RAC Specific Background Parameters
LMON (Lock monitor / Global Enqueue Service Monitor)
>This is responsible for reconfiguration of lock resource. whenever and instance
joins or leaves the cluster.
>Responsible for dynamic remastering.
>Manages instance and processes expirations and helps GCS for recovery.
LMD (Lock Monitor Daemon/Global Single Service Daemon)
>This daemon handles dead lock detections and remote enqueue request.
LMSN (Lock Manager Server Process)
>This daemons reponsible for shipping of locks whenever cache
fusion request arises.
>These are daemons depends on the parameter GCS_SERVER_PROCESSES
>These daemons manager cross instance call operations for shared resources.
LCP (Lock Monitor Process)
>It Manages requests that are related to library cache and data
DIAG (Diagnostic Monitor)
>Monitors the health of the instance and captures diagnostic information
NOTE: In case of node eviction, we need to dig the diag trace file to understand the root
cause for node eviction .If we rise a service request with oracle
oracle will ask us to upload diag realted trace files.