Database Hash Comparison

The database_hash comparison option is supported only for Adaptive Server-to-Adaptive Server comparisons.

As the Adaptive Server hashbytes function does not accept large objects (LOB) datatypes as a parameter, neither does the database_hash column comparison option support those datatypes (such as text, image, and unitext).

Adaptive Server supports the hashbytes function only in version 15.0.2 and later. If your source or target database is earlier than 15.0.2, you cannot use the database_hash option.

• Database Hash and Default Column Compare Modes
  Use the column_option_helper_visit_db configuration option to allow DA to verify and, if necessary, amend the default column compare modes for a comparison, when the hash_type comparison option is set to database_hash.