详解清除MongoDB所占用的多余的磁盘空间的方法

mongodump -d databasename -o /path/to/dump_dir
echo 'db.dropDatabase()' | mongo <databasename>
mongorestore -d <databasename> /path/to/dump_dir

db.repairDatabase()

db.runCommand({ repairDatabase: 1 })

{ repairDatabase: 1,
 preserveClonedFilesOnFailure: <boolean>,
 backupOriginalFiles: <boolean> }

db.collection.find().pretty()

{
 "_id" : ObjectId("5396cd3823e97923ba689ef3"),
 "batch" : 66,
 "category" : 4,
 "cover_imgs" : [
 "/post_imgs/5396cd3823e97923ba689ef3/c_2.jpg",
 "/post_imgs/5396cd3823e97923ba689ef3/c_3.jpg",
 "/post_imgs/5396cd3823e97923ba689ef3/c_4.jpg"
 ],
 "created_at" : ISODate("2014-06-10T09:18:06.383Z"),
 "fav_count" : 0,
 "host_reply_count" : 338,
 "last_reply_date" : "2014-06-17 21:22:00",
 "post_date" : "2014-06-06 19:57:00",
 "referer" : "http://tieba.baidu.com/f",
 "reply_count" : 716,
 "reuse_type" : 2,
 "section" : "古装电视剧",
 "seq" : 27180,
 "serial" : false,
 "sort_index" : 0.997,
 "source_site" : "贴吧",
 "updated_at" : ISODate("2014-06-18T09:04:55.228Z"),
 "visible" : true
}
{
 "_id" : ObjectId("5396c7ca23e97921fb7de8e4"),
 "batch" : 74,
 "category" : 4,
}

DBQuery.prototype._prettyShell = true