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 1.GSD global services daemon 
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The Global Services Daemon (GSD) runs on each node with one GSD process per node. The GSD coordinates with the cluster manager to receive requests from clients such as the DBCA, EM, and the SRVCTL utility to execute administrative job tasks such as instance startup or shutdown. The GSD is not an Oracle instance background process and is therefore not started with the Oracle instance. 
GSDÓëracµÄ¹ÜÀí¹¤¾ßdbca srvctl oem½øÐн»»¥£¬ÓÃÀ´Íê³ÉʵÀýµÄÆô¶¯¹Ø±ÕµÈ¹ÜÀíÈÎÎñ¡£ 
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2.LMON: Global Enqueue Service Monitor 
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Global Enqueue Service Monitor (LMON) 
The background LMON process monitors the entire cluster to manage global resources. LMON manages instance deaths and the associated recovery for any failed instance. In particular, LMON handles the part of recovery associated with global resources. LMON-provided services are also known as Cluster Group Services. 
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3.LMD: Global Enqueue Service Daemon 
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Global Enqueue Service Daemon (LMD) 
The resource agent process that manages requests for resources to control access to blocks. The LMD process also handles deadlock detection and remote resource requests. Remote resource requests are requests ori


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