提取：从短期历史表读取快照和配置数据。
Extract: Snapshot and configuration data is read from the short-term history tables.
对于卸载，使用SQL query来提取表中的所选数据。
For an unload, an SQL query is used that extracts selected data from the table.
XMLTABLE以关系表的形式提取XML数据。
XMLTABLE extracts XML data in the form of a relational table.
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