顾名思义，是自动创建压缩字典的处理过程。
ADC, as named, is the processing whereby a compression dictionary is automatically created.
通过创建压缩的核心映像取代了第1.5阶段。
Replacement of Stage 1.5 with the creation of a compact core image.
对于DB 2 9.5，当数据被加载到事实表时，数据库可以自动创建压缩字典。
From DB2 version 9.5 the database can dynamically create the compression dictionary as data is loaded into the fact table.
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