如果将数据库配置成进行前滚恢复，那么就不会将当前存储在数据库日志路径目录中的归档日志移到新的位置。
Archive logs that are currently stored in the database log path directory are not moved to the new location if the database is configured for roll-forward recovery.
如果不提供存储库名称，就会把当前的工作目录转换为存储库。
Not supplying the name of a repository turns the current working directory into a repository.
从另一个存储库检索索引更新，并将其合并到当前分支的文件或目录。
Retrieves index updates from another repository and merges them into the files and directories in the current branch.
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