LMON
From Oracle FAQ
LMON (Lock MONitor) is an Oracle background process created when you start a database instance in RAC mode. The LMON process manages global locks and resources. It is also callded Global Enqueue Service Monitor. It monitors all instances in the cluster primarily for dictionary cache locks and library cache locks and dead locks on deadlock-sensitive equeues and resources. LMON also provides Cluster Group Services.
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