A linear data set is a VSAM data set with a control interval size of 4096 bytes to 32,768 bytes in increments of 4096 bytes. An LDS has no imbedded control information in its CI, that is, no record definition fields (RDFs) and no control interval definition fields (CIDFs). Therefore, all LDS bytes are data bytes. Logical records must be blocked and deblocked by the application program?but logical records do not exist from the point of view of VSAM.
IDCAMS is used to define a linear data set. An LDS has only a data component. An LDS data set is just a physical sequential VSAM data set comprised of 4 KB blocks, but with a revolutionary buffer technique called data-in-virtual (DIV).
LDS files are special files used by DB2 and IMS database management systems to store special types of data. They are not generally used on their own for storing business data directly.