminate its session. |
The
pg_monitor
,
pg_read_all_settings
,
pg_read_all_stats
and
pg_stat_scan_tables
roles are intended to allow administrators to easily configure a role for the
purpose of monitoring the database server. They grant a set of common privileges
allowing the role to read various useful configuration settings, statistics and
other system information normally restricted to superusers.
The
pg_signal_backend
role is intended to allow
administrators to enable trusted, but non-superuser, roles to send signals
to other backends. Currently this role enables sending of signals for
canceling a query on another backend or terminating its session. A user
granted this role cannot however send signals to a backend owned by a
superuser. See
Section 9.26.2
.
Care should be taken when granting these roles to ensure they are only used where needed to perform the desired monitoring.
Administrators can grant access to these roles to users using the GRANT command, for example:
GRANT pg_signal_backend TO admin_user;