title: AWS RDS MySQL Read Replicas Data Sync time
body: <p>We have and architecture of a scalable web application on AWS and utilized AWS RDS MySQL. They say you have to create 2 Slave Read-Replicas for your MySQL Master db instance. Using this, the master DB will synchronize your data whenever it finds a change (in its master instance) across all of the read replicas. Your application has to split Read and Write operations so that All the Read Requests goes to Read-Replicas (Via a load-balancer or DNS) and write requests\ops goes to the master db.</p>
  
  <p>Now my question is if a user visits a page which has a write operation, he does the operation and click to a page where a Read Operation is required of that new entered data. How much the Master db will take to sync with slave read-replicas so that the user can successfully see the read-operation result (i.e. the newly created record) on the very next page.</p>