关于python：django.db.utils.OperationalError：服务器意外关闭了连接 server closed the connection unexpectedly

django.db.utils.OperationalError: server closed the connection unexpectedly

无法解决什么是错误。

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django.db.utils.OperationalError: server closed the connection unexpectedly
This probably means the server terminated abnormally
before or while processing the request.

当我运行下面的任何命令时，我继续获取跟踪

python manage.py生成迁移

python manage.py运行服务器

Unhandled exception in thread started by
Traceback (most recent call last): File"C:\Python27\lib\site-packages\django\utils\autoreload.py", line 226, in wrapper fn(*args, **kwargs)
File"C:\Python27\lib\site packages\django\core\management\commands
unserver.py", line 124, in inner_run
self.check_migrations()
File"C:\Python27\lib\site-packages\django\core\management\base.py", line 437, in check_migrations
executor = MigrationExecutor(connections[DEFAULT_DB_ALIAS])
File"C:\Python27\lib\site-packages\django\db\migrations\executor.py", line 20, in __init__
self.loader = MigrationLoader(self.connection)
File"C:\Python27\lib\site-packages\django\db\migrations\loader.py", line 52, in __init__
self.build_graph()
File"C:\Python27\lib\site-packages\django\db\migrations\loader.py", line 203, in build_graph
self.applied_migrations = recorder.applied_migrations()
File"C:\Python27\lib\site-packages\django\db\migrations
ecorder.py", line 65, in applied_migrations
self.ensure_schema()
File"C:\Python27\lib\site-packages\django\db\migrations
ecorder.py", line 52, in ensure_schema
if self.Migration._meta.db_table in self.connection.introspection.table_names(self.connection.cursor()):
File"C:\Python27\lib\site-packages\django\db\backends\base\base.py", line 231, in cursor
cursor = self.make_debug_cursor(self._cursor())
File"C:\Python27\lib\site-packages\django\db\backends\base\base.py", line 204, in _cursor
self.ensure_connection()
File"C:\Python27\lib\site-packages\django\db\backends\base\base.py", line 199, in ensure_connection
self.connect()
File"C:\Python27\lib\site-packages\django\db\utils.py", line 94, in __exit__
six.reraise(dj_exc_type, dj_exc_value, traceback)
File"C:\Python27\lib\site-packages\django\db\backends\base\base.py", line 199, in ensure_connection
self.connect()
File"C:\Python27\lib\site-packages\django\db\backends\base\base.py", line 171, in connect
self.connection = self.get_new_connection(conn_params)
File"C:\Python27\lib\site-packages\django\db\backends\postgresql\base.py", line 176, in get_new_connection
connection = Database.connect(**conn_params)
File"C:\Python27\lib\site-packages\psycopg2\__init__.py", line 164, in connect
conn = _connect(dsn, connection_factory=connection_factory, async=async)
django.db.utils.OperationalError: server closed the connection unexpectedly
This probably means the server terminated abnormally
before or while processing the request.

事先谢谢。