Intern
What is a cache?
sobes.tech AI
Answer from AI
Cache is a temporary data storage designed to speed up access to frequently used resources. It stores copies of data from the primary source, such as RAM, disk, or network resource, allowing faster access to this data than from the original source.
Caching is used at various levels:
- CPU Cache: Stores copies of data from RAM for quick access to instructions and data.
- Disk Cache: Stores frequently used disk blocks in RAM.
- Browser Cache: Stores copies of web pages, images, and other web resources on the user's local computer.
- Database Cache: Stores frequently requested data from the database in memory.
- Server-side Cache: Stores results of query executions or generated pages to reduce server and database load.
Advantages of using cache:
- Increased performance: Reduces data access time.
- Reduced load: On the primary data source or system.
- Traffic savings: When caching network resources.
Disadvantages of cache:
- Data staleness (Cache Invalidation): Cache data can become outdated compared to the original source. Mechanisms are needed to maintain data consistency.
- Memory usage: Cache requires additional memory.
Cache management mechanisms include:
- Replacement policies, such as LRU (Least Recently Used), LFU (Least Frequently Used).
- Invalidation mechanisms, such as TTL (Time To Live) or upon changes to the original data.