anchor.diff:  ====== Analyze Data Size
   
   * Are some parts of the data especially large?
  -* Does the relation between record-size (_how large is a single record_?)
  +* Is the relation between record-size (_how large is a single record_?)
   and record-volume (_how many records exists_?) plausible?
  -
  +* Do critical queries involve especially large parts of data?
   
   ====== Analyze Data Validation
   
  
positive.code: become invalid every year.    
  --
  
  
negative.code: * Data Validation
  * Data Size
  * Data Actuality and Correctness
  * Data Access Protection
  * Backup
  
  ====== Analyze Data Structures
  Are data structures suited to represent the problem domain?
  