Some of the columns of a relation are at different sites is which of the following?

Solution (By Examveda Team)

Vertical partitioning, also known as column partitioning, involves dividing a table into smaller tables (or relations) by columns. Each smaller table contains a subset of the original columns from the parent table. This partitioning strategy is particularly useful when different columns of a relation are stored at different sites in a distributed database system.

Vertical partitioning offers several advantages:

Data Localization: By storing related columns together in the same partition, vertical partitioning localizes the data relevant to certain queries or transactions, thereby reducing the need for data transfer between sites during query execution.
Reduced Data Redundancy: Since each partition contains only a subset of columns, there is often a reduction in data redundancy compared to replicating entire rows (as in horizontal partitioning or data replication). This can lead to more efficient storage and better utilization of resources.
Improved Query Performance: Queries that only require a subset of columns can be processed more efficiently because they access only the relevant partitions, rather than scanning the entire table. This can result in faster query execution times and improved overall system performance.

In summary, vertical partitioning is the process of dividing a table by columns, where each partition contains a subset of columns. It is particularly beneficial when different columns of a relation are stored at different sites in a distributed database environment, as it enables data localization, reduces redundancy, and improves query performance.
So, in the given scenario, the correct option is Vertical Partitioning (Option C).