the nine main mysql, linux-msyql copied from the actual depth

1. the basic section tells the mysql master-slave synchronization, here trying to make is, when one request for synchronization in the main library from the library, the main thread is the main library for user name, password verification, after the verification, the request to the I / O thread is responsible for synchronization; after the other from the library sql thread reads the relay log relay.log written to the database will record the location of their writing in the relay.info