Any existing fragments with out-of-date column statistics will also be rebuilt at this time.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。
The create date column specifies the date when the database was created, with YYYY-MM-DD being the format.
Create date列是创建数据库的日期,采用YYYY - MM - dd格式。
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