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This is most likely due to an improper shutdown of your Traverse server or the server running out of disk space. You will need to repair the DGE database by shutting down all Traverse components, opening a command prompt, and executing the following commands (on Windows):
cd <TRAVERSE_HOME>
del logs\error.log
mysql\bin\myisamchk -r database\mysql\aggregateddatadb\*.MYI
Once the recovery task finishes, verify integrity of all the database using the following command:
mysql\bin\myisamchk database\mysql\aggregateddatadb\*.MYI
Then, start all Traverse components and verify that graphs are displayed properly when you navigate through a test in the Traverse interface.