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PostgreSQL on RDS to MotherDuck integration

Replicate your PostgreSQL on RDS data into MotherDuck with Weld. Automatically replicate the tables you choose from PostgreSQL on RDS into MotherDuck, keeping your analytics layer up to date and ready for querying.

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4.8 on G2
PostgreSQL on RDSSource
WeldWeld
MotherDuckWarehouse
Weld · New sync
PostgreSQL on RDSSourcePostgreSQL on RDSConnected
Tables to sync

Your own tables, picked when you set up the sync.

  • Extract
  • Load
  • Keep in sync
MotherDuckDestinationMotherDuckReady
postgresql_on_rds schema
  • postgresql_on_rds.Synced
  • postgresql_on_rds.Syncing
  • postgresql_on_rds.Synced
  • postgresql_on_rds.Synced

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How it works

How to set up PostgreSQL on RDS to MotherDuck in Weld.
In the app, with the API or an agent.

Setup guideAPI guideMCP docs
Weld · Data warehouse
MotherDuckData warehouseMotherDuckConnected
Data locationChosen when you connect
CredentialsService account or key, stored encrypted
Use cases

Why replicate PostgreSQL on RDS to MotherDuck?
Ready for analysis.

Centralizing your PostgreSQL on RDS data in MotherDuck lets you join it with other data sources for cross-platform analytics and deeper insights.

Build reliable dashboards and reports by querying PostgreSQL on RDS data directly in MotherDuck using SQL or your preferred BI tool.

Consolidate data from PostgreSQL on RDS alongside other databases and applications in a single database for a unified analytical layer.

  • Database replication for analytics

    Replicate your PostgreSQL on RDS production data to MotherDuck without impacting database performance. Query historical data without load on your primary database.

  • Centralized data warehouse

    Bring PostgreSQL on RDS data into MotherDuck alongside other sources to create a single source of truth for your organization.

  • Automated reporting

    Replace manual exports and spreadsheet-based reporting with automated pipelines from PostgreSQL on RDS to MotherDuck. Connect BI tools like Looker, Metabase, or Power BI.

Data

What data can you replicate?
From PostgreSQL on RDS to MotherDuck.

Weld syncs the objects the PostgreSQL on RDS connector exposes into MotherDuck, and you choose which tables and fields to include. The connector's docs list what is available.

    Weld MCP server

    Ask your agent.
    It queries MotherDuck for you.

    Connect Claude, Cursor, ChatGPT or your own agent to Weld over MCP. It reads the PostgreSQL on RDS context, finds the tables it needs and runs the query in MotherDuck.

    Set up the MCP serverClaudeCursorChatGPTGemini
    Claude CodeOpus 5
    >

    Which PostgreSQL on RDS tables do we have in MotherDuck, and which is the largest?

    Looking up what Weld has synced from PostgreSQL on RDS.

    ●weld·search_available_references
    ⎿raw.postgresql_on_rds.*
    tables, columns and freshness
    ●weld·get_reference_schema
    ⎿columns, types and nullability
    ●weld·run_query
    ⎿select count(*) from {{raw.postgresql_on_rds.…}}
    submitted
    ●weld·get_query_status
    ⎿DONE
    ●weld·get_query_result
    ⎿rows returned
    ✓Answered from PostgreSQL on RDS data in MotherDuck
    >Ask about your PostgreSQL on RDS data
    Under the hood

    Technical considerations.
    What to expect.

    Incremental syncing
    Weld uses incremental syncing where supported by the PostgreSQL on RDS API, loading only new and updated records to minimize data transfer and warehouse costs.
    Change data capture
    For PostgreSQL on RDS, Weld can use log-based replication (CDC) to capture inserts, updates, and deletes without querying the entire table on every sync.
    Schema handling
    Weld automatically manages schema changes. If PostgreSQL on RDS adds new fields, they're detected and added to the corresponding MotherDuck tables.
    Data freshness
    Sync frequency depends on your Weld plan. Most connectors support schedules from every 5 minutes up to daily intervals.
    Security
    All data is encrypted in transit (TLS) and at rest. Weld is SOC 2 Type II compliant and supports IP whitelisting for database connections.
    Resources

    Keep reading.
    Guides, docs and schema.

    Documentation

    PostgreSQL on RDS setup guide

    How to connect PostgreSQL on RDS to Weld, step by step.

    Documentation

    MotherDuck setup guide

    How to connect MotherDuck to Weld, step by step.

    Connector

    PostgreSQL on RDS connector

    Everything Weld does with PostgreSQL on RDS.

    Connector

    MotherDuck connector

    Everything Weld does with MotherDuck.

    FAQ

    Common questions.
    About PostgreSQL on RDS to MotherDuck.

    Start syncing PostgreSQL on RDS to MotherDuck.

    Set up your PostgreSQL on RDS data pipeline in minutes. No credit card required. Free for 14 days.

    PostgreSQL on RDSSource
    WeldWeld
    MotherDuckWarehouse
    Start for freeTalk to us
    Related

    Related integrations.
    More with PostgreSQL on RDS and MotherDuck.

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