If so, they still generate a compression dictionary, but in this case, there is no compressed record, as all data has already been moved into the table.

如果有，那么它们仍然生成一个压缩字典，但是在这里，没有被压缩的记录，因为所有数据已经被移到表中。

youdao

Additionally, ADC only occurs if no compression dictionary exists within the physical table data object or partition.

此外，只有当物理表数据对象或分区中没有压缩字典时，才能运行adc。

youdao

The premise behind ADC is to automatically create a representative compression dictionary based on sampling a small subset of table data.

ADC的前提是根据抽样的一小部分表数据自动创建一个代表性的压缩字典。

youdao