New Command Line and Configuration File Parameters

Replication Server 15.0.1 introduces new rs_subcmp parameters that support the use of the hash algorithm.

New Command Line Parameters for Hash Algorithm
Parameter	Description
-h	Perform faster comparison.
-H	Normalize data when using hash algorithm across different platforms or character sets.

New Configuration File Parameters for Hash Algorithm
Parameter	Description
FASTCMP	The same as command line parameter -h. The syntax is: `FASTCMP = Y\|N`. Values are: Y – perform fast comparison using compressed data. N (default) – perform normal comparison as before.
HASH_OPTION	The same as command line parameter -H. The syntax is: `HASH_OPTION = lsb \| msb \| unicode \| unicode_lsb \| unicode_msb`. If this parameter does not exist in the configuration file, by default, rs_subcmp uses the native byte order and character set.

String Options for the H and HASH_OPTION Parameters

String options
Option	Description
`lsb`	All byte-order dependent data is normalized to lsb-first (little-endian) before data compression.
`msb`	All byte-order dependent data is normalized to msb-first (big-endian) byte order before data compression.
`unicode`	Character data is normalized to unicode (UTF-16) before data compression.

Note: UTF-16 string looks very much like an array of short integers and is byte- order dependent, thus Sybase suggests that you use lsb and msb with Unicode for platform independence. For example, use unicode_lsb or unicode_msb.

See Chapter 7, “Executable Programs” of the Replication Server Reference Manual, for more information about rs_subcmp and its parameters.