Spotlight on Oracle 10.9 - Getting Started Guide

Lost Blocks Alarm

Spotlight raises separate alarms for corrupt and lost blocks. The Lost Blocks alarm is raised when the percentage of lost blocks exceeds a threshold as a proportion of total global cache consistent read requests. Possible causes for this alarms are:

• The Cluster Interconnect has been overloaded by an excessive number of block transfers.
• Checksum processes have been disabled, and can no longer identify lost blocks.

Possible solutions to these problems are:

• To upgrade or reconfigure the cluster interconnect.
• To partition tables or segregate application activity to reduce the number of block transfers.

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