ora.qosmserver

MemoryGuard是一种在集群节点上防止因内存不足导致节点被驱逐的机制,它通过持续监控确保节点可用性。作为J2EE容器中的MBean运行,MemoryGuard在qosm服务器资源上托管,实现高可用性。

Resolving Memory Stress

Memory Guard continuously monitors and ensures the availability of cluster nodes by preventing the nodes from being evicted when the nodes are stressed due to lack of memory.

Memory Guard is implemented as a daemon running as an MBean in a J2EE container managed by Cluster Ready Services (CRS).

Memory Guard is hosted on the qosmserver resource that runs on any cluster node for high availability.

Memory Guard Architecture

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[grid@caiqidb1 audit]$ srvctl status qosmserver
QoS Management Server is enabled.
QoS Management Server is running on node caiqidb2

参考手册:

Autonomous Health Framework User’s Guide

https://docs.oracle.com/en/database/oracle/oracle-database/12.2/atnms/purpose-of-memory-guard.html#GUID-5EBC917F-2810-469D-9DAE-EA6EB2F123D8

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