OceanBase 社区版 OCP 功能解读

rm 删除时并非是被真正地擦除，特别是当文件还在被进程打开时，是可以完整地恢复的。 linux 的每个文件对应一个 inode 号，它有两个计数 i_count (内存引用计数，当前使用这个文件的进程数量) 和 i_nlink （磁盘引用计数，硬链接数量）。rm 操作时，把 i_nlink 数量减1 ,但只要 i_nlink 和 i_count 任意一个不为 0 ，该文件并没有被系统删除，所占用的空间不会被回收，占用 df 里面显示的硬盘容量，数据不会被覆盖。

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