NoSQL

How does DynamoDB charge users for on-demand tables? a) Based on the provisioned capacity b) Based on the actual read and write requests c) Based on the number of indexes d) Based on the number of partitions Answer: b) Based on the actual read and write requests Explanation: In on-demand mode, DynamoDB charges based on […]

What is “TTL” in DynamoDB? a) Time To Log b) Time To Live c) Temporary Table Log d) Table Transaction Limit Answer: b) Time To Live Explanation: Time To Live (TTL) is a feature in DynamoDB that automatically deletes expired items from a table based on a timestamp attribute. Reference: DynamoDB Quiz – MCQ Questions

What is the default backup retention period for DynamoDB continuous backups? a) 24 hours b) 7 days c) 35 days d) 365 days Answer: c) 35 days Explanation: DynamoDB continuous backups, using point-in-time recovery, retain backups for up to 35 days, allowing you to recover from accidental data loss within this period. Reference: DynamoDB Quiz

What is DynamoDB Accelerator (DAX)? a) A cache for accelerating reads from DynamoDB tables b) A tool for writing queries c) A way to reduce the size of tables d) A system for backing up tables Answer: a) A cache for accelerating reads from DynamoDB tables Explanation: DynamoDB Accelerator (DAX) is a caching service that

What does “on-demand mode” mean in DynamoDB? a) The table scales automatically to handle workloads b) The table can only be used for a short time c) The table is available in certain regions only d) The table supports only one type of query Answer: a) The table scales automatically to handle workloads Explanation: In

What is a “provisioned mode” table in DynamoDB? a) A table where read/write capacity is automatically managed b) A table where read/write capacity is manually set by the user c) A table used only for archiving data d) A table with automatic backups enabled Answer: b) A table where read/write capacity is manually set by

What is the default limit on the number of tables that can be created in DynamoDB? a) 256 b) 500 c) 256 per region d) Unlimited Answer: c) 256 per region Explanation: The default limit is 256 tables per region in DynamoDB, but this limit can be increased by submitting a request to AWS Support.

How does DynamoDB handle transactions? a) DynamoDB does not support transactions b) DynamoDB supports ACID transactions across multiple items and tables c) DynamoDB supports transactions but only on a single item d) DynamoDB handles transactions by replicating data across tables Answer: b) DynamoDB supports ACID transactions across multiple items and tables Explanation: DynamoDB supports ACID

What is DynamoDB Streams used for? a) Streaming video content b) Capturing changes made to items in a DynamoDB table c) Scaling DynamoDB automatically d) Creating secondary indexes Answer: b) Capturing changes made to items in a DynamoDB table Explanation: DynamoDB Streams captures a time-ordered sequence of changes made to items in a table, enabling

What is a Local Secondary Index (LSI) in DynamoDB? a) An index that has the same partition key as the base table but a different sort key b) An index used for global queries c) An index for performing batch writes d) An index for archiving items Answer: a) An index that has the same

What does a Global Secondary Index (GSI) in DynamoDB allow you to do? a) Modify the primary key of a table b) Query data using an alternative key c) Automatically back up your data d) Archive old data Answer: b) Query data using an alternative key Explanation: A Global Secondary Index (GSI) allows you to

What is DynamoDB Auto Scaling used for? a) To increase database size automatically b) To automatically adjust read/write capacity based on demand c) To reduce the number of tables d) To automatically manage data replication Answer: b) To automatically adjust read/write capacity based on demand Explanation: DynamoDB Auto Scaling automatically adjusts a table’s provisioned read

What does provisioned throughput in DynamoDB refer to? a) The number of tables that can be created b) The read and write capacity units that can be allocated to a table c) The disk storage used for the table d) The amount of traffic a table can handle Answer: b) The read and write capacity

What is the maximum size of an item in DynamoDB? a) 400 KB b) 1 MB c) 10 MB d) 5 MB Answer: a) 400 KB Explanation: The maximum size of an individual item in DynamoDB, including all attributes, is 400 KB. Reference: DynamoDB Quiz – MCQ Questions and Answers

What type of consistency model does DynamoDB provide by default? a) Strongly consistent reads b) Eventually consistent reads c) Immediate consistency d) Eventual consistency only for writes Answer: b) Eventually consistent reads Explanation: DynamoDB provides eventually consistent reads by default. However, it also offers an option for strongly consistent reads if required. Reference: DynamoDB Quiz

How does DynamoDB achieve high availability? a) By storing data in a single region b) By replicating data across multiple regions and availability zones c) By using a single instance d) By caching data on the client-side Answer: b) By replicating data across multiple regions and availability zones Explanation: DynamoDB achieves high availability by replicating

What are the two types of primary keys in DynamoDB? a) Simple key and complex key b) Partition key and sort key c) Foreign key and composite key d) Private key and public key Answer: b) Partition key and sort key Explanation: DynamoDB uses two types of primary keys: the partition key (simple primary key)

What is the primary key used for in DynamoDB? a) To store large files b) To uniquely identify each item in a table c) To enforce referential integrity d) To join two tables together Answer: b) To uniquely identify each item in a table Explanation: In DynamoDB, the primary key is used to uniquely identify

Which company provides DynamoDB as a service? a) Microsoft b) Amazon Web Services (AWS) c) Google d) IBM Answer: b) Amazon Web Services (AWS) Explanation: DynamoDB is a managed NoSQL database service provided by Amazon Web Services (AWS). Reference: DynamoDB Quiz – MCQ Questions and Answers

What type of database is DynamoDB? a) Relational database b) NoSQL database c) Object-oriented database d) In-memory database Answer: b) NoSQL database Explanation: DynamoDB is a NoSQL database that provides key-value and document data structures, offering scalability and low-latency performance. Reference: DynamoDB Quiz – MCQ Questions and Answers