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db.collection.totalSize()

db.collection.totalSize()
Returns:The total size in bytes of the data in the collection plus the size of every index on the collection.

If collection data is compressed (which is the default for WiredTiger), the returned size reflects the compressed size of the collection data.

If an index uses prefix compression (which is the default for WiredTiger), the returned size reflects the compressed size of the index.

The value returned is the sum of db.collection.storageSize() and db.collection.totalIndexSize() in bytes.