- What's New
- Function Overview
- Service Overview
- Getting Started
- User Guide
- Best Practices
- Developer Guide
-
API Reference
- Before You Start
- API Overview
- API Calling
-
API
- Console
-
LakeCat
- Function Management
- Catalog Management
- Database Management
- Table Management
- Data Table Statistics
- Zone-based Management
- Partition Statistics
- Authorization Management
- User Group Management
- Metadata Statistics
-
Role Management
- Creating a Role
- Listing Roles on Different Pages by Condition
- Deleting a Role
- Obtaining a Role
- Modifying a Role
- Listing All Role Names
- Querying the Users or User groups Under a Role
- Adding One or More Users or User Groups to a Role
- Removing One or More Users or User Groups from a Role
- Updating the Entities in a Role
- Credential Management
- Configuration Management
- User
- Application Examples
- Permissions and Supported Actions
- Appendix
- Change History
- FAQs
- General Reference
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Metadata
Data Catalogs
A top-level resource in the metadata resources of a LakeFormation instance and multiple catalogs can be created in a LakeFormation instance. Metadata information such as name, description, and location are included in catalogs. Catalogs can be created, modified, and deleted.
Location indicates the file directory of the OBS parallel file system mapped to the catalog.
Databases
Databases are stored in the data catalogs of a LakeFormation instance and multiple databases can be created under a catalog. Metadata information such as name, description, and location are included in databases. You can create, modify, and delete databases, as well as grant and check databases permissions.
Location indicates the file directory of the OBS parallel file system mapped to the databases.
Tables
You can create multiple tables in a database. Metadata such as basic information, format and serialization information, fields, and attributes are included in tables. You can create, modify, and delete tables, as well as grant and check permissions.
Functions
Functions are used to perform specific processing on data in SQL queries, including built-in functions and user-defined functions (UDFs).
User-defined functions are classified into the following types:
- Common UDFs: used to perform operations on a single data row and export a single data row.
- User-defined aggregating functions (UDAFs): used to input multiple data rows and export a single data row.
- User-defined table-generating functions (UDTFs): used to perform operations on a single data row and export multiple data rows.
Partitions
Partitioning is to split a data table by row to reduce the total amount of data read and write operations in specific SQL operations, and therefore shortening the response time.
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