Head-to-head comparison

NoSQLSync vs MongoDB Relational Migrator

NoSQLSync vs MongoDB Relational Migrator — the same problem, in opposite directions. Relational Migrator moves SQL into MongoDB; NoSQLSync moves MongoDB into SQL.

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NoSQLSync advantages
✓Runs the direction Relational Migrator does not — MongoDB out to SQL
✓Also handles DynamoDB and Firestore as sources
✓Infers a relational schema from schemaless documents, which is the hard half of this problem
✓Managed CDC with no Kafka or Debezium to operate
About MongoDB Relational Migrator

MongoDB's own free migration tool. Moves relational databases into MongoDB — and only in that direction.

Best for

Teams moving from a relational database into MongoDB. If you are going the other way, this tool cannot do it.

Pricing

Free. MongoDB offers it at no cost as an on-ramp to Atlas.

Feature comparison

FeatureNoSQLSyncMongoDB Relational Migrator
DirectionMongoDB, DynamoDB, Firestore → SQLSQL → MongoDB only
MongoDB as a sourceYes — that is the whole productNot supported
DestinationsPostgreSQL, MySQL, BigQuery, Snowflake, Redshift, ClickHouse, SQL Server, MariaDBMongoDB Server 5.0+ / Atlas
CDC supportNative oplog and Streams tailing, fully managedDebezium-based, Kafka or Confluent for long-running jobs
Schema mappingRelational schema inferred from documentsDocument schema designed from relational tables
DeploymentFully managed SaaSInstall and run it yourself
PriceFree plan, then flat monthly pricingFree
Pros of MongoDB Relational Migrator
+Free, and built by MongoDB itself
+Broad relational source coverage — Oracle, SQL Server, MySQL, PostgreSQL, DB2, Sybase ASE, TimescaleDB
+Visual schema mapping from relational tables to the document model
+Pre-migration analysis that flags incompatibilities before you start
+Converts SQL queries to aggregation pipeline code
+Snapshot and continuous (CDC) migration jobs
Cons of MongoDB Relational Migrator
−One direction only — MongoDB is always the destination, never the source
−No help at all if you are trying to move off MongoDB
−Continuous sync is Debezium-based and wants a Kafka or Confluent Cloud deployment for long-running jobs
−Installed and run yourself rather than managed for you

Frequently asked questions

Can MongoDB Relational Migrator migrate MongoDB to PostgreSQL?

No. Relational Migrator only runs in one direction: a relational database in, MongoDB out. MongoDB is never a supported source. If you need to move data from MongoDB into PostgreSQL or another SQL database, it is not the tool — that is what NoSQLSync does.

Is there a reverse mode or an export option?

There is no reverse mode. The product is designed as an on-ramp to MongoDB Atlas, so migrating away from MongoDB is outside what it is built to do.

Why does MongoDB not ship a MongoDB-to-SQL tool?

The tooling ecosystem is overwhelmingly built relational-to-document, because that is the direction vendors have an interest in supporting. The NoSQL-to-SQL direction is genuinely underserved, which is the reason NoSQLSync exists.

Should I use both?

They do not overlap. Relational Migrator is for consolidating a relational estate into MongoDB. NoSQLSync is for getting MongoDB, DynamoDB, or Firestore data into a SQL database for analytics, reporting, or a move back to relational.

Other comparisons

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