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RAC CSS CRS EVM

Source: Internet
Author: User
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Since Oracle 10g RAC, Oracle has bound its own cluster software. The initial release version is Oracle cluster ready Service (CRS ). CRS is used as a general term to indicate 《Oracle clusters SoftwareWhen used as a specific term 《Oracle clusters Software. In subsequent releases, Oracle's general CRS was renamed
《Oracle clusterware. 《Oracle clusterwareIs a general term, indicating 《Oracle cluster Software.

Oracle cluster software includes the following components:
Cluster synchronization services (CSS), cluster ready Service (CRS), and event management (EVM ).

CSS manages Oracle cluster members and provides member group services to RAC instances. ----- Cluster synchronization and voting disk management

CRS manages Oracle cluster resources based on configurations, including starting, stopping, monitoring, and Failover of resources. ---- Related to high availability, managing OCR files

The EVM publishes events generated by CRS and can run scripts when a specific event occurs.

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