blocks|key|3094621|text|此other+question应该会回答您的问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3094622|无法将大于4MB+(转换为BSON时)的|3094623|文档保存到数据库。这是一个有点随意的限制(将来可能会提高)；它主要是为了防止糟糕的模式设计和确保一致的性能。|blockquote|3094624|3094625|3094626|请注意，在这个问题的精选答案中，评论者提到它现在可能大到8mb或16mb。|3094627|因此，回答您的问题，并不是说单个字符串只能有一定的长度，而是整个文档必须小于16MB。|3094628|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/4667597/understanding-mongodb-bson-document-size-limit^0|1|E|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@$A|X|B|Y|1|Z]]|C|$]]|$1|D|3|E|5|6|7|10|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|11|8|@]|9|@]|C|$]]|$1|I|3|-4|5|6|7|12|8|@]|9|@]|C|$]]|$1|J|3|-4|5|6|7|13|8|@]|9|@]|C|$]]|$1|K|3|L|5|6|7|14|8|@]|9|@]|C|$]]|$1|M|3|N|5|6|7|15|8|@]|9|@]|C|$]]|$1|O|3|-4|5|6|7|16|8|@]|9|@]|C|$]]]|P|$Q|$5|R|S|T|C|$U|V]]]]

This <a href="https://stackoverflow.com/questions/4667597/understanding-mongodb-bson-document-size-limit">other question</a> should answer your question:

<blockquote>
 Documents larger than 4MB (when converted to BSON) cannot be saved to the database. This is a somewhat arbitrary limit (and may be raised in the future); it is mostly to prevent bad schema design and ensure consistent performance.
</blockquote>

Note that in the picked answer for that question the commenter mentions that it could be as large as 8mb or 16mb now. 

So to answer your question, it's not necessarily that a single string can only be a certain length, but rather that the whole document must be under 16MB.

blocks|key|2880602|text|请参阅this|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2880603|2880604|最大BSON文档大小为16+is+。最大文档大小有助于确保单个文档在传输过程中不会使用过多的RAM或过多的带宽。为了存储大于最大大小的文档，MongoDB提供了GridFS+API。|blockquote|style|BOLD|2880605|2880606|entityMap|0|LINK|mutability|MUTABLE|url|https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&cad=rja&uact=8&sqi=2&ved=0ahUKEwjP7Ie2-q3UAhVFWBQKHevCCw0QFggmMAI&url=http%253A%252F%252Fdocs.mongodb.com%252Fmanual%252Freference%252Flimits&usg=AFQjCNF_VYd3syNxwYa6r8yL5k0124GUDQ&sig2=Khdr4hZUTO6S1TnqTdLvbg^0|3|4|0|0|0|B|6|28|A|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|-4|5|6|7|W|8|@]|9|@]|C|$]]|$1|E|3|F|5|G|7|X|8|@$A|Y|B|Z|H|I]|$A|10|B|11|H|I]]|9|@]|C|$]]|$1|J|3|-4|5|6|7|12|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|13|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

See <a href="https://www.google.com/url?sa=t&amp;rct=j&amp;q=&amp;esrc=s&amp;source=web&amp;cd=3&amp;cad=rja&amp;uact=8&amp;sqi=2&amp;ved=0ahUKEwjP7Ie2-q3UAhVFWBQKHevCCw0QFggmMAI&amp;url=http%3A%2F%2Fdocs.mongodb.com%2Fmanual%2Freference%2Flimits&amp;usg=AFQjCNF_VYd3syNxwYa6r8yL5k0124GUDQ&amp;sig2=Khdr4hZUTO6S1TnqTdLvbg" rel="nofollow noreferrer">this</a>:

<blockquote>
 The maximum BSON document size is 16 megabytes. The maximum document
 size helps ensure that a single document cannot use excessive amount
 of RAM or, during transmission, excessive amount of bandwidth. To
 store documents larger than the maximum size, MongoDB provides the
 GridFS API.
</blockquote>

blocks|key|223496|text|关注here|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|223497|223498|最大BSON文档大小为16+16。|blockquote|223499|223500|最大文档大小有助于确保单个文档在传输过程中不会使用过多的RAM或过多的带宽。为了存储大于最大大小的文档，MongoDB提供了GridFS接口。有关GridFS的更多信息，请参阅和您的驱动程序的文档|223501|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.mongodb.com/manual/reference/limits/^0|2|4|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|-4|5|6|7|W|8|@]|9|@]|C|$]]|$1|E|3|F|5|G|7|X|8|@]|9|@]|C|$]]|$1|H|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]|$1|I|3|J|5|6|7|Z|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|10|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

Follow <a href="https://docs.mongodb.com/manual/reference/limits/" rel="nofollow noreferrer">here</a>
<blockquote>
The maximum BSON document size is 16 megabytes.
The maximum document size helps ensure that a single document cannot use excessive amount of RAM or, during transmission, excessive amount of bandwidth. To store documents larger than the maximum size, MongoDB provides the GridFS API. See mongofiles and the documentation for your driver for more information about GridFS.
</blockquote>

I wasn't able to find any information on the max length for a string data type in MongoDB on the main mongodb.org site. I'm coming from a relational database background and there are usually max lengths. Thank you!

What is the length maximum for a string data type in MongoDB used with Ruby?

数据库

MongoDB

在主mongodb.org站点上的MongoDB中，我找不到任何关于字符串数据类型的最大长度的信息。我来自关系数据库背景，通常有最大长度。谢谢!

问在MongoDB中，字符串数据类型的最大长度是多少？
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问在MongoDB中，字符串数据类型的最大长度是多少？
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