RAC Background Processes

 

There are few additional background processes associated with a RAC instance than you would with a single- instance database. These processes are primarily used to maintain database coherency among each instance. They manage what is called the global resources:1)LMJON: Global Enqueue Service Monitor2)LMD: Global Enqueue Serv ice Daemon3)LMS: Globa] Cache Service Processes,4)LCK: Lock process5)DIAG: Diagnosability process

At the cluster level, you find the main processes of Oracle C’Lusterware. They provide a standard cluster interface on all platforms and perform high-availability operations. You find these processes on each node of the cluster:1)CRSD and RACGIMON: Are engines for high-availability operations2)OCSSD: Provides access to node membership and group services3)EVD: Scans callout directory and invokes callouts in reactions to detected events4)OPROCD i Is a process monitor for the cluster (not used on Linux and Windows)

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