Database design 3 (difficult)

Database schema database in bare-Ben era

1. The database server has a single point of issue
2.DB server resources cannot meet growing read-write requests
3. The number of database connections often exceeds the upper limit at peak times

How to solve a single point problem

1. Add additional database server components to the database cluster
2. Database servers in the same cluster must have the same data
3. When any server in the cluster goes down, other servers can replace the outage server

Database design 3 (difficult)