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Specifies a role name to be used to create the dump\&. This option causes
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command after connecting to the database\&. It is useful when the authenticated user (specified by
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\fB\-U\fR) lacks privileges needed by
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pg_dumpall, but can switch to a role with the required rights\&. Some installations have a policy against logging in directly as a superuser, and use of this option allows dumps to be made without violating the policy\&.