Logical records: The columns in a table are accessed through column names, not record offsets.
逻辑记录：表中的列是通过列名而非记录偏移量来访问的。
In order to give such a file a common physical record length, short logical records are typically "padded" with blanks so that they will all be the same physical record length.
为了让这种档案有一个相同的实体记录长度，短的逻辑记录会用空白填补，因此他们的实体记录长度相同。
As in HDR, the primary server sends all its logical log records to the RS secondary server continuously, except now only in an asynchronous manner.
如同在HDR中一样，主服务器不断将其所有的逻辑日志记录发送给RS备用服务器，不过RS使用的异步方式。
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