SYSTEM CATALOG · 系统目录

pg_authid

The catalog pg_authid contains information about database authorization identifiers (roles). A role subsumes the concepts of “users” and “groups”. A user is essentially just a role with the rolcanlogin flag set. Any role (with or without rolcanlogin) can 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. Chapter 21 contains detailed information about user and privilege management. Because user identities are cluster-wide, pg_authid is shared across all databases of a cluster: there is only one copy of pg_authid per cluster, not one per database.

首次收录 PG 9.0最近收录 PG 19当前字段 12

9.0 9.1 9.2 9.3 9.4 9.5 9.6 10 11 12 13 14 15 16 17 18 19^β3

已与 PostgreSQL 18.6 实例逐字段核对 · 原始实测记录 ↗

字段结构 PostgreSQL 18

pg_authid

字段 / COLUMN	类型 / TYPE	说明 / DESCRIPTION
`oid`	`oid`NOT NULL	Row identifier
`rolname`	`name`NOT NULL	Role name
`rolsuper`	`boolean`NOT NULL文档原写法：`bool`	Role has superuser privileges
`rolinherit`	`boolean`NOT NULL文档原写法：`bool`	Role automatically inherits privileges of roles it is a member of
`rolcreaterole`	`boolean`NOT NULL文档原写法：`bool`	Role can create more roles
`rolcreatedb`	`boolean`NOT NULL文档原写法：`bool`	Role can create databases
`rolcanlogin`	`boolean`NOT NULL文档原写法：`bool`	Role can log in. That is, this role can be given as the initial session authorization identifier.
`rolreplication`	`boolean`NOT NULL文档原写法：`bool`	Role is a replication role. A replication role can initiate replication connections and create and drop replication slots.
`rolbypassrls`	`boolean`NOT NULL文档原写法：`bool`	Role bypasses every row-level security policy, see Section 5.9 for more information.
`rolconnlimit`	`integer`NOT NULL文档原写法：`int4`	For roles that can log in, this sets maximum number of concurrent connections this role can make. -1 means no limit.
`rolpassword`	`text`	Encrypted password; null if none. The format depends on the form of encryption used.
`rolvaliduntil`	`timestamp with time zone`文档原写法：`timestamptz`	Password expiry time (only used for password authentication); null if no expiration

标记“隐式列”的字段不包含在 SELECT * 中；部分早期统计视图由同版本源码补全，额外来源会显示在字段说明中。

通用系统列 6

PostgreSQL 提供的系统属性，通常不在 SELECT * 中展开。单独保留，不与普通字段混算。

字段	类型	attnum
`tableoid`	`oid`	-6
`cmax`	`cid`	-5
`xmax`	`xid`	-4
`cmin`	`cid`	-3
`xmin`	`xid`	-2
`ctid`	`tid`	-1

字段演化矩阵

悬停查看字段类型

存在新增 / 类型或属性变化移除

字段 / COLUMN	9.0	9.1	9.2	9.3	9.4	9.5	9.6	10	11	12	13	14	15	16	17	18	19
`oid`
`rolname`
`rolsuper`
`rolinherit`
`rolcreaterole`
`rolcreatedb`
`rolcatupdate`						−	–	–	–	–	–	–	–	–	–	–	–
`rolcanlogin`
`rolconnlimit`
`rolpassword`
`rolvaliduntil`
`rolreplication`	–
`rolbypassrls`	–	–	–	–	–

9.0 是收录基线；基线中已存在的字段不标记为新增。矩阵按字段名称对齐，重命名显示为旧字段移除与新字段新增。

演化时间线

相邻大版本的变化

PostgreSQL 19 ← 18

1 处字段说明更新

PostgreSQL 17 ← 16

1 处字段说明更新目录说明更新

PostgreSQL 14 ← 13

1 处字段说明更新目录说明更新

PostgreSQL 13 ← 12

1 处字段说明更新

PostgreSQL 12 ← 11

~ oid: 隐式列 → 常规列2 处字段说明更新

PostgreSQL 10 ← 9.6

1 处字段说明更新目录说明更新

PostgreSQL 9.6 ← 9.5

1 处字段说明更新目录说明更新

PostgreSQL 9.5 ← 9.4

+ rolbypassrls− rolcatupdate1 处字段说明更新

PostgreSQL 9.3 ← 9.2

1 处字段说明更新

PostgreSQL 9.1 ← 9.0

+ rolreplication1 处字段说明更新

比较任意两个版本

起始版本 / FROM目标版本 / TO包含描述更新

选择两个版本，查看字段的新增、移除与类型变化。交互比较需要 JavaScript；演化时间线可直接阅读。