Lec-93: Why Indexing is used | Indexing Beginning | DBMS

Recent questions

• Why is indexing important in database-related questions?

  Indexing is crucial in database-related questions because it helps optimize the retrieval of data stored in a database. By creating indexes on specific columns, the database management system can quickly locate the desired data without having to scan through every record. This process significantly reduces the number of blocks accessed during data retrieval, leading to lower I/O costs and improved efficiency in searching for specific information.

• How is data stored in a computer system?

  Data in a computer system is stored in two main components: RAM (Random Access Memory) and a hard disk. RAM is volatile memory that stores data temporarily while the computer is running, but it loses its contents when the power is turned off. On the other hand, a hard disk provides permanent storage for data, allowing information to be saved even when the computer is powered off. Since CPU speed is much faster than hard disk speed, data is often stored in the hard disk for long-term storage.

• What is the purpose of dividing a hard disk into logical blocks?

  Dividing a hard disk into logical blocks or pages serves the purpose of organizing and storing data efficiently. Each block is capable of holding a fixed number of records, making it easier for the system to manage and access data. By dividing the hard disk into these blocks, the system can allocate storage space more effectively and retrieve information more quickly when needed.

• How can the number of blocks needed to store data be calculated?

  The number of blocks needed to store data can be calculated by dividing the total number of records by the block size. This calculation helps determine the amount of storage space required to accommodate the data efficiently within the logical blocks of the hard disk. By accurately calculating the number of blocks needed, the system can optimize data storage and retrieval processes.

• What are the benefits of indexing in data retrieval?

  Indexing plays a crucial role in data retrieval by reducing the number of blocks accessed during searches, thus improving efficiency and lowering I/O costs. By creating indexes on specific columns, the system can quickly locate the desired data without scanning through every record in the database. This results in faster data retrieval, enhanced search performance, and overall improved efficiency in accessing specific information.