Redis interview question set

The annual interview peak is coming again , are you ready ？ Today, I sorted out what I had done before and what I interviewed Redis The real questions and answers have been sorted out and shared with everyone . In particular, it is classified , It is convenient for everyone to remember according to the module . Ongoing update ...

All the interview questions are here ......

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Catalog

1、Redis Basics

2、Redis Memory

3、Redis Partition

4、Redis Business

5、Redis Persistence

6、Redis Typical problem solutions

7、Redis lock

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Redis As the mainstream NoSQL technology , It has been widely used in the Internet . Especially in major domestic companies are very popular , For example, Ali. 、 byte 、 Baidu 、 JD.COM 、 Millet, etc. . therefore ,Redis It has also become a must ask in the interview of large factories .

Today, I sorted out what I had done before and what I interviewed Redis The real questions and answers have been sorted out and shared with everyone . In particular, it is classified , It is convenient for everyone to remember according to the module .

1、Redis Basics

1、 What is? Redis?
2、Redis What are the advantages and disadvantages ?
3、 Why cache Redis?
4、 Why use Redis without map/guava Do the cache ?
5、Redis Why so soon? ?
6、Redis What are the data types ?
7、Redis Application scenarios of ?
8、Redis What are the specific operations and application scenarios of each data type ？
9、Redis How the recycling process works ？
10、 What is the maximum storage capacity of a string type value ？
11、 If Redis There are 1 One hundred million key, Among them is 10w individual key It starts with a fixed known prefix , If you find them all ？
12、 If this redis Providing services for online business , That use keys What's wrong with the instructions ？
13、 Why use redis?
14、 What is distributed lock ？
15、 find redis A large number of key？
16、 How to use redis Do message queuing ？
17、 a large number of key Expire at the same time , What to pay attention to ？
18、 What is cache penetration , Cache breakdown ？
19、redis and memcached What's the difference? ？
20、redis Thread model of ？
21、redis Why single process 、 Single thread is also fast ?
22、redis Expiration strategy ?
23、redis Memory obsolescence mechanism of ？
24、 How to ensure the consistency between cache and database ？
25、redis What is the concurrent competition problem of ？ How to solve this problem ？ understand redis The transaction CAS The plan ？
26、Redis Of LRU How does the algorithm work ?
27、Redis How to ensure high availability 、 What are the cluster modes ？
28、Redis Threading model ?
29、Redis Master slave architecture ？
30、 say something Redis The concept of hash slot ？
31、Redis Are there any write operations lost in the cluster ？ Why? ？
32、Redis How are clusters replicated ？
33、Redis What is the maximum number of nodes in the cluster ？
34、Redis How do clusters choose databases ？
35、Redis It's single threaded , How to improve multicore CPU Utilization ratio ？
36、 How to solve Redis The concurrent competition of Key problem
37、 Distributed Redis Is it done in the early stage or in the later stage ？ Why? ？
38、Redis How to implement delay queue
39、Redis And Memcached The difference between
40、Redis Why doesn't the government provide Windows edition ？
41、 What is the maximum storage capacity of a string type value ？
42、 How to ensure the cache and database double write data consistency ？
43、 How to downgrade cache

2、Redis Memory

1、MySQL Are there in 2000w data ,redis The only known 20w The data of , How to ensure Redis The data in is hot data ?
2、Redis What are the main physical resources consumed ？
3、Redis What happens when you run out of memory ？
4、Redis How to optimize memory ？
5、Redis Why so soon?
6、 How do we observe online Redis Memory ?

3、Redis Partition

1、 What is? Redis Partition ？
2、Redis The advantages of zoning ?
3、 Why do it Redis Partition ？
4、 You know what Redis Partition implementation scheme ？
5、Redis What are the disadvantages of zoning ？
6、 What are the common methods of partitioning ？
7、 Talk about the shortcomings of partition technology ？
8、 Partition technology problem solving ?

4、Redis Business

1、 What is business ？
2、 say something Redis Concept of transactions ？
3、Redis What are the three phases of a transaction ？
4、Redis Transaction related orders
5、 Business management （ACID） summary
6、Redis Does transaction support isolation
7、Redis Is the transaction atomic , Support rollback
8、 say something CAS Mechanism .
9、 What should I do if there is an error in transaction execution ?
10、 Redis Why does transaction not support rollback ?

5、Redis Persistence

1、 What is? Redis Persistence ？
2、Redis What is the persistence mechanism of ？ Advantages and disadvantages of each ？
3、 What are the advantages and disadvantages ？
4、 How to choose the right way to persist ？
5、Redis How to increase the capacity of persistent data and cache ？
6、 What are the deletion strategies for expired keys ？
7、Rediskey How to set the expiration time and permanent validity of ？
8、 redis How to persist ？

6、Redis Typical problem solutions

1、 What is a cache avalanche ？
2、 Cache avalanche solution ？
3、 What is cache penetration ？
4、 Cache penetration solution ？
5、 What is cache breakdown ？
6、 Cache breakdown solution
7、 What is cache degradation ？
8、 Cache hotspot key
9、edis Supported by Java What does the client have ？ Which is the official recommendation ？
10、Redis and Redisson What does it matter ？
11、Jedis And Redisson What are the advantages and disadvantages of comparison ？
12、 How to ensure the cache and database double write data consistency ？
13、 Redis Common performance problems and solutions ？

7、Redis lock

1、 What is? RedLock
2、Redis What are the lock categories ？
3、Redis What is the principle of each lock ？
4、Redis What should I do if I find that the lock has failed ？ Interrupt request or loop request ？
5、 Loop request , If one gets the lock , Others are going to get locks , Is it easy to grab the lock ？
6、 After the lock has expired in advance , client A We're not done yet , And then the client B Got the lock , At this point, the client A performed , Will you delete the lock B My lock has been deleted ？