RAM cache is a portion of memory made of high- speed static RAM.
随机存储器缓存是由高速静态随机存储器组成的存储器的一部分。
If you have multiple machines, the temptation is to set up a memcached instance on all of your spare machines to provide a massive amount of networked RAM cache storage.
If the data is not copied or duplicated across each instance, what you end up with is 3 GB of RAM cache available to each application server, as shown in Figure 7.