Monitor the Calendar Server log files, including the alarm logs, for any error messages that might indicate database corruption.
You should inspect the log files on a regular basis for ALERT, CRITICAL, ERROR, and WARNING level errors and, if found, examine the events for possible problems with the operation of Calendar Server. The NOTICE and INFORMATION level log events are generated during normal operation of Calendar Server and are provided to help you monitor server activity.
Never remove any transaction log files in the database directory. The transaction log files contain the transaction updates (additions, modifications, or deletions), and removing them can corrupt the calendar database beyond recovery.
When requesting technical support for Calendar Server, you might be asked to provide the log files for help in resolving problems.