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41.26. pg_shadow

The catalog pg_shadow contains information about database users. The name stems from the fact that this table should not be readable by the public since it contains passwords. pg_user is a publicly readable view on pg_shadow that blanks out the password field.

Chapter 17 contains detailed information about user and privilege management.

Because user identities are cluster-wide, pg_shadow is shared across all databases of a cluster: there is only one copy of pg_shadow per cluster, not one per database.

Table 41-26. pg_shadow Columns

Name Type References Description
usename name   User name
usesysid int4   User ID (arbitrary number used to reference this user)
usecreatedb bool   User may create databases
usesuper bool   User is a superuser
usecatupd bool   User may update system catalogs. (Even a superuser may not do this unless this column is true.)
passwd text   Password (possibly encrypted)
valuntil abstime   Password expiry time (only used for password authentication)
useconfig text[]   Session defaults for run-time configuration variables