The catalog tree of the system keeps synchronized with the database at the cost of performance.
由于要与数据库保持同步，系统目录树的生成成为项目瓶颈之一。
During backup and restore of file system, it needs to merge current backup resource tree and previous one, namely operations between catalog tree and resource tree.
文件系统备份和恢复过程中，需根据当前备份资源树和历史备份资源树进行合并等操作，这种操作在物理上表现为对目录树和资源树的处理。
During backup and restore of file system, it needs to merge current backup resource tree and previous one, namely operations between catalog tree and resource tree.
文件系统备份和恢复过程中，需根据当前备份资源树和历史备份资源树进行合并等操作，这种操作在物理上表现为对目录树和资源树的处理。
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