Despite having a brain no bigger than the tip of your index finger, pigeons have a very impressive visual memory.
尽管鸽子的大脑只有人的食指尖那么大，但它们的视觉记忆力却非常惊人。
It has two parts: a memory address and an index register.
它包括两个部分：一个内存地址以及一个索引寄存器。
Database performance plummets once index tables don't fit in memory anymore, so scale up memory as far as possible to hold tables.
一旦索引表再也无法装入内存，数据库的性能就会直线下降，所以应该尽量升级内存，以便存放那些表。
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