Catalog contains what information?

Catalog contains what information?

• A. User permissions
• B. Data types
• C. Table names and fields
• D. Index statistics

Answer: (C)

A catalog (often called a system catalog or data dictionary) is a metadata repository that describes the structure of the data. Its main job is to tell you what data objects exist and how they are laid out, not to hold the actual data. The most fundamental pieces of that structural metadata are the table names and the fields (columns) they contain, which together define each table’s shape and relationships. Knowing which tables exist and what columns they have lets the database understand how to access and validate data, perform joins, enforce constraints, and generate queries. Permissions and index statistics are also types of metadata in many systems, but they describe separate aspects of the environment (who can access data and how data is optimized for performance). The core catalog content that defines the data’s architecture is the tables and their fields. Data types are part of those field definitions, but the essential information the catalog provides is the structure: table names and the fields they encompass.

A catalog (often called a system catalog or data dictionary) is a metadata repository that describes the structure of the data. Its main job is to tell you what data objects exist and how they are laid out, not to hold the actual data. The most fundamental pieces of that structural metadata are the table names and the fields (columns) they contain, which together define each table’s shape and relationships. Knowing which tables exist and what columns they have lets the database understand how to access and validate data, perform joins, enforce constraints, and generate queries.

Permissions and index statistics are also types of metadata in many systems, but they describe separate aspects of the environment (who can access data and how data is optimized for performance). The core catalog content that defines the data’s architecture is the tables and their fields. Data types are part of those field definitions, but the essential information the catalog provides is the structure: table names and the fields they encompass.