Spotlight on Oracle 10.8 - Getting Started Guide

Cache Miss Rate Alarm

This alarm is raised when the Global Cache Local Miss Rate exceeds a specified threshold. The Cache Miss Rate is the percentage of time that a block required for a logical read is located in an inconsistent mode on ANOTHER instance in the cluster and must be transferred. Possible causes for this alarm are:

• Hot blocks. A hot block is one that is subject to very high transfer rates and/or latency.
• Excessive cluster co-ordination activity.

Possible solutions to this problem are:

• To partition hot tables.
• To segregate application activity by using services.

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