More about Extract rules
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After you save an Extract rule, you can test the extraction.
For more efficient operation, execute and extract rule from a Windows or UNIX/Linux command line. See Pega Development Network article PRKB-25747 Running an Extract rule from the Command Line.
Extract rules operate on the BLOB column (Storage Stream) of tables in the PegaRULES database. You can't use extract rules to export data from an external table or database (that has no BLOB column).