Exam AWS Certified Data Engineer - Associate DEA-C01 topic 1 question 94 discussion

ALL distribution is optimal for slowly changing dimension tables and generally small in size to allow for optimal joins.

The most cost-effective solution to speed up the query performance by minimizing the broadcasting of the store location table would be: A. Change the distribution style of the store location table from EVEN distribution to ALL distribution. In Amazon Redshift, the ALL distribution style replicates the entire table to all nodes in the cluster, which eliminates the need to redistribute the data when executing a query. This can significantly improve query performance. Given that the store location table is updated only once or twice every few years, the overhead of maintaining the replicated data would be minimal. This makes it a cost-effective solution for improving the query performance.

Changing the distribution style of the store location table to ALL distribution (A) is the most cost-effective solution. It directly addresses the issue of broadcasting by ensuring the entire table is available on each node, significantly improving join performance without incurring substantial additional costs.

Using ALL distribution means the table is replicated to all nodes, eliminating the need for broadcasting during queries. Since the store location table is updated infrequently, this will significantly speed up queries without incurring frequent update costs.