What is the key difference between traditional locking and optimistic locking in Redis?
Traditional locking blocks other clients, while optimistic locking allows concurrent access but detects conflicts.
Traditional locking is used for read operations, while optimistic locking is used for write operations.
Traditional locking is implemented with WATCH, while optimistic locking uses MULTI and EXEC.
WATCH
MULTI
EXEC
Traditional locking is only available in Redis Cluster, while optimistic locking can be used in standalone mode.
Which of the following is NOT a typical use case for integrating Redis with a SQL database?
Offloading write operations from the database to handle high traffic.
Implementing a real-time leaderboard by leveraging Redis' sorted sets.
Storing large blobs of unstructured data like images or videos.
Caching frequently accessed data to improve read performance.
Which Redis command is used to retrieve geospatial points within a specified radius?
GEOSEARCH
GEOADD
GEORADIUS
GEODIST
Which Redis command is used to add an element to a HyperLogLog?
HGET
PFADD
PFMERGE
PFCOUNT
Which configuration parameter in the redis.conf file is crucial for enabling Redis Cluster mode?
redis.conf
cluster-config-file
cluster-enabled
appendonly
cluster-node-timeout
Which use case is particularly well-suited for Redis Pub/Sub?
Implementing a real-time chat application.
Performing complex data aggregations.
Storing large JSON documents for retrieval.
Maintaining a persistent, ordered log of events.
What is a key advantage of using Redis Streams for data ingestion compared to directly pushing data to a message queue like Kafka?
Redis Streams offer more advanced message filtering capabilities.
Redis Streams allow for data persistence without relying on external systems.
Redis Streams eliminate the need for message acknowledgments, simplifying the architecture.
Redis Streams inherently support complex data transformations within the stream.
What Redis data structure would be MOST efficient for storing a user's session data with an expiry time?
String
List
Hash
Set
What happens when you execute RENAME key1 key2 and key2 already exists?
RENAME key1 key2
key2
The command blocks until key2 is deleted
key1 is renamed to key2, overwriting the existing key2
An error is returned, and no changes are made
key2 is renamed to a temporary name, and then key1 is renamed to key2
Which Redis feature allows you to persist data from memory to disk, providing some level of durability?
Replication
Transactions
Virtual Memory
Persistence