Any existing fragments with out-of-date column statistics will also be rebuilt at this time.
任何列统计过时的现有片段也将在此时重新构建。
DBDATE: the date column values in the external data file are in the format specified by this DBDATE.
DBDATE:外部数据文件中的日期列值采用由这个DBDATE指定的格式。
For example, a sales table fragmented by transaction date column such that new rows are added each month to store current month sales data.
例如,按照事务日期列分段的销售表,每个月都将添加新的行来存储当月的销售数据。
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