django.db.utils.OperationalError: 服務器意外關閉了連接

Question

無法解決是什么錯誤。

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

當我運行以下任何命令時，我一直在獲取跟蹤

1. python manage.py makemigrations
2. python manage.py runserver

Unhandled exception in thread started by <function wrapper at     0x0000000003DAC4A8>
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\runserver.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\recorder.py", line 65, in applied_migrations
    self.ensure_schema()
    File "C:\Python27\lib\site-packages\django\db\migrations\recorder.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.

提前致謝。

Answer 1

這通常意味着您的 PostgreSQL 服務器沒有正常運行。 您可能希望通過以下方式重新啟動它

Linux

sudo /etc/init.d/postgresql restart

窗戶

sc stop postgresql
sc start postgresql

Mac OS X

如何在 Mac OS X 上啟動 PostgreSQL 服務器？

如果重新啟動修復了它，請注意之前服務器故障的根本原因仍然需要調查。

Answer 2

我不認為重啟數據庫服務器應該是這里的第一步。 這僅在遷移中發生嗎？ 對該數據庫和/或數據庫服務器的其他查詢是否符合預期？

Answer 3

我再次卸載和安裝 postgresql 解決了這個問題。

在 Mac 上

卸載：

brew uninstall --force postgres

安裝：

brew install postgres

PS：更改 Linux 或 Windows 的命令。

之后，運行 makemigrations 並遷移。

Answer 4

當進程派生和在父進程中建立的連接在子進程中不起作用時發生。

我使用huggingface/tokenizers和BERT來獲取句子嵌入，然后將它們插入到 Postgres 數據庫中。 首先建立數據庫連接，然后分詞器分叉，導致相同的django.db.utils.OperationalError 。

我通過禁用TOKENIZER_PARALLELISM解決了它。 雖然對於您的問題，升級到更高版本的Django的可能有助於提到這里。