MongoDB Export and Import

Missing header

Mongo Export

• Export a collection to a JSON coded file.
• Runs a query on the collection to retrieve the documents.
• Can include query document from the command line to select documents.
• MongoDB optimizes the index selection.

Mongo Import

• Import JSON coded documents from a file to a collection.
• Optionally drop the collection.
• Can insert or update the documents.
• Each insert or update is a separate operation.
• Duplicate key errors are ignored. The import code does not call getLastError after inserts, and does not ever call getPrevError.
• Duplicate key errors are ignored even when stopOnError is set.
• Running with dbpath causes the mongoimport process to do the import directly to the database files.
• If mongoimport dbpath finds the env locked, it complains (good) but exits with a 0 exit code (bad).

Tests

• Located in jstests/tools/exportimport*.js.
• ToolTest requires /data/db for some reason.

Possible changes

• Make mongoimport transactional. All or no documents are imported.
• Make mongoimport check for errors, including duplicate key errors.
• Errors should cause mongoimport to exit with a non-zero exit code.
  • For example, mongoimport with a locked data directory should exit with a non-zero exit code.