Question

A file is organized so that the ordering of data records is the same as or close to the ordering of data entries in some index. Then that index is called

Answer 1

EXPLANATION:

According to the given question, we can say that each data record in the data file has one entry in the index file. So it must be dense index.

This is the defination of Clustered index.

When is a file is organized so that the ordering of data records is the same as or close to the ordering of data entries in some index, we say that the index is clustered.

Answer 2

Answer:

A file is organized so that the ordering of data records is the same as or close to the ordering of data entries in some index. Then that index is called Clustered Indexing

Explanation:

• By reducing the number of disc accesses needed when a query is completed, indexing helps a database perform better. It is a data structure method used to identify and retrieve data in a database rapidly.

There are primarily three methods of indexing:  

• Clustered Indexing
• Non-Clustered or Secondary Indexing
• Multilevel Indexing

Concept:

• The clustered index is as same as a dictionary where the data is arranged by alphabetical order. In a clustered index, the index contains a pointer to block but not direct data.
• A file is organized so that the ordering of data records is the same as, or close to the ordering of data entries in some indexes. Such an index is commonly known as the clustered index.

Additional Information

• Sparse indexes only contain entries for documents that have the indexed field, even if the index field contains a null value. The index skips over any document that is missing the indexed field. The index is "sparse" because it does not include all documents of a collection.
• In dense index, there is an index record for every search key value in the database. This makes searching faster but requires more space to store index records itself. Index records contain search key values and a pointer to the actual record on the disk.In a clustered index, actual records rather than pointers are kept in the index. Non-primary key columns, which might not be unique for each record, are occasionally used to generate the index. In this case, you can group two or more columns to obtain the distinct values and produce a type of index known as a clustered index. Additionally, it makes it easier for you to locate the record.