The Oracle Service Layer

Besides monitoring the session load on the cluster service and pinpointing issues in load-balancing across cluster instances, this layer monitors the following:

  • The availability and responsiveness of the cluster service;
  • The target and estimated MTTR (Mean Time to Recovery) for every instance;
  • The queries that have been running for a longer duration etc;

layer3tests(1)

Figure 1 : The Oracle Service Layer