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I have a database in MongoDB, called dump. Currently, it reached 6GB in my server. I decided to delete 90% of data in this database to reduce the disk space it occupied. But after doing that its size is still 6GB, while the true storage size is only 250MB.
I guess this is the design of MongoDB? Is there any convinient way to reduce its size? Thank in advance.
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fileSize is larger than storageSize because it includes index extents and yet-unused space in data files. While fileSize does decrease when you delete a database, fileSize does not decrease as you remove collections, documents or indexes.
FYI: MongoDB does not release disk space after you delete a document, instead, it will reuse that space for future documents, hence the storageSize being bigger than dataSize .
collection. remove() — MongoDB Manual.
Try (source):
$ mongo mydb
> db.repairDatabase()
To compress the data files, you can run either start up MongoDB with mongod --repair, or connect to the database through the shell and run db.repairDatabase().
There's also a new compact command scheduled for v1.9 that will do in-place compaction.
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