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
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Development and Ops system table | Store operation data generated during development and Ops, including the tables below: Task information table Task dependency information table Task scheduling information table Parameter information table Workflow information table Instance running 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 |