The Story About Cache Optimization
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The document discusses how using a cache can improve the performance of database queries, especially for common queries like user login. It provides examples of caching user ID lookups and timelines to return data faster than querying the database directly. While caches can be faster, databases also have caching capabilities, so for very small datasets querying the database directly may be faster. Overall, caches help reduce load on databases and improve response times consistency.
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The Story About Cache Optimization
- 1. The Story About Cache charsyam@naver.com
- 3. Use Case: Login Common Case
- 4. Use Case: Login Common Case Read From DB Select * from Users where id=‘charsyam’;
- 5. Use Case: Login May be it’s genenally fast
- 6. Use Case: Login But it’s Slow In Many Read/Write
- 7. Use Case: Login Advanced Case Read From Cache Get charsyam
- 8. Use Case: Login it’s always fast
- 9. Use Case: Login Memcache VS Mysql 136 vs 1613 seconds
- 10. Use Case: Login 250 million User ID Request 10 million
- 11. Where We Can Use Cache? Just Check User exists? Mail Receive, Tweet Mention Get User’s Profile Get User’s Timeline
- 12. Caches Memcache Redis
- 14. Memcache Atomic Operation Key:Value
- 15. Memcache Atomic Operation Key:Value Single Thread
- 16. Memcache Processing Over 100,000 TPS
- 17. Redis Key:Value
- 18. Redis Key:Value Collection List Sorted Set
- 19. Cache Layer Storage Layer Cache Application READ WRITE Server UPDATE WRITE DBMS
- 20. Cache Layer Like Twitter K: UserID, V: Y/N 1st Level Cache Check User exists K: UserID_TIMELINE, V: Tweet IDs 2nd Level Cache Check tweet list K: UserID_TWEETID, V: Tweet Contents 3rd Level Cache Check Content
- 21. BUTs Sometimes Cache is slower than DB
- 22. Why? DBMS Also Uses Cache If Cache is hit. It’s faster than …
- 23. DBMS Storage Layer Application READ Cache Server DBMS WRITE
- 24. Environment Small Data Sets Read Just 0.2~03mili
- 25. Comparision DB’s Cache: 0.2mili memCache: 0.4mili If you check cache, you spend more time
- 26. BUTs BUTs Cache helps to reduce DBMS’s Loads And It reduces Performance Deviation
- 27. Use Cache!
- 28. Thank you!