How DBMS Stores Data?

Answer: DBMS stores data hierarchically on disks with records in files, accessed via indexes using optimized formats and secured transactions.

• Tables: Data in a DBMS is stored primarily in tables, where each table represents a specific entity or relationship.
• Rows and Columns: Tables consist of rows (records) and columns (attributes), with each row holding a unique record and each column representing a specific piece of information.
• Data Types: DBMS stores data using predefined data types such as integers, strings, dates, and more, ensuring consistency and facilitating efficient storage.
• Pages and Blocks: Storage is organized into pages or blocks, which are the basic units for reading and writing data. These units help optimize I/O operations.
• Indexes: Index structures are used to enhance data retrieval speed by providing a quick lookup mechanism. These indexes are stored separately from the actual data.
• File Structures: Actual storage on disk involves file structures such as B-trees or hash tables, allowing for efficient data access and modification.
• Normalization: Normalization techniques help organize data to minimize redundancy and dependencies, optimizing storage and maintaining data integrity.
• Compression: DBMS may use compression techniques to reduce storage space, especially for large datasets, by eliminating redundant or repeated information.