SharePoint 2010: Event ID 6398, The Execute method of job definition Microsoft.SharePoint.Administration.SPSqmTimerJobDefinition threw an exception

 If you notice the above error in your SharePoint 2010 Farm, the likely culprit is the CEIP (Customer Experience Improvement Program)

Resolution
For completeness it is worth disabling CEIP, first do this as the farm level.

• In Central Administration, select System Settings
• Click Configure privacy options under Farm Management
• Under Customer Experience Improvement Program, select ‘No, I don’t wish to participate’

Next this needs to be disabled for all web applications, including Central Administration.

• Select Application Management, then Manage Web Applications
• Select the first Web Application in the list and click General Settings
• At the very bottom of list, select No in the Enable Customer Experience Improvement Program
• Repeat for all Web Applications in the farm.

In theory, this should be sufficient to disable CEIP across the farm, however running SP1 and the June CU, you will find that the error still appears, therefore the last resort is to disable the Timer Job.

• Click Monitoring then Review  Job Definitions under the Timer Jobs heading.
• In the list, click on CEIP Data Collection.
• At the bottom of the page, click Disable.

The errors will not longer appear and although you could simply just disable the timer job to begin with, I feel it’s better to have the farms configuration set correctly too.