What is Cache memory and how it works ?

The cache or cache memory is a fast, temporary storage that holds frequently used data. It works by storing a copy of frequently accessed data in a small, high-speed memory system so that the CPU can access it quickly instead of having to retrieve it from slower main memory or disk storage.

When the CPU requests data, it first checks the cache. If the data is found in the cache, it is immediately returned to the CPU, which is much faster than accessing the main memory or disk storage.

If the data is not found in the cache, it is retrieved from the main memory or disk storage and placed in the cache for future use.

How cache works in code:

In code, cache works by storing the results of expensive computations or frequently accessed data in a data structure, such as a dictionary, so that it can be quickly retrieved later without having to recompute or re-retrieve it.

cache = {}

def expensive_function(n):
    if n in cache:
        return cache[n]
    result = compute_expensive_result(n)
    cache[n] = result
    return result

In this example, the expensive_function takes a single argument n. If n is found in the cache (stored in the cache dictionary), the cached result is returned immediately.

If n is not found in the cache, the function compute_expensive_result is called to compute the result, which is then stored in the cache and returned.

How cache works in the browser:

The cache works by storing copies of frequently accessed web pages, images and other resources on the user’s computer so that they can be quickly retrieved from the cache instead of being re-downloaded from the internet.

When a user visits a web page, the browser downloads the HTML, images, and other resources that make up the page.

If the user visits the same page again, the browser will check the cache before downloading the resources again.

If the resources are found in the cache, they are immediately loaded from the cache, reducing the amount of data that needs to be downloaded from the internet and improving the page load time.

However, if the resources have changed on the server, the browser will download the updated versions from the internet and replace the older versions in the cache.

The browser cache has limited size, so older resources may be automatically deleted from the cache to make room for new ones.

How cache works in commerce cloud

In a commerce cloud platform, cache works by storing frequently accessed data in a fast, temporary storage system, so that it can be quickly retrieved and returned to the user, instead of having to be retrieved from slower storage systems like databases or file systems.

This can help to improve the performance of commerce sites and applications, especially during periods of high traffic.

In a commerce cloud platform, the cache may store information such as product information, customer data, pricing information, and other data that is frequently accessed.

When a user requests information, the commerce platform will first check the cache to see if the data is already stored there. If the data is found in the cache, it is immediately returned to the user, which is faster than retrieving it from slower storage systems.

If the data is not found in the cache, it is retrieved from the slower storage systems and stored in the cache for future use.

By using cache in a commerce cloud platform, businesses can reduce the load on their storage systems, speed up the performance of their commerce sites and applications, and improve the user experience for their customers.

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