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Glossary

System Catalog Overview

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Last updated: 2026-04-24 16:39:59

What Is a System Catalog
System Catalog  is managed database tables in WeData, used to store operation data generated under your account. You can use historical tables to view historical data and process data as needed for retrospective analysis.
Usage Requirements
Accessing system catalog must use DLC Data Source. Other data sources do not currently support system table capacity.
Accessing system catalog must use tc-catalog.
Others
The current system table is a full non-partitioned table, which performs a full data overwrite every 5 minutes. If you need to use historic moment data, you need to configure a minute-level offline task to perform data write to your own table.
System tables are only readable and grantable by the root account by default. The root account can grant read permission to sub-accounts on demand.
All system tables are placed under system_catalog.wedata.
Existing System Tables
Table Classification
Description(Optional)
Data Update Frequency
Development and Ops system table
Store operation data generated during development and Ops, including the tables below:
[Task Scheduling Mode]
Task information table
Task dependency information table
Task scheduling information table
Parameter information table
Workflow information table
Instance running information table
[Workflow Scheduling Mode]
Workflow information table
Workflow scheduling info
Task information table
Workflow running information table
Task running information table
Parameter information table
Update every 5 minutes
Basic system table
Store operation data generated by the basic module, as shown in the table below:
Data source information table
Update every 5 minutes

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Tencent Cloud WeData

System Catalog Overview

What Is a System Catalog

Usage Requirements

Others

Existing System Tables

Help and Support

Table Classification	Description(Optional)	Data Update Frequency
Development and Ops system table	Store operation data generated during development and Ops, including the tables below: [Task Scheduling Mode] Task information table Task dependency information table Task scheduling information table Parameter information table Workflow information table Instance running information table [Workflow Scheduling Mode] Workflow information table Workflow scheduling info Task information table Workflow running information table Task running information table Parameter information table	Update every 5 minutes
Basic system table	Store operation data generated by the basic module, as shown in the table below: Data source information table	Update every 5 minutes