CRS启动的三个主要的后台进程

最新推荐文章于 2025-11-05 13:50:25 发布

转载最新推荐文章于 2025-11-05 13:50:25 发布 · 197 阅读

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#数据库

本文介绍了Oracle RAC中三个关键组件CRSD、OCSSD和EVMD的功能及作用。CRSD负责高可用操作和应用资源管理；OCSSD提供节点成员访问、群组服务等，并能与现有集群软件集成；EVMD则处理事件生成和调用。

CRSD,OCSSD,EVMD

[@more@]CRSD: - Engine for HA operation - Manages 'application resources'- Starts, stops, and fails 'application resources' over- Spawns separate 'actions' to start/stop/check application resources- Maintains configuration profiles in the OCR (Oracle Configuration Repository)- Stores current known state in the OCR.- Runs as root- Is restarted automatically on failure

OCSSD: - OCSSD is part of RAC and Single Instance with ASM- Provides access to node membership- Provides group services- Provides basic cluster locking- Integrates with existing vendor clusteware, when present- Can also runs without integration to vendor clustware- Runs as Oracle.- Failure exit causes machine reboot. --- This is a feature to prevent data corruption in event of a split brain.

EVMD: - Generates events when things happen- Spawns a permanent child evmlogger- Evmlogger, on demand, spawns children- Scans callout directory and invokes callouts.- Runs as Oracle.- Restarted automatically on failure

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