By percent full
For both warning and critical thresholds, when space used becomes greater than or equal to a percent of total space, an alert is issued.
By free space remaining (in kilobytes (KB))
For both warning and critical thresholds, when remaining space falls below an amount in KB, an alert is issued. Free-space-remaining thresholds are more useful for very large tablespaces.
您应该在此处查看托管表空间警报，尤其是这一点，您可以在其中通过警告和严重阈值这两个标准进行监控。