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Home/ Questions/Q 8214915
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Editorial Team
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Editorial Team
Asked: June 7, 20262026-06-07T11:36:49+00:00 2026-06-07T11:36:49+00:00

I was wondering that for a given set of data, the MongoDB datafiles in

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I was wondering that for a given set of data, the MongoDB datafiles in /data/db are larger than the data set inserted into the database .Why such happening in mongoDB ? can someone clear me on this.

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  1. Editorial Team
    Editorial Team
    2026-06-07T11:36:51+00:00Added an answer on June 7, 2026 at 11:36 am

    MongoDB preallocates disk space, so the actual storage on disk will always be larger than the data set.

    Each datafile is preallocated to a particular size. (This is done to prevent file system fragmentation, among other reasons.) The first filename for a database is .0, then .1, etc. .0 will be 64MB, .1 128MB, et cetera, up to 2GB. Once the files reach 2GB in size, each successive file is also 2GB.

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