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如何查看最后一次操作的错误信息呢？
db.runCommand( { getLastError: 1, w: 2, wtimeout:5000 } ) https://docs.mongodb.com/manual/reference/command/getLastError/#examples
@leo
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開發時沒有複製集，使用 db.runCommand( { getLastError: 1 } ) 就可以了
不然會有 errmsg: cannot use 'w' > 1 when a host is not replicated
与 萌阔论坛 的连接断开，我们正在尝试重连，请耐心等待
