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Thee size of the primary key cannot exceed approximately one database block.
主键大小不能超过一个数据块大小。 。
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A data block is the smallest unit of data used by a database.
数据块是构成数据库的最小数据单位。
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A data block is the smallest unit of data used by a database.
数据块是构成数据库的最小数据单位。
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