显示mongodb索引内容 [英] Display mongodb index contents

问题描述

构建索引后，我想查看索引的内容。以MonboDB文档为例进行说明：

After building an index, I'd like to view the contents of the index. Taking an example for illustration from the MonboDB docs:

{ "_id" : ObjectId("..."),
"name" : "Warm Weather",
"author" : "Steve",
"tags" : [ "weather", "hot", "record", "april" ] }

然后标签字段上的索引将具有以下值：

Then an index on the tags field would have these values:

{ tags: "weather" }
{ tags: "hot" }
{ tags: "record" }
{ tags: "april" }

所以，我想运行一个命令，比如说， db.weather._tags_.find（）显示所述值。

So, I want to run a command, say, db.weather._tags_.find() to display said values.

问题：是否有这样的shell命令存在？或者有没有办法在C ++驱动程序中执行此操作？

Question: Does such a shell command exist? Or is there a way to do this in the C++ driver?

推荐答案

@ user1883451

@user1883451

你给出的例子是哈希索引，mongodb在内部存储B-Tree索引。

What you have given example is of hash index, mongodb internally stores B-Tree index.

所以你给出的例子并不总是正确的，mongodb结束在某些情况下以这种方式存储，但并非总是如此。 [可以用过于简单的方式理解它]

so example you have given is not always correct, mongodb end-up storing in that way in some case, but not always. [It is fine to understand it in oversimplified way]

1. shell是客户端，并且它没有显示内部如何存储索引


2. 驱动程序主要是与服务器交互（过度简化），它也不知道存储内容的方式。

A）如何查看mongodb索引

A)how to view mongodb index

最好的开始是获取mongo源代码并开始玩它。

Best start is to take mongo source code and start playing with it.

https://github.com/带索引的mongodb / mongo / tree / master / src / mongo / db / 文件*
https://github.com/mongodb/mongo/tree/master/src/mongo/db/ 文件与btree *

https://github.com/mongodb/mongo/tree/master/src/mongo/db/ files with index* https://github.com/mongodb/mongo/tree/master/src/mongo/db/ files with btree*

B）我假设你只是为了学习目的而努力。如果您有任何特定查询，为什么要这样做才能查出查询。

B)i assume you are trying to do just for learning purpose. If you are having any specific query, why you want to do that shoot out the query.

PS：
1.有更多代码和更少的文档内部和源代码。
2.您可以加入 http://groups.google.com/group/mongodb-开发

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