RAC Specific Processes (zt)

最新推荐文章于 2021-04-06 14:35:07 发布

转载最新推荐文章于 2021-04-06 14:35:07 发布 · 78 阅读

本文介绍了支持多实例协调的集群中两个关键进程LMON和LMDx的作用。LMON作为全局队列服务监视器，负责管理和监视整个集群的全局队列和服务资源，并处理实例和进程故障及其恢复工作。LMDx则作为锁代理进程，管理全局缓存服务队列请求，控制对全局队列和资源的访问，并处理死锁检测及远程队列请求。

The following are the additional processes spawned for supporting the multi-instance coordination: [@more@]

LMON - The Global Enqueue Service Monitor (LMON) monitors the entire cluster to manage the global enqueues and the resources. LMON manages instance and process failures and the associated recovery for the Global Cache Service (GCS) and Global Enqueue Service (GES). In particular, LMON handles the part of recovery associated with global resources. LMON-provided services are also known as cluster group services (CGS)

LMDx - The Global Enqueue Service Daemon (LMD) is the lock agent process that manages enqueue manager service requests for Global Cache Service enqueues to control access to global enqueues and resources. The LMD process also handles deadlock detection and remote enqueue requests. Remote resource requests are the requests originating from another instance.

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