For each non-NULL variable-length field, the record header contains the length of the column in one or two bytes.
对于每个非空的变长字段,记录头使用一或两个字节包含了列的长度。
The second screen of the TTR contains a field TRANSACTION ID LOCATION that specifies the position of the TBR NAME in the header (in this case, position 8 for a length of 4).
TTR的第二个屏幕显示的是列举记录头中TBR名称的位置的交易号码区域。(在这种情况下,位置8代表4单位长度)。
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