The constraining factors for performance are the number of concurrent database connections and available memory (both RAM and disk) in relation to incoming data volume.
性能的限制因素是关于进入的数据量的并发数据库连接的数量和可用内存(RAM和磁盘)。
Because each application that attaches to a database requires some private memory to be allocated, allowing a larger number of concurrent applications will use more memory.
由于需要给连接到数据库的每个应用程序分配一些私有内存，因此允许有更多并发应用程序将意味着用去更多内存。
He explains that concurrent programming is hard just like memory management because you need to balance correctness and performance.
他解释说，并发编程的困难类似于内存管理，你需要平衡正确性和性能。
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