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Azure Cosmos DB to ClickHouse integration

Replicate your Azure Cosmos DB data into ClickHouse with Weld. Automatically replicate the tables you choose from Azure Cosmos DB into ClickHouse, keeping your analytics layer up to date and ready for querying.

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4.8 on G2
Azure Cosmos DBSource
WeldWeld
ClickHouseWarehouse
Weld · New sync
Azure Cosmos DBSourceAzure Cosmos DBConnected
Tables to sync

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

  • Extract
  • Load
  • Keep in sync
ClickHouseDestinationClickHouseReady
azure_cosmos_db schema
  • azure_cosmos_db.Synced
  • azure_cosmos_db.Syncing
  • azure_cosmos_db.Synced
  • azure_cosmos_db.Synced

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How it works

How to set up Azure Cosmos DB to ClickHouse in Weld.
In the app, with the API or an agent.

Setup guideAPI guideMCP docs
Weld · New Azure Cosmos DB sync
Azure Cosmos DBNew connectionAzure Cosmos DBAuthorised
Connection nameazure_cosmos_db
AuthorizeOpens Azure Cosmos DB to grant read access
Use cases

Why replicate Azure Cosmos DB to ClickHouse?
Ready for analysis.

Centralizing your Azure Cosmos DB data in ClickHouse lets you join it with other data sources for cross-platform analytics and deeper insights.

Build reliable dashboards and reports by querying Azure Cosmos DB data directly in ClickHouse using SQL or your preferred BI tool.

Consolidate data from Azure Cosmos DB alongside other databases and applications in a single database for a unified analytical layer.

  • Database replication for analytics

    Replicate your Azure Cosmos DB production data to ClickHouse without impacting database performance. Query historical data without load on your primary database.

  • Centralized data warehouse

    Bring Azure Cosmos DB data into ClickHouse 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 Azure Cosmos DB to ClickHouse. Connect BI tools like Looker, Metabase, or Power BI.

Data

What data can you replicate?
From Azure Cosmos DB to ClickHouse.

Weld syncs the objects the Azure Cosmos DB connector exposes into ClickHouse, 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 ClickHouse for you.

    Connect Claude, Cursor, ChatGPT or your own agent to Weld over MCP. It reads the Azure Cosmos DB context, finds the tables it needs and runs the query in ClickHouse.

    Set up the MCP serverClaudeCursorChatGPTGemini
    Claude CodeOpus 5
    >

    Which Azure Cosmos DB tables do we have in ClickHouse, and which is the largest?

    Looking up what Weld has synced from Azure Cosmos DB.

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

    Technical considerations.
    What to expect.

    Incremental syncing
    Weld uses incremental syncing where supported by the Azure Cosmos DB API, loading only new and updated records to minimize data transfer and warehouse costs.
    Change data capture
    For Azure Cosmos DB, 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 Azure Cosmos DB adds new fields, they're detected and added to the corresponding ClickHouse 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

    Azure Cosmos DB setup guide

    How to connect Azure Cosmos DB to Weld, step by step.

    Documentation

    ClickHouse setup guide

    How to connect ClickHouse to Weld, step by step.

    Connector

    Azure Cosmos DB connector

    Everything Weld does with Azure Cosmos DB.

    Connector

    ClickHouse connector

    Everything Weld does with ClickHouse.

    FAQ

    Common questions.
    About Azure Cosmos DB to ClickHouse.

    Start syncing Azure Cosmos DB to ClickHouse.

    Set up your Azure Cosmos DB data pipeline in minutes. No credit card required. Free for 14 days.

    Azure Cosmos DBSource
    WeldWeld
    ClickHouseWarehouse
    Start for freeTalk to us
    Related

    Related integrations.
    More with Azure Cosmos DB and ClickHouse.

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