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DocumentationData Lake ComputePractical TutorialImplementing Tencent Cloud TCHouse-D Read and Write Operations in DLC

Implementing Tencent Cloud TCHouse-D Read and Write Operations in DLC

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Last updated: 2026-01-30 15:57:51
Data Lake Compute (DLC) has a built-in Tencent Cloud TCHouse-D connector that enables you to connect to the Tencent Cloud TCHouse-D cluster by adding the necessary configurations during development. This document explains how to implement read and write operations for Tencent Cloud TCHouse-D in DLC.

Background Information

Tencent Cloud TCHouse-D is built on the industry-leading OLAP database Apache Doris kernel. It is MySQL protocol compatible and integrates with the cloud big data ecosystem. With extensive cluster control capabilities and a comprehensive inspection and alarm system, Tencent Cloud TCHouse-D offers simple-to-use and easy-to-maintain fully managed cloud services to help customers quickly perform real-time OLAP data analysis. For more information about Tencent Cloud TCHouse-D, refer to the Tencent Cloud TCHouse-D Overview.

Prerequisites

You have purchased the Tencent Cloud TCHouse-D cluster.
You have activated theDLC service.
Note:
Cross-regional read/write for Tencent Cloud TCHouse-D is not currently supported. Plan your environment accordingly to ensure that both Tencent Cloud TCHouse-D and DLC are in the same region.

Operation Steps

Step 1: Creating Tencent Cloud TCHouse-D Catalogs

1. Log in to the DLC console, select the service region, and ensure that the logged-in account has the catalog creation permission. To enable sub-account permissions, refer to Sub-account Permission Management.
2. Go to Data Management and click Create Data Catalog.
3. Go to the data source creation interface, and select Tencent Cloud TCHouse-D as the connection type. After entering the connection information, complete the network configurations to establish the network between the engine and the external data source.

4. Enter the data source information and click Confirm to create the data source.
5. In the data catalog list, you can view the connection information, status, creator, and other details.
Note:
You need to enter a username and password for an account with the corresponding Tencent Cloud TCHouse-D data permissions. Otherwise, queries will return an error.

Step 2: Querying or Writing Data to Tencent Cloud TCHouse-D

1. Log in to the DLC console, select Data Explore, and switch the data catalog in the top-left corner to the Tencent Cloud TCHouse-D catalog created in the previous step (assuming that the catalog is named "tchouse").
2. Create a query. Assume that a TPCDS benchmark dataset exists in Tencent Cloud TCHouse-D. Using the following sample SQL, you can join the dataset with the internal DLC data and write the results back to Tencent Cloud TCHouse-D.
insert into tchouse.tpcds.d_table
  SELECT
    a.sk AS ctr_customer_sk,
    b.sk AS ctr_store_sk
  FROM
    tchouse.tpcds.f_table a
  LEFT JOIN
    DataLakeCatalog.dlc.dlc_table b
  ON a.id = b.id
  WHERE 
    a.sssk = '123'
  GROUP BY
    a.sk,
    b.sk
;
3. Run the above query. The DLC computing engine will read the Tencent Cloud TCHouse-D dataset and write the query result total_return back to Tencent Cloud TCHouse-D.
Note:
Currently, dynamic overwrite is not supported for writing the query results back to Tencent Cloud TCHouse-D.

Previous Topic: Resource-Level Authentication GuideNext Topic: DLC Source Table Core Capabilities

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