May 2018
Intermediate to advanced
576 pages
30h 25m
English
In single-master replication, if the master dies, one of the standbys must take its place. Otherwise, we will not be able to accept new write transactions. Thus, the designations master and standby are just roles that any node can take at some point. To move the master role to another node, we perform a procedure named switchover. If the master dies and does not recover, then the more severe role change is known as a failover. In many ways, these can be similar, but it helps to use different terms for each event.
We use the term clusterware for software that manages the cluster. Clusterware may provide features such as automatic failover, and in some cases, load balancing.
The complexity of failover makes single-master ...