log write-ahead(LWA)

In IMS/VS, the process of writing records of completed operations to the write-ahead data set before entering them in the on-line log data set.; 在虚存信息管理系统(IMS/VS)中,在写完整的运行记录到联机登录数据集之前,先把它们写到超前写数据集中的过程。