pg_authid

The pg_authid table contains information about database authorization identifiers (roles). A role subsumes the concepts of users and groups. A user is a role with the rolcanlogin flag set. Any role (with or without rolcanlogin) may have other roles as members. See pg_auth_members.

Since this catalog contains passwords, it must not be publicly readable. pg_roles is a publicly readable view on pg_authid that blanks out the password field.

Because user identities are system-wide, pg_authid is shared across all databases in a Oushu Database system: there is only one copy of pg_authid per system, not one per database.

column	type	references	description
oid	oid		Row identifier
rolname	name		Role name
rolsuper	boolean		Role has superuser privileges
rolinherit	boolean		Role automatically inherits privileges of roles it is a member of
rolcreaterole	boolean		Role may create more roles
rolcreatedb	boolean		Role may create databases
rolcanlogin	boolean		Role may log in. That is, this role can be given as the initial session authorization identifier
rolreplication	boolean		Role is a replication role. That is, this role can initiate streaming replication and set/unset the system backup mode using pg_start_backup and pg_stop_backup.
rolbypassrls	boolean		Roles bypasses every row-level security policy.
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		Password (possibly encrypted); NULL if none. If the password is encrypted, this column will begin with the string md5 followed by a 32-character hexadecimal MD5 hash. The MD5 hash will be the user’s password concatenated to their user name. For example, if user joe has password xyzzy, Greenplum Database will store the md5 hash of xyzzyjoe. Greenplum assumes that a password that does not follow that format is unencrypted.
rolvaliduntil	timestamptz		Password expiry time (only used for password authentication); NULL if no expiration
rolresqueue	oid		Object ID of the associated resource queue ID in pg_resqueue
rolcreaterextgpfd	boolean		Privilege to create read external tables with the gpfdist or gpfdists protocol
rolcreaterexhttp	boolean		Privilege to create read external tables with the http protocol
rolcreatewextgpfd	boolean		Privilege to create write external tables with the gpfdist or gpfdists protocol
rolresgroup	oid		Object ID of the associated resource group ID in pg_resgroup