Some info systems process data that is entered into castle in batches indigenous documents. These systems commonly use batch processing. Standard validation checks such as selection and format checks are provided to identify typing errors during data entry, but when data is gone into in batches there room two extra varieties of error the may take place :A file may be accidentally let go out.The data on a paper is entered twice.Batch and hash totals are two distinct validation checks the are supplied when data is gone into in batches to recognize if one of these types of error occurs.Batch Total
Before the information on the records is gotten in the user counts how plenty of documents there are. This is the batch total.As the data is gotten in the computer counts how numerous documents the data is typed from. After the data has actually been entered the complete that was manually calculate is compared to the computer generated total. If the 2 differ climate a file has been missed or some data has been gone into twice.Hash Total
Hash totals are much more sophisticated than batch totals. They can be used to spot missed out or doubly entered documents and can additionally spot more facility errors such as one paper being entered twice in ~ the very same time as another is to let go out. A specific item ~ above the batch of files that must be entered is chosen. E.g. Hrs Worked. The values of this item for each record that is to be input will certainly be added up manually by the user. The full that is calculated is known as the hash total. The data top top the records will climate be entered. The computer will perform the very same totalisation instantly on the favored item. If the computer calculated total and the manually calculated full differ climate a mistake has arisen during data entry. If a batch or hash complete identifies one error then the user will need to go back through every one of the documents, checking which have been entered and which have actually not.ExampleThese three records recording the number of hours worked by the employees at a firm are to be gotten in in a batch (note that in a real device the variety of documents would be larger than this) :
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The computer calculated totals would certainly then it is in :Computer batch total is 3.Computer hash complete on Hours functioned is 117 together 43+37+37=117.Computer hash complete on Worker id is 5476 as 0172+2652+2652=5476.The batch total would no spot the mistake as the number of documents gone into is exactly (3). The hash totals would however spot it as they differ from the user calculated ones.GCSE ICT Companion 04 - (C) ns Meakin 2004