IS Convert SAM file to temporary ISAM file

IS [:x: | vsn/device | step]

The SAM file/library element displayed on screen is provided with an ISAM key. This is achieved by converting the file to a temporary ISAM file.

ISAM format allows, in addition to 1 to 1 changes, extended editing functions such as copying, inserting and deleting of records, and inserting and deleting column blocks.

Specifying an optional PVS (:x:), or a private disk (vsn/device) will cause the temporary file to be created on the specified PVS or private disk. The :x: or vsn/device parameter is saved, and will be used for all additional conversions, so long as no other values are specified.

step Increment for generating the ISAM key. The standard value for the 8 byte key in the temporary file is an increment of 100. To convert sequential files containing more than 1,000,000 records to a temporary ISAM file, an increment of 10 should be specified in the IS command.

The value for the increment is stored internally, and is used for all subsequent conversions, so long as no other value is specified.

SAM Convert the temporary ISAM file created with the IS command back to its original sequential format.

Terminating the Display Mode by pressing the K1/F1 keys has the same effect as the SAM command. The user is asked if the open ISAM file should be converted back to its original SAM format. If the user does not wish to overwrite the SAM file with the ISAM file, then the SAM file will remain unchanged and the temporary ISAM file will not be erased.