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Editorial Team
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Asked: 2026-06-04T09:12:54+00:00

I’m trying to dump a database from another server (this works fine), then restore

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I’m trying to dump a database from another server (this works fine), then restore it on a new server (this does not work fine).

I first run:

mongodump --host -d

This creates a folder dump/db which contains all of the bson documents.

Then in the dump folder, I’m running:

mongorestore -d dbname db

This works and iterates through the files, but I get this error on dbname.system.users

Wed May 23 02:08:05 { key: { _id: 1 }, ns: "dbname.system.users", name: "_id_" }
Error creating index dbname.system.usersassertion: 13111 field not found, expected type 16

Any ideas how to resolve this?

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1 Answer

  1. Editorial Team

    Any chance the source and destination are different versions?

    In any case, to get around this, restore the collections individually using the -c flag to the target DB and then build the indexes afterward. The system collection is the one used for indexes, so it is fairly easy to recreate – try it last once everything else has been restore, and if it still fails you can always just recreate the relevant indexes.

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