我们正在讨论如何在MongoDB中存储日期。我对Mongo还很陌生，所以当我在文档中看到以下内容时(http://api.mongodb.org/perl/MongoDB/DataTypes.html#Dates)我想知道：
Warning: creating DateTime objects is extremely slow. Consider saving dates as numbers and converting the numbers to DateTimes when needed. A single DateTime field can make deserialization up to 10 times slower.
如果我们只是存储它们，并让它们对存储中的对象进行查询，这是一回事，但如果我们对这些字段进行过滤或排序，那似乎是另一回事。问题是从数字到DateTime的来回转换。欢迎对性能考虑进行任何思考。谢谢
Internally both datetime and long are stored as 64 bit ints per bsonspec http://bsonspec.org/#/specification. So there not be an additional perf penalty due to the cast from a server perspective. the problem is with the slowness of DateTime in perl. Note: use datetime or long consistently as one will not match the other.
在本次谈话的其他地方提到，但值得总结：
所讨论的性能问题纯粹是一个Perl问题，并且与用Perl创建DateTime对象的成本有关。它与一般MongoDB的性能无关，也与Perl以外语言的MongoDB驱动程序无关。C#驱动程序应该不会出现DateTimes的性能问题。
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