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of 26What are the different data types supported by Redis?
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Redis supports several data types:
- String: Binary-safe strings up to 512MB
- Hash: Field-value pairs, like objects
- List: Ordered collection of strings
- Set: Unordered collection of unique strings
- Sorted Set (ZSet): Set ordered by a score
- Bitmap: String treated as bit array
- HyperLogLog: Probabilistic data structure for cardinality estimation
- Geospatial: Longitude/latitude coordinates
- Stream: Log-like data structure for message queues
SET mykey "hello" # String
HSET user:1 name "John" # Hash
LPUSH mylist "item1" # List
SADD myset "member1" # Set
ZADD myzset 1 "item1" # Sorted Set
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What is the difference between Redis and traditional relational databases?
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| Aspect | Redis | Relational Database |
|---|---|---|
| Storage | In-memory | Disk-based |
| Data Model | Key-value, NoSQL | Relational tables |
| Schema | Schema-less | Fixed schema |
| ACID | Limited ACID properties | Full ACID compliance |
| Performance | Extremely fast (microseconds) | Slower (milliseconds) |
| Persistence | Optional | Always persistent |
| Query Language | Commands | SQL |
| Relationships | No joins | Complex relationships |
| Use Cases | Caching, sessions, real-time | Complex business logic |
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Explain Redis persistence mechanisms.
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Redis offers two persistence options:
RDB (Redis Database Backup):
- Point-in-time snapshots
- Compact binary format
- Good for backups and disaster recovery
- Can lose data between snapshots
AOF (Append Only File):
- Logs every write operation
- Better durability (can be configured for every operation)
- Larger file size
- Slower restart times
# RDB configuration
SAVE 900 1 # Save if at least 1 key changed in 900 seconds
SAVE 300 10 # Save if at least 10 keys changed in 300 seconds
# AOF configuration
appendonly yes
appendfsync everysec # Options: always, everysec, no
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What are the common use cases for Redis?
How does Redis handle memory management?
Explain Redis transactions and their limitations.
What is Redis Pub/Sub and how does it work?
Explain Redis Cluster and its benefits.
What is pipelining in Redis and when should you use it?
How does Redis replication work?
What are Redis Modules and name some popular ones?
Explain different Redis configuration parameters for performance tuning.
How do you implement Redis as a message queue?
How would you implement distributed locking using Redis?
Explain Lua scripting in Redis and its advantages.
How do you monitor and debug Redis performance issues?
Explain Redis Stream data structure and its use cases.
How do you implement high availability for Redis?
Describe advanced Redis memory optimization techniques.
How would you design a Redis-based caching strategy for a high-traffic application?
Explain Redis security best practices and implementation.
How do you handle Redis failover and disaster recovery?
Design a Redis-based rate limiting system.
How would you implement a distributed cache invalidation system using Redis?
Describe advanced Redis data modeling techniques for complex applications.
What are Redis Sentinel use cases and configuration?
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