Structure on the fly is very, very hard and RDBMS is very, very entrenched so this will be a long and slow transition;but the decline is inevitable.

• 结构对飞是非常，非常努力和RDBMS的是非常，非常根深蒂固的，所以这将是一个漫长而缓慢的过渡，但下降是无可避免的。