在界定拟建立的数据集的同时,联合土地委员会的一个参数是,公债局有一个固定的子参数调频,具有F、FB、V、VB等可能的数值。 <代码>RECFM=FB在<代码>下调频=F或<编码>上调频频频/VB在<代码>下调取? 哪一种情况倾向于使用RECFM格式?
RECFM没有记录格式。
F是固定长度记录,未锁。 FB是固定长度记录,被封。 锁定在磁盘中储存多份记录,而锁定格式在磁盘中储存一个记录。 一次,磁盘驱动力非常缓慢,无法锁定的格式提供了相对速度,而封隔格式则提供了更好的磁盘使用。 今天,随着现代磁盘驱动,没有利用锁定格式的优势。
五是可变的长度记录,未锁定。 VB是可变的长度记录,受阻。 如果你有可变的长度记录,而不是固定的长度记录,你将使用这些格式。 你们需要在LRECL的最高记录长度中增加4个,以说明创纪录的实地情况。
还有一种特性,即A.使用固定阻挡(FBA)或阻塞变(VBA),这告诉系统,你记录的第一线是打印机控制特性。
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