系统崩溃可能导致写操作时数据效验的不致性。
System crashes can result in inconsistent parity by interrupting write operations.
目录操作包括把新数据保存到目录，搜索和检索保存的数据，删除不需要的数据，更新过时数据，以及类似的操作。
Directory operations include storing new data in a directory, searching for and retrieving stored data, deleting unwanted data, updating obsolete data, and similar operations.
执行这项操作所需的时间取决于出现故障时数据库日志中“打开的”工作量。
The time required to perform this operation depends upon the amount of "open" work in the database logs at the point of failure.
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