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  2. Two-pass verification - Wikipedia

    en.wikipedia.org/wiki/Two-pass_verification

    Two-pass verification, also called double data entry, is a data entry quality control method that was originally employed when data records were entered onto sequential 80-column Hollerith cards with a keypunch. In the first pass through a set of records, the data keystrokes were entered onto each card as the data entry operator typed them.

  3. Data entry - Wikipedia

    en.wikipedia.org/wiki/Data_entry

    Although most data entered into a computer are stored in a database, a significant amount is stored in a spreadsheet. [17] The use of spreadsheets instead of databases for data entry can be traced to the 1979 introduction of Visicalc, [18] and what some consider the wrong place [19] for storing computational data continues.

  4. Data cleansing - Wikipedia

    en.wikipedia.org/wiki/Data_cleansing

    Data cleansing may also involve harmonization (or normalization) of data, which is the process of bringing together data of "varying file formats, naming conventions, and columns", [2] and transforming it into one cohesive data set; a simple example is the expansion of abbreviations ("st, rd, etc." to "street, road, etcetera").

  5. Data verification - Wikipedia

    en.wikipedia.org/wiki/Data_verification

    Data verification helps to determine whether data was accurately translated when data is transferred from one source to another, is complete, and supports processes in the new system. During verification, there may be a need for a parallel run of both systems to identify areas of disparity and forestall erroneous data loss .

  6. Record locking - Wikipedia

    en.wikipedia.org/wiki/Record_locking

    Record locking is the technique of preventing simultaneous access to data in a database, to prevent inconsistent results. The classic example is demonstrated by two bank clerks attempting to update the same bank account for two different transactions. Clerks 1 and 2 both retrieve (i.e., copy) the account's record. Clerk 1 applies and saves a ...

  7. Data validation - Wikipedia

    en.wikipedia.org/wiki/Data_validation

    Advisory actions typically allow data to be entered unchanged but sends a message to the source actor indicating those validation issues that were encountered. This is most suitable for non-interactive system, for systems where the change is not business critical, for cleansing steps of existing data and for verification steps of an entry process.

  8. Data corruption - Wikipedia

    en.wikipedia.org/wiki/Data_corruption

    This approach allows improved data integrity protection covering the entire data paths, which is usually known as end-to-end data protection, compared with other data integrity approaches that do not span different layers in the storage stack and allow data corruption to occur while the data passes boundaries between the different layers. [19 ...

  9. Data redundancy - Wikipedia

    en.wikipedia.org/wiki/Data_redundancy

    The additional data can simply be a complete copy of the actual data (a type of repetition code), or only select pieces of data that allow detection of errors and reconstruction of lost or damaged data up to a certain level.

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