ditto on the above two comments, especially re: 'flat file' ..
also wanted to add that, as far as i can tell, your foreach/switch loop could be replaced with simply a hash slice assignment: 
@TESS_CONFIG{ qw/
    Data_Directories_fetch
    Data_Directories_erase
    Program_fetch
    Program_erase
    Configuration_and_Table_Files_erase
    Configuration_and_Table_Files_fetch
    Create_Database
    Load_Database
  / } = @HASHES;

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In reply to Re: Dereferencing Mystery by davidrw
in thread Dereferencing Mystery by Anonymous Monk

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