The read slave technique is the best option for scaling SQL databases. It qualifies as horizontal scaling on the read side, and is transparent to the application.
从库技术是最好扩展SQL数据库的选项，即横向扩展了读，而且可以做到对上层的透明化。
2
The slaveapplication must of course meet a lot of requirements that allow it to run in embedded mode.
仆应用程序当然需要达到很多要求才能在嵌入模式中运行。
3
This paper discusses the application of TWI in the microcontroller, including the communications between master and slave, between the microcontroller and the serial EEPROM.