Oracle 11g LMon RAC Background Process Functions

  1. LMon (lock Monitor) is one of the mandatory background process in Oracle RAC instance.
  2. It is also called as Global Enqueue Service Monitor
  3. It manages the Global enqueues and resources.
  4. LMON manages the instance and process failures. Which includes the releasing the resources, locks during the abnormal termination of the instance or process.
  5. Cluster Group Services are also managed by LMON.
  6. LMON taking care the registration of database instance with the node monitoring part of the cluster(CSSD).
  7. LMON detects the instance transitions and performs reconfiguration of GES and GCS resources.
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