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Apache Iceberg to ClickHouse integration

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

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4.8 on G2
Apache IcebergSource
WeldWeld
ClickHouseWarehouse
Weld · New sync
Apache IcebergSourceApache IcebergConnected
Tables to sync

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

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

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How it works

How to set up Apache Iceberg to ClickHouse in Weld.
In the app, with the API or an agent.

API guideMCP docs
Weld · New Apache Iceberg sync
Apache IcebergNew connectionApache IcebergAuthorised
Connection nameiceberg
AuthorizeOpens Apache Iceberg to grant read access
Use cases

Why replicate Apache Iceberg to ClickHouse?
Ready for analysis.

Centralizing your Apache Iceberg 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 Apache Iceberg data directly in ClickHouse using SQL or your preferred BI tool.

Consolidate data from Apache Iceberg alongside other databases and applications in a single database for a unified analytical layer.

  • Database replication for analytics

    Replicate your Apache Iceberg production data to ClickHouse without impacting database performance. Query historical data without load on your primary database.

  • Centralized data warehouse

    Bring Apache Iceberg 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 Apache Iceberg to ClickHouse. Connect BI tools like Looker, Metabase, or Power BI.

Data

What data can you replicate?
From Apache Iceberg to ClickHouse.

Weld syncs the objects the Apache Iceberg 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 Apache Iceberg context, finds the tables it needs and runs the query in ClickHouse.

    Set up the MCP serverClaudeCursorChatGPTGemini
    Claude CodeOpus 5
    >

    Which Apache Iceberg tables do we have in ClickHouse, and which is the largest?

    Looking up what Weld has synced from Apache Iceberg.

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

    Technical considerations.
    What to expect.

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

    ClickHouse setup guide

    How to connect ClickHouse to Weld, step by step.

    Connector

    Apache Iceberg connector

    Everything Weld does with Apache Iceberg.

    Connector

    ClickHouse connector

    Everything Weld does with ClickHouse.

    FAQ

    Common questions.
    About Apache Iceberg to ClickHouse.

    Start syncing Apache Iceberg to ClickHouse.

    Set up your Apache Iceberg data pipeline in minutes. No credit card required. Free for 14 days.

    Apache IcebergSource
    WeldWeld
    ClickHouseWarehouse
    Start for freeTalk to us
    Related

    Related integrations.
    More with Apache Iceberg and ClickHouse.

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