Where are the data files stored in MongoDB?
Data files. Every MongoDB instance consists of a namespace file, journal files and data files. For our discussion, we’ll only be focusing on data files, since that is where all of the data and indexes for your database reside. Data files store BSON documents, indexes, and MongoDB-generated metadata in structures called extents.
Which is bigger StorageSize or datasize in MongoDB?
The storageSize metric is equal to the size (in bytes) of all the data extents in the database. This number is larger than dataSize because it includes yet-unused space (in data extents) and space vacated by deleted or moved documents within extents. The storageSize does not decrease as you remove or shrink documents.
Which is better MySQL or MongoDB for databases?
MongoDB: “One advantage of MySQL over NoSQL like MongoDB is that the community in MySQL is much better than NoSQL. This is mostly because NoSQL is relatively new while MySQL has been around for several years,” says Jenny Richards at analyticbridge.com.
How to return the size of a collection in MongoDB?
MongoDB also provides the following methods to return specific sizes for the collection: db.collection.dataSize() to return the uncompressed data size in bytes for the collection. db.collection.storageSize() to return the size in bytes of the collection on disk storage.
How is free space allocated in MongoDB database?
Free database storage space is allocated to the collection but does not contain data. freeStorageSize does not include free space allocated to indexes. See indexFreeStorageSize for the total free index size. This value is always included in the dbStats output.
Which is the Diagnostic command for MongoDB database?
As your MongoDB grows in size, information from the db.stats () diagnostic command (or the database “Stats” tab in our management portal) becomes increasingly helpful for evaluating hardware requirements.
What is the default size for MongoDB to show?
The scale defaults to 1 to return size data in bytes. To display kilobytes rather than bytes, specify a scale value of 1024. If you specify a non-integer scale factor, MongoDB uses the integer part of the specified factor.