1. DownloadAllMetadataAndFiles (Download metadata from users/queries to database and then download files) 2. DownloadAllMetadata (Download only metadata from users/queries to database) 3.
原子性（A） 一个事务的所有系列操作步骤被看成一个动作，所有的步骤要么全部完成，要么一个也不会完成 ...
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