For multiple index push-downs, multi-index scan is used to combine RIDs from different index scans, then skip-scan on the fact table is performed.
对于多索引下推，多索引扫描用于组合来自不同索引扫描的RID，然后就可以执行对事实表的跳跃式扫描了。
The MGRNO field is actually a link back to the EMPLOYEE table, and we'll deal with that in a minute when adding associated, so skip that field as well.
MGRN o字段实际上是一个连接回employee表的链接，我们将在添加关联元素时立刻处理它，因此现在可以跳过该字段。
Ext4 marks unused groups of blocks within the inode table to allow the FSCK process to skip them entirely to speed the check process.
ext4将未使用的块组标记到inode表中，并让fsck进程忽略它们以加快检查速度。
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