Contents
What are cache entries?
When a cache line is copied from memory into the cache, a cache entry is created. The cache entry will include the copied data as well as the requested memory location (called a tag). When the processor needs to read or write a location in memory, it first checks for a corresponding entry in the cache.
What are different types of caching systems?
There is three types of cache:
- direct-mapped cache;
- fully associative cache;
- N-way-set-associative cache.
When should caching be used?
A cache’s primary purpose is to increase data retrieval performance by reducing the need to access the underlying slower storage layer. Trading off capacity for speed, a cache typically stores a subset of data transiently, in contrast to databases whose data is usually complete and durable.
What is API caching?
API caching refers to the caching instructions that you set for your entire API. By default, the settings that you configure at this level apply to all resources associated with your API. If desired, API Gateway lets you further customize the downstream and resource-level caching settings.
How is caching used in a web application?
Caching happens at different levels in a web application: CDN is used to cache static assets in geographically distributed servers. It sends the assets faster to the end user from the cache. Database caching is the caching natively used by every database.
What are the design considerations for caching data?
Caching design considerations include data loading/updating, performance/memory size, eviction policy, concurrency, and cache statistics. Data loading into a cache is an important design decision to maintain consistency across all cached content. The following approaches can be considered to load data:
Which is the right candidate for in process caching?
If the application is deployed only in one node, i.e. has a single instance, then in-process caching is the right candidate to store frequently accessed data with fast data access.
When to use caching to avoid repeating computations?
Caching can also be used to avoid repeating computations while the application is running. If an operation transforms data or performs a complicated calculation, it can save the results of the operation in the cache. If the same calculation is required afterward, the application can simply retrieve the results from the cache.