DynamoDB provides primary keys for quickly accessing items in a table by supplying primary key values in a query. The primary key is useful, and it can certainly speed up data retrieval from the table; however, in certain scenarios, applications can take advantage of secondary indexes. Secondary indexes can speed up item retrieval from a table based on any attribute aside from the primary key. For fulfilling these requirements, you need to create secondary indexes on the DynamoDB table. Once a secondary index is created on an attribute, you can use a Query or Scan request on specific indexes to retrieve items.
Secondary index refers to a data structure that is made up of a subset of attributes in a table. The main purpose of a secondary index is to provide an alternate key for query operations. You can use secondary indexes to read data using a query, in the same...