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I am using MongoDB 4.0 and I have 2 different databases as below:

First one with this stats

"collections" : 527,
"views" : 0,
"objects" : 20512406,
"avgObjSize" : 145.463036271805,
"dataSize" : 2983796858.0,
"storageSize" : 10980642816.0,
"numExtents" : 0,
"indexes" : 2335,
"indexSize" : 7409999872.0

and the other one with this stats

"collections" : 483,
"views" : 0,
"objects" : 11765584,
"avgObjSize" : 6324.48132315404,
"dataSize" : 74411216264.0,
"storageSize" : 30270824448.0,
"numExtents" : 0,
"indexes" : 1632,
"indexSize" : 939061248.0,

I am using WiredTiger Storage Engine and I know that it compress data and keep it on disc. My question is why in first database, storageSize is larger than dataSize but in the second on dataSize is larger than storageSize?

And one more question, why numExtents : 0 I know that it contains data extents and index extents but why it shows 0?

Mohammad Taherian
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