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• Green
  • Safe operation
    Its cost is directly proportional
    to the number of records returned
• Yellow
  • Potentially dangerous
    It creates temporary resources.
    If there is sufficient memory its cost is directly
    proportional to the number of record returned
    otherwise to the number of records in the DB.
    It may be a source of eccessive cost
• Red
  • Dangerous operation
    Its cost is directly proportional on the number
    of records in the DB.
    To avoid as a source of excessive cost
• Blue
  • Depending operation
    Its result is not related with
    the number of records returned,
    it needs its associated operations
    for being evaluated
• Pink
  • Not dangerous
    Its cost depends on the number of records
    in the DB, but on a table that has few data by design
• Gray
  • Undefined
    Its cost is unknown because
    the operation hasn't been recognized