CA Compress/2 › The CA Compress/2 Utilities › Compression Utilities › Compression Statistics

Compression Statistics

The Compression Utilities direct a printed report to the data set defined by the PRINT DD statement. This report contains the following information:

• The DCB information (RECFM, LRECL, and BLKSIZE) of a sequential data set, or the VSAM information (LRECL, cluster type, and, if applicable, the RKP and KEYLEN) for both the INFILE and OUTFILE data sets.
• The data set names of both the INFILE and OUTFILE data sets. These are not printed for dummy data sets.
• The number of records compressed and the number of bytes compressed and produced.
• The shortest, longest and average record lengths, both before and after compression, including the four-byte RDW, if present.
• The average compression percentage (0 = no compression and 100 = total compression), defined as:

  100*X–Y/X

  X = average record length before compression.
  Y = average record length after compression.

• For the SHRINK Utility, the number of type PD, ZL, ZR, S, and X fields which contained information incompatible with the field definition. See the chapter Record Definition for more information on these field types.