Correct answer - "Create a LSI" : LSI stands for Local Secondary Index. Some applications only
need to query data using the base table's primary key; however, there may be situations where an
alternate sort key would be helpful. To give your application a choice of sort keys, you can
create one or more local secondary indexes on a table and issue Query or Scan requests against
these indexes.
"Call Scan" - Scan is an operation on the data. Once you create your local secondary indexes on a
table you can then issue a Scan requests again
"Create a GSI" - GSI (Global Secondary Index) is an index with a partition key and a sort key
that can be different from those on the base table
"Migrate away from DynamoDB" - Migrating to another database that is not NoSQL may cause you to
make changes that require substantial code changes