One unique feature of index file is that it contains
Answer Details
One unique feature of an index file is that it contains a reference number. An index file is a data structure that stores references to data records in a database or file system. The reference number serves as a pointer to the actual location of the data record, allowing for faster and more efficient access to the data.
When a user performs a search or query on a database, the index file is used to quickly locate the relevant data records, based on the reference number. This eliminates the need to search through the entire database, which can be time-consuming and resource-intensive.
The reference number in an index file can be generated in various ways, depending on the type of database or file system being used. Some databases use a sequential number, which is assigned to each data record in the order it is added to the database. Other databases use a relative number, which is based on the position of the data record within a specific block or page of the database.
In summary, the unique feature of an index file is that it contains a reference number, which serves as a pointer to the actual location of data records in a database or file system. This allows for faster and more efficient access to data, particularly when performing searches or queries on large databases.