Which of the following is NOT a typical use case for integrating Redis with a SQL database?
Implementing a real-time leaderboard by leveraging Redis' sorted sets.
Caching frequently accessed data to improve read performance.
Offloading write operations from the database to handle high traffic.
Storing large blobs of unstructured data like images or videos.
Which use case is particularly well-suited for Redis Pub/Sub?
Maintaining a persistent, ordered log of events.
Performing complex data aggregations.
Storing large JSON documents for retrieval.
Implementing a real-time chat application.
What happens when you execute RENAME key1 key2 and key2 already exists?
RENAME key1 key2
key2
key1 is renamed to key2, overwriting the existing key2
The command blocks until key2 is deleted
key2 is renamed to a temporary name, and then key1 is renamed to key2
An error is returned, and no changes are made
How does the WATCH command help in implementing optimistic locking in Redis?
WATCH
It prevents other clients from reading the watched keys.
It acquires an exclusive lock on the watched keys.
It monitors the watched keys for changes by other clients.
It sets a time-to-live (TTL) on the watched keys.
What is the key difference between traditional locking and optimistic locking in Redis?
Traditional locking is only available in Redis Cluster, while optimistic locking can be used in standalone mode.
Traditional locking blocks other clients, while optimistic locking allows concurrent access but detects conflicts.
Traditional locking is implemented with WATCH, while optimistic locking uses MULTI and EXEC.
MULTI
EXEC
Traditional locking is used for read operations, while optimistic locking is used for write operations.
What technique involves splitting your data across multiple Redis instances to handle datasets larger than the memory of a single server?
Hashing
Sharding
Data Pipelining
Replication
Which Redis feature allows you to persist data from memory to disk, providing some level of durability?
Virtual Memory
Transactions
Persistence
How can Redis be used effectively with a NoSQL database like MongoDB?
All of the above
For storing real-time metrics and counters related to MongoDB operations.
For implementing distributed locking mechanisms for concurrent MongoDB updates.
As a caching layer for frequently accessed MongoDB documents.
How do subscribers express interest in receiving messages from specific channels?
By executing the SUBSCRIBE command with the channel name.
SUBSCRIBE
By writing a Lua script that listens for messages on the channel.
By setting a special key in Redis with the channel name.
By establishing a direct connection to the publisher.
When a transaction is executed with EXEC, and a watched key has been modified, what is the expected return value?
The string "OK".
The integer 1.
1
An empty list ([]).
[]
The integer 0.
0