MySQL Server Key Cache Use Percent Monitor Monitor

  • ID:  Microsoft.MySQLServer.ManagedServer.Unix.KeyCacheUsePct.Monitor
  • Description:  MySQL Server Key Cache Use Percent Monitor
  • Target:  Monitored MySQL Server (Linux)
  • Enabled:  On Standard Monitoring

Operational States

Name State Description
Under Threshold Success Under Threshold
Over Warning Threshold Warning Over Warning Threshold
Over Error Threshold Error Over Error Threshold

Overridable Parameters

Parameter Name Default Value Description Override
Interval 300 Interval in seconds
Number of Samples 3 Number of Samples
Warning Threshold 70 Warning Threshold
Error Threshold 85 Error Threshold

Alert Details

Monitor State Message Priority Severity Auto Resolution
Over Warning Threshold (Warning) MySQL Server Key Cache Use Percent Medium Match Monitor Health Yes

Run As Profiles

Name
Default

Monitor Knowledgebase

Summary

The percent of the key cache that is currently being utilized. The MyISAM Key cache is a data structure that contains the most-used index blocks. The key cache size is controlled using the global variable ‘key_buffer_size’. The monitor threshold is analyzed against an average of values returned in polls to the agent where the Number of Samples parameter controls the number of samples included in the calculation of the average.

Causes

An unhealthy state indicates the percentage of the key cache in use is high. The key cache does not have enough space to store recently used key blocks and will continue to drop the least recently used key block.

Resolutions

To address high percent use of the key cache increase key_buffer_size the configuration file. This can be done by adding the following line along with size under the instance group options: “key_buffer_size=size”. Alternatively the server can be started with the following option: “--key_buffer_size=size”

External References
This monitor does not contain any external references.

See Also for Open Source Software Preview Management Pack


Downloads for Open Source Software Preview Management Pack

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