首页 \ 问答 \ 为什么你想要一个区分大小写的数据库?(Why would you want a case sensitive database?)

为什么你想要一个区分大小写的数据库?(Why would you want a case sensitive database?)

对不区分大小写的排序选择区分大小写的原因有哪些? 我可以看到DB引擎在进行字符串比较时可能会有适度的性能提升。 是吗? 如果您的数据设置为全部低或大写,那么区分大小写可能是合理的,但如果您存储混合大小写数据,然后尝试查询它,则会导致灾难。 您必须接着说在列上应用lower()函数,以便匹配相应的小写字符串文字。 这可以防止我使用的每个dbms中的索引使用情况。 所以想知道为什么有人会使用这样的选项。


What are some reasons for choosing a case sensitive collation over a case insensitive one? I can see perhaps a modest performance gain for the DB engine in doing string comparisons. Is that it? If your data is set to all lower or uppercase then case sensitive could be reasonable but it's a disaster if you store mixed case data and then try to query it. You have to then say apply a lower() function on the column so that it'll match the corresponding lower case string literal. This prevents index usage in every dbms that I've used. So wondering why anyone would use such an option.


原文:https://stackoverflow.com/questions/2986530
更新时间:2023-06-08 14:06

最满意答案

userAdminAnyDatabase的文档说( http://docs.mongodb.org/manual/reference/user-privileges/#userAdminAnyDatabase ):

但是, userAdminAnyDatabaseuserAdmin不明确授权用户使用超出用户管理的任何特权。

您还必须为list databases命令添加“ clusterAdmin ”角色: http : //docs.mongodb.org/manual/reference/user-privileges/#clusterAdmin

如果您希望用户从数据库和集合中读取/写入,则需要添加另一个角色,即“ readWrite ”角色: http : //docs.mongodb.org/manual/reference/user-privileges/#readWrite


The documentation on userAdminAnyDatabase says (http://docs.mongodb.org/manual/reference/user-privileges/#userAdminAnyDatabase):

However, userAdminAnyDatabase and userAdmin do not explicitly authorize a user for any privileges beyond user administration.

You will also have to add the "clusterAdmin" role for the list databases command: http://docs.mongodb.org/manual/reference/user-privileges/#clusterAdmin

If you want you user to read/write from the database and collections, you will need to add another role, the "readWrite" role: http://docs.mongodb.org/manual/reference/user-privileges/#readWrite

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