In this chapter, we introduced the concept of physical replication. We started by reviewing and deepening our knowledge of WAL segments from previous chapters. We have introduced, seen, and configured an asynchronous physical replica and a synchronous physical replica. We looked at the difference between the two modes and we saw how easy it is to switch from one mode to another. We then explored some useful tools for monitoring replicas and checking their good health.
In the next chapter, we use the concepts that we have discussed in this chapter to address the topic of logical replication.
