实例初始化后，会创建如下数据库：

   Name    | Owner  | Encoding |   Collate   |    Ctype   
-----------+--------+----------+-------------+------------
SAMPLES   | SYSTEM | UTF8     | zh_CN.UTF-8 | zh_CN.UTF-8 
SECURITY  | SYSTEM | UTF8     | zh_CN.UTF-8 | zh_CN.UTF-8 
system    | SYSTEM | UTF8     | zh_CN.UTF-8 | zh_CN.UTF-8 
TEMPLATE0 | SYSTEM | UTF8     | zh_CN.UTF-8 | zh_CN.UTF-8 
TEMPLATE1 | SYSTEM | UTF8     | zh_CN.UTF-8 | zh_CN.UTF-8 
TEMPLATE2 | SYSTEM | UTF8     | zh_CN.UTF-8 | zh_CN.UTF-8 
TEST      | SYSTEM | UTF8     | zh_CN.UTF-8 | zh_CN.UTF-8