This document discusses caching strategies for beginners. It explains that caching can improve performance by checking the cache server first before reading from the database. It is easy to read from the cache but hard to update as it requires updating both the database and cache. If data is not important, cache updating is not critical, but for important data, keeping the cache updated is important. The document recommends retrying cache updates and using queuing services to batch updates to improve reliability of cache updates.

1. Apply Cache For Beginner #1
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2. Key Value
and
KEY Value
User_ID Profile
- LastLoginTime
- UserName
- ETC

3. Key Value
and
1. Check Cache Server -> Read Cache
2. Read DB -> Write Cache

4. Key Value – Easy to Read
and
1. Check Cache Server -> Read Cache
2. Read DB -> Write Cache

5. Key Value – Hard to Update
and
1. Update To DB
2. Update to Cache

6. What is Hard?

7. Key Value – SYNC Easy
and
Fail!!! 1. Update To DB
2. Fail To Transaction

8. Key Value – SYNC HARD
and
1. Update To DB
Fail!!! 2. Update to Cache

9. Key Value – How
and
1. Update To DB
Fail!!! 2. Update to Cache
RETRY BATCH

10. Data!
The most important thing

11. If data is not important
Cache Updating is not important
Login Count
Last Login Time
ETC

12. BUT!

13. If data is important
Cache Updating is important
Server Address
Data Path
ETC

14. HOW!

15. RETRY!
Retry, Retry, Retry
Solve Over 9x%.

16. Batch!
Queuing Service

17. Error Log
Queue Batch
Error Log Processor
Error Log
Error Log Cache
Error Log Server

18. Error Log
Queue Batch
Error Log Processor
Error Log Error Log
Error Log Cache
Server

19. Error Log
Queue Batch UPDATE
Error Log Processor
Error Log
Error Log Cache
Server
Error Log

20. GEARMAN
BEANSTALKD

21. Thank you!