The Application Programming Interface › How to Use API Member Names › compress

compress

Indicates the compression type. When communicating with an IBM mainframe, if the data file contains any empty lines, COMPRESS can only be set to YES, LZSMALL, LZMEDIUM, or LZLARGE.

Note: All compressions types are not supported on all platforms. For supported compression types, see the partner platform documentation.

COMPACT

RJE compaction algorithm optimized for uppercase English text.

LCOMPACT

RJE compaction algorithm optimized for lowercase English text.

LZLARGE

Activates LZ compression to search back 32K in the data stream for a matching string.

LZMEDIUM

Activates LZ compression to search back 16K in the data stream for a matching string.

LZRW3

General-purpose algorithm that runs fast and gives reasonable compression.

LZSMALL

Activates LZ compression to search back 4K in the data stream for a matching string.

NO

Indicates no compression.

RLE

Run length encoding.

YES

Indicates run length encoding of binary zeros and blanks only.

ZLIB

Greater compression than LZRW3 but less than LZSMALL, LZMEDIUM, and LZLARGE. Equivalent to ZLIB6.

ZLIB(n)

Greater compression than LZRW3 but less than LZSMALL, LZMEDIUM, and LZLARGE. The optional n value can be 1 through 9

Note: The LZ values enable LZ (Lempel-Ziv) compression to replace sequences of data bytes that occur more than once in a data stream with a code value.

Default: YES

compress_pds

The compress_pds parameter controls when a PDS dataset gets compressed for CA XCOM Data Transport z/OS partners that support this functionality. The value of the CMPRS_PDS_ALLOW parameter in the z/OS default table (XCOMDFLT) or destination member (XCOMDFLT) determines if PDS compression is allowed. When this parameter is set to YES, then PDS compression can occur on the CA XCOM Data Transport z/OS partner.

NONE

Suppresses the compression of an output PDS dataset as part of a CA XCOM Data Transport transfer.

BEFORE

The output PDS dataset is compressed before the transfer of user data begins.

AFTER

The output PDS dataset is compressed after the transfer of user data has completed.

BOTH

The output PDS dataset is compressed both before and after the transfer of user data.

Default: NONE

Note: COMPRESS_PDS applies only to PDS data sets that are opened for output as the target of a CA XCOM Data Transport transfer.