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Microsoft SQL Server to ClickHouse integration

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

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4.8 on G2
Microsoft SQL ServerSource
WeldWeld
ClickHouseWarehouse
Weld · New sync
Microsoft SQL ServerSourceMicrosoft SQL ServerConnected
Tables to sync

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

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

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How it works

How to set up Microsoft SQL Server to ClickHouse in Weld.
In the app, with the API or an agent.

Setup guideAPI guideMCP docs
Weld · New Microsoft SQL Server sync
Microsoft SQL ServerNew connectionMicrosoft SQL ServerAuthorised
Connection namemssql
AuthorizeOpens Microsoft SQL Server to grant read access
Use cases

Why replicate Microsoft SQL Server to ClickHouse?
Ready for analysis.

Centralizing your Microsoft SQL Server 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 Microsoft SQL Server data directly in ClickHouse using SQL or your preferred BI tool.

Consolidate data from Microsoft SQL Server alongside other databases and applications in a single database for a unified analytical layer.

  • Database replication for analytics

    Replicate your Microsoft SQL Server production data to ClickHouse without impacting database performance. Query historical data without load on your primary database.

  • Centralized data warehouse

    Bring Microsoft SQL Server 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 Microsoft SQL Server to ClickHouse. Connect BI tools like Looker, Metabase, or Power BI.

Data

What data can you replicate?
From Microsoft SQL Server to ClickHouse.

Weld syncs the objects the Microsoft SQL Server 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 Microsoft SQL Server context, finds the tables it needs and runs the query in ClickHouse.

    Set up the MCP serverClaudeCursorChatGPTGemini
    Claude CodeOpus 5
    >

    Which Microsoft SQL Server tables do we have in ClickHouse, and which is the largest?

    Looking up what Weld has synced from Microsoft SQL Server.

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

    Technical considerations.
    What to expect.

    Incremental syncing
    Weld uses incremental syncing where supported by the Microsoft SQL Server API, loading only new and updated records to minimize data transfer and warehouse costs.
    Change data capture
    For Microsoft SQL Server, 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 Microsoft SQL Server 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

    Microsoft SQL Server setup guide

    How to connect Microsoft SQL Server to Weld, step by step.

    Documentation

    ClickHouse setup guide

    How to connect ClickHouse to Weld, step by step.

    Connector

    Microsoft SQL Server connector

    Everything Weld does with Microsoft SQL Server.

    Connector

    ClickHouse connector

    Everything Weld does with ClickHouse.

    FAQ

    Common questions.
    About Microsoft SQL Server to ClickHouse.

    Start syncing Microsoft SQL Server to ClickHouse.

    Set up your Microsoft SQL Server data pipeline in minutes. No credit card required. Free for 14 days.

    Microsoft SQL ServerSource
    WeldWeld
    ClickHouseWarehouse
    Start for freeTalk to us
    Related

    Related integrations.
    More with Microsoft SQL Server and ClickHouse.

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