What is the purpose of database read-write separation [easy to understand]

Hello everyone , I meet you again , I'm your friend, Quan Jun .

data Library setting master-slave Library , The main library is used to write data , Query data from multiple repositories .

1. Eliminate conflicts between reading and writing , Improve performance
2. The consistency of master and slave needs to be considered
3. The master and the subordinate are identical , It's using binlog Synchronization , It will be slow 4. Master slave synchronization There are two ideas A、 Semi-synchronous replication , Wait until the copy from the library is successful before returning to write success B、 Set a key Record the data written once , Then set a synchronization time , If at this time , There is a read request , Look at the corresponding key There's no data , Some words , It indicates that the data has been written recently , such key Continue to read the data in the main database , Otherwise, read from the library

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