显然，在每个postgresql服务器安装上默认创建一个数据库“postgres”。任何人都可以告诉我或指出我的文档它是用什么？
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看来它没有真正有一个明确的目的。根据文档：
Creating a database cluster consists of creating the directories in which the database data will live,generating the shared catalog tables (tables that belong to the whole cluster rather than to any particular database),and creating the “template1” and “postgres” databases.
[…]
The postgres database is a default database meant for use by users,utilities and third party applications.
(来源：http://www.postgresql.org/docs/8.2/interactive/app-initdb.html)
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