mongorestore size

[Martinus Martinus]

Hi,

I tried to restore my backup from mongodump into my new clusters using mongorestore. When I do show dbs from the mongos I got the size is not the same :

From original clusters :

admin (empty)

config (empty)

animal (empty)

animal2 (empty)

animal3 3.9521484384313226GB

animal4 0.203125GB

animal5 0.203125GB

animal6 0.203125GB

animal7 0.203125GB

test (empty)

animal8 19.8984375GB

animal9 0.203125GB

From new restore clusters :

config 0.046875GB

animal3 0.953125GB

animal4 0.078125GB

animal5 0.078125GB

animal6 0.078125GB

animal7 0.078125GB

animal8 2.90625GB

animal9 0.203125GB

Is this supposed to be normal?

Thanks.

[Jenna deBoisblanc]

Hello Martinus,

Mongorestore inserts documents one at a time into new extents, so you
are essentially de-fragmenting your data files. It is not surprising
that the dbs on the restored cluster are smaller than the original
databases.

[Martinus Martinus]

Hi Jenna,

Thank you for your explanations.

Best regards,

Martinus.

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