Cached memory refers to both cached memory (that is currently usable) and used memory (that ...



Cached memory is a form of memory used by computer systems to store frequently used data, so that the data can be quickly retrieved without the need to access a slower storage device, such as a hard drive. Cached memory is typically stored in a type of random access memory (RAM) known as cache memory.

The use of cached memory results in improved system performance, since it allows the system to access data more quickly than if it had to access the data from a slower storage device. Cached memory is particularly important in systems that require a large amount of data to be accessed quickly, such as a database server.

When discussing cached memory, it is important to understand that there are two types of cached memory: currently usable and used memory. Currently usable cached memory refers to the amount of cached memory that is currently available for use. This is the amount of memory that can be used for storing data.

Used cached memory, on the other hand, refers to the amount of cached memory that has already been used. This is the amount of memory that has been used to store data and is no longer available for use. Used cached memory can be reclaimed once the data stored in it is no longer needed.

When discussing cached memory, it is also important to understand the concept of “cache hit” and “cache miss”. When a system accesses a piece of data, it checks to see if the data is stored in the cached memory. If the data is found, then the system has a “cache hit”. If the data is not found, then the system has a “cache miss”.

The performance of a system can be greatly improved when the number of cache hits is maximized and the number of cache misses is minimized. This can be accomplished by ensuring that the cached memory is large enough to store frequently used data and that the data is accessed frequently.

In summary, cached memory refers to both currently usable and used memory. Currently usable memory is the amount of memory that can be used for storing data. Used memory is the amount of memory that has already been used for storing data and is no longer available for use. The performance of a system can be greatly improved by maximizing the number of cache hits and minimizing the number of cache misses.

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