You are free to put whatever methods you like in persistence classes -- the registry simply holds instances in memory between different calls to dynamic pages.
您可以很自由地在持久性类中放置您喜欢的任何方法 - 注册表只是在各次对动态页面的调用之间将实例保存在内存中。
Most UNIX systems try to use free memory for caching, which is why it often looks like your system has no free memory.
大多数UNIX系统会尝试用空闲内存执行缓存，这就是系统常常看起来没有空闲内存的原因。
Querying the OS about the amount of free memory may seem like a good idea to evaluate how well your application is performing.
查询操作系统的可用内存量，看起来像一个好主意，以评估您的应用程序是如何更好的执行。
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