If you check the basic attributes again, in the same way we did earlier, you should see that the last modified time has been altered but the creation time and last access time have remained the same.
如果以前面相同的方式再次检查基本属性，您会发现最后修改时间已被修改，但是创建时间和最后访问时间还保持原样。
To check if a spatial grid index is actually exploited during query time, you should have a look at the access plan.
为检查在查询时是否真正使用了一个空间网格索引，应该查看一下访问计划。
Data possession checking (DPC) is used in networked archival storage to check in real time if the remote server holds a file intact before the actual access to the file occurs.
在网络归档存储中，数据持有性检查(DPC)用来在实际文件访问发生之前实时地检测远端服务器是否仍然完好地持有文件。
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