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Which of the following indexes is created on a non-key field and defined on an ordered data file?
- a)Clustering index
- b)Primary index
- c)Secondary index
- d)B-trees
Correct answer is option 'A'. Can you explain this answer?
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Which of the following indexes is created on a non-key field and defin...
The correct answer is option 1 i.e. clustering index.
A clustering index is defined on an ordered data file. The data file is ordered on a non-key field.
The primary index is defined on an ordered data file. The data file is ordered on a primary key field.
A secondary index is defined on an unordered data file. It can be either a candidate key or some non-key field.
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Which of the following indexes is created on a non-key field and defin...
Understanding Indexes in Databases
Indexes are crucial for optimizing the performance of database queries. They allow for faster retrieval of records by providing a structured way to access data stored in files.
Clustering Index
- A clustering index is created on a non-key field in an ordered data file.
- It organizes data records in the same order as the index itself.
- This means that the records are physically stored on disk in the same order as the indexed field, which can significantly enhance the performance of queries that search based on that field.
Primary Index
- A primary index is associated with the primary key of a table.
- It helps in locating the records based on the unique key, but it does not apply to non-key fields.
Secondary Index
- A secondary index is also created on non-key fields, but it does not dictate the physical ordering of the data.
- Instead, it provides a separate structure that allows for efficient access to records based on non-primary key fields.
B-trees
- B-trees are a type of data structure used to implement indexes.
- While they can be used to create both primary and secondary indexes, they are not specific to non-key fields or ordered data files.
Conclusion
In summary, the correct answer is Clustering index (option 'A') as it is specifically designed to be created on a non-key field and defines the physical storage order of data in an ordered data file. This unique characteristic sets it apart from primary and secondary indexes, making it essential for optimizing queries on non-key fields.
Indexes are crucial for optimizing the performance of database queries. They allow for faster retrieval of records by providing a structured way to access data stored in files.
Clustering Index
- A clustering index is created on a non-key field in an ordered data file.
- It organizes data records in the same order as the index itself.
- This means that the records are physically stored on disk in the same order as the indexed field, which can significantly enhance the performance of queries that search based on that field.
Primary Index
- A primary index is associated with the primary key of a table.
- It helps in locating the records based on the unique key, but it does not apply to non-key fields.
Secondary Index
- A secondary index is also created on non-key fields, but it does not dictate the physical ordering of the data.
- Instead, it provides a separate structure that allows for efficient access to records based on non-primary key fields.
B-trees
- B-trees are a type of data structure used to implement indexes.
- While they can be used to create both primary and secondary indexes, they are not specific to non-key fields or ordered data files.
Conclusion
In summary, the correct answer is Clustering index (option 'A') as it is specifically designed to be created on a non-key field and defines the physical storage order of data in an ordered data file. This unique characteristic sets it apart from primary and secondary indexes, making it essential for optimizing queries on non-key fields.
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Which of the following indexes is created on a non-key field and defined on an ordered data file?a)Clustering indexb)Primary indexc)Secondary indexd)B-treesCorrect answer is option 'A'. Can you explain this answer?
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