Cache
Cache memory is a method of storing data in a computer's main memory so that it may be retrieved quickly. The cache refers to the RAM that is used to store temporary data. Because accessing RAM is much faster than accessing other media such as a hard disk drive or a network, caching allows application exhibits to run more quickly. When an application has a consistent pattern of accessing data that has already been accessed, caching is extremely useful. Caching can also be used to save time-consuming data calculations. The system saves time by preventing the calculation from being recalculated by keeping it in a cache.
What is memory caching and how does it work?
Memory caching works by allocating a chunk of RAM to serve as the cache. When an application attempts to retrieve data from a data storage system such as a database, it first examines the cache to see if the desired record already exists. If it does, the program will read the data from the cache, bypassing the database's slower access. The program reads the record from the source if the desired record is not in the cache. When it obtains that data, it also writes it to the cache so that the program may quickly access it if it is needed again in the future.
What are the advantages and disadvantages of cache memory?
Advantages of cache memory:
Memory cache is faster than main memory.
When compared to main memory, it holds programs that can be executed in a short amount of time. It also uses less access time.
It saves data for later use.
Disadvantages of cache memory:
It is really costly.
The capacity of cache memory is restricted.
Static Cache
When a browser requests a resource, the server that provides the resource can inform the browser how long it should hold or cache the resource temporarily. Static content is any file that is stored on a server and is served to users in the same way each time. This type of information includes HTML files and photos. Every site requires a separate static cache policy. A decent static policy for a website that runs as a public forum with members regularly commenting and updating fresh content will be emptied more frequently than a news item site, for example.
What is the purpose of a static cache?
When material is served, the typical web caching method is for a cache to save a copy of the static file so that it is closer to the user and delivered more rapidly the next time. Static content can be cached by browsers and content delivery networks (CDNs) for a predetermined amount of time and served to users as long as the content is requested. This is feasible because static content does not change over time; users can receive the same file multiple times.
What are the advantages and disadvantages of static caching?
Advantages of static caching :
Lower your overhead: The web server will simply serve the HTML document immediately back to the request on the statically cached page, eliminating the need to generate PHP processes to handle requests to pages on the site. For all click-through traffic, create a "landing page": Instead of using resources to serve the cached page to anyone who visits your homepage or clicks on a link to a specific URL, this method serves the cached page by default, without interfering with the usual operation of the site's other pages.
Disadvantages of static caching A static cache is exactly what it sounds like: it's static. Any changes made to the site will not be reflected on pages cached in this manner. These pages will not display information such as "items in cart" or other data kept in your clients' session files.
How does Asians Cloud CDN caching work?
Content delivery networks rely on the premise that once a piece of content is created, it doesn't need to be created again for a time, therefore a cache copy can be stored. Cache servers are designed to serve small amounts of data rapidly. Caches are often located in data centers all over the world by CDNs. When a user visits a customer's website, they are sent to the nearest cache server to them rather than the customer's actual servers. This means that when a user from Singapore accesses a site from Taiwan, their content is delivered 200-500 ms faster. Cache misses are also mitigated by CDNs. A cache miss occurs when a user requests a piece of content that is not currently in the cache (because it has expired, no one has requested it before, or the cache has become too full and old content has been thrown out).
Cache Management
Caching is a great tool for making your website load faster. Most content in the cache is not likely to stay there indefinitely. They'll have to expire in order for new content to be served. The length of time that content is kept in the cache could be seconds, minutes, or even a year or more. How do you control which of your files are cached, where they are stored, and for how long? The web server sends a set of HTTP headers with your content to execute most caching strategies (as specified in the configuration or the application). Although these headers were created with the client (browser) in mind, Asians Cloud CDN will utilize them as a reference for caching strategy.
Asians Cloud CDN uses only 3 cache-control headers to regulate caching strategies:
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