AWS RDS的三个指标是什么:可用内存(增强监控)，事件内存(增强监控)和可用内存(CloudWatch监控)？
它们之间是什么关系？
看这两张照片。
三个指标的值不同。
的形象
enter image description here
enter image description here
最佳答案
让我分两部分回答您的问题。
根据official guide
Amazon RDS Enhanced Monitoring — Look at metrics in real time for the operating system.
Amazon CloudWatch Metrics – Amazon RDS automatically sends metrics to CloudWatch every minute for each active database. You are not charged additionally for Amazon RDS metrics in CloudWatch.
意思是，增强的监视功能允许您监视操作系统计数器，而Cloudwatch监视的功能则可以监视每个数据库实例的性能计数器。
Enhanced monitoring info source
可用内存
The amount of unassigned memory, in kilobytes.
事件内存
The amount of assigned memory, in kilobytes.
可用内存
Official Source
The amount of available random access memory.
Units: Bytes
Freeable memory is not a indication of the actual free memory available. It is the memory that is currently in use that can be freed and used for other uses; it's is a combination of buffers and cache in use on the database instance.
关于amazon-rds - RDS : Free Memory,事件内存和可释放内存的三个指标之间有什么关系？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/49190508/