A supermarket chain wants you to implement an in-memory database that can be used to access facts about the products they sell. Although a snapshot of this database will be periodically copied to disk, its contents fit in memory, and your component of the application will operate only on data stored in memory.
Here are the requirements specified by the managers of the supermarket chain:__________.
A) They want to be able to retrieve product records by specifying the name of the product.
B) They want to be able to specify the first n characters of a product name and to retrieve all records that begin with those characters.
C) They want the time required to retrieve a record to be as efficient as possible – on the order of 20 operations per retrieval, given a database of approximately one million records.
D) They want to be able to increase the size of the database – adding large sets of new records – without taking the system offline.

The in memory is used in database to increase the storage size. In memory database management system primarily relies on the main memory. All the data will be stored and managed on the main memory. This is used in the systems where there is need for data access for large files, There can be many risks associated with this setup which can even lead to server failure.