删除Mongo集合不会清除磁盘空间 [英] Dropping Mongo collection not clearing disk space

问题描述

我有一个包含750,000个文档的集合，它在磁盘上大约占用7Gb.

I have a collection with 750,000 documents, it's taking around 7Gb on the disk.

我删除了集合，但是文件(test.0 ... test.11)仍在磁盘上.

I've dropped the collection, but the files (test.0...test.11) are still on the disk.

• 如果删除它们，那么我会丢失所有集合，而不仅仅是丢失的集合
• Mongo不能删除它们吗?

仅注意到数据库统计信息有误.

Just noticed that the database stats have an error.

{
    "ok" : 0,
    "errmsg" : "Collection [test.loadTest-2016-02-06 15:05:34Z] not found."
}

推荐答案

您删除了一个集合，但没有删除包含该集合的数据库.删除集合不会压缩数据文件，也不会删除文档.如果您确实要压缩数据库，请完全删除它并重新导入它，或者使用repairDatabase对其进行压缩(请参阅

You have dropped a collection, but not the database containing it. Dropping the collection does not compact the data files, nor does deleting a document. If you really want to compact the database, either drop it entirely and reimport it, or compact it using repairDatabase (see the docs). Beware though, you cannot compact the database online I think if you just have one node.

如果有副本集，则添加新节点并删除旧节点是在线压缩数据库的最安全方法.我不时这样做，这很容易.

If you have a replica set, adding new nodes and removing the old ones is the safest way of compacting the database online. I do that from time to time and it's easy.

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