An index can be used to
Correct answer: A. Improve the performance of data base
- A. Improve the performance of data base
- B. Document the structure of database itself
- C. Reduce data dependancy for application program
- D. All of these
Explanation
Indexes in a database management system (DBMS) are data structures that improve the speed of data retrieval operations on a table. They work like the index of a book, allowing the database to quickly find the location of rows that match a certain criteria.
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Databases cover tables, records, fields, keys and relationships, together with database management systems and relational database design. The subject includes primary and foreign keys, normalization, SQL commands such as SELECT, INSERT, UPDATE and DELETE, queries, forms and reports, while distinguishing a database from a spreadsheet used for simple tabular data.
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