Expiration dates are recorded for each trace table in the Trace_Directory table and may be modified manually if you want to preserve a particular table longer or eliminate it sooner.

• Trace_Directory表中的每个跟踪表都记录了过期日期;如果您希望将特定的表保留更长时间或者更快地清除该表,则可以手动修改过期日期。