mongodb: import/export dump/restore command snippets

278 words · 2 min read

I have a mongodb database. I need to export import its data frequently. In this post, I keep mongo terminal commands to remember how to do it.

JSON vs BSON (Dump vs Partial Data)

First issue is what the data format is going to be.

mongodb has two pairs of commands:

  • mongodump and mongorestore that exports and imports everything in BSON format.
  • mongoexport and mongoimport that exports and imports only requested collection in JSON format.

Dump and Restore BSON Files

mongodump command dumps everything into the directory given by -o argument in BSON format.

mongodump -h ${HOSTNAME} -u ${DBUSER} -p ${DBPASS} -d ${DBNAME} -o /srv/app/mongo

Note that the following expressions are environment variables defined in bash terminal: -h ${HOSTNAME} -u ${DBUSER} -p ${DBPASS} -d ${DBNAME}

mongorestore command reads all BSON files in the directory and restores the database.

mongorestore -h ${HOSTNAME} -u ${DBUSER} -p ${DBPASS} --db ${DBNAME} /srv/app/mongo

Export and Import JSON Files

mongoexport and mongoimport commands export and import only one collection per call.

mongoexport -h ${HOSTNAME} -u ${DBUSER} -p ${DBPASS} -d ${DBNAME} -c admin_locations -o admin_locations.json --jsonArray 

This statement exports a single collection (aka table) called admin_locations into the file admin_locations.json.

Note the argument --jsonArray. This argument lets mongodb to put multiple json records into an array. If you don’t specify it, all json records are separated by whitespace and many JSON readers will fail to read the file then.

mongoimport -h ${HOSTNAME} -u ${DBUSER} -p ${DBPASS} -d ${DBNAME} --file admin_locations.json

This statement imports the file admin_locations.json into a collection. Since the collection name is not given, mongodb assumes that it has the same name as json file ie. admin_locations.

 Tech    5 Feb, 2018

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Mert Nuhoglu is a Trabzon-born programmer and data scientist.

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