复制一个集合到自己 [英] duplicate a collection into itself

问题描述

如何将mongodb集合复制到自身中，并在新的_id中解决了_id中的冲突?
使用此处的答案复制单个文档是不可行的适用于大型收藏.
我想这样做是为了以一种人为的方式增加测试样本的大小，这只是为了测试可伸缩性.所以我想，除了添加新文档，我还可以将集合复制几次以达到目的.

How can I copy a mongodb collection into itself with clashes in _id resolved by a new _id?
Copying individual documents using the answer here is not feasible for large collections.
I want to do this to increase the size of the testing sample in a contrived manner, this is just for testing the scalability. So I thought, instead of adding new documents, I could duplicate the collection into itself a few times to achieve the purpose.

推荐答案

如果您想为测试目的生成合理的数据，以下是使用一些命令行工具的便捷配方:

If you want to generate plausible data for test purposes, here's a handy recipe using some command line tools:

• mongodb-schema 推断现有集合的概率模式
• morelikethis 将该架构转换为模板
• mgeneratejs 根据架构模板生成新文档
• mongoimport 以便将新文档导入MongoDB

mongoimport是标准MongoDB命令行工具的一部分；前三个工具可从npm安装:

mongoimport is a part of the standard MongoDB command line tools; the first three tools are installable from npm:

npm install -g morelikethis mongodb-schema mgeneratejs

根据对现有文档的分析来生成1,000个新文档的示例用法:

Sample usage to generate 1,000 new documents based on an analysis of the existing documents:

mongodb-schema本地主机:27017 mydb.mycollection | morelikethis | mgeneratejs -n 1000 | mongoimport -d mydb -c mycollection

mongodb-schema localhost:27017 mydb.mycollection | morelikethis | mgeneratejs -n 1000 | mongoimport -d mydb -c mycollection

如果您还没有任何测试数据(或者更喜欢描述新文档的形状)，则可以始终跳过模式分析，并从mgeneratejs和mongoimport开始.

If you don't have any test data yet (or prefer to describe the shape of new documents) you could always skip the schema analysis and start with mgeneratejs and mongoimport.

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