Daniel Aebi and Reto Largo. Methods and tools for data value re-engineering. In Applications of Databases (ADB-94), volume 819 of LNCS, pages 400--411. Springer, June 1994.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....to extract important structural information. Based on the analysis results, the user can subsequently explore the LSS, and interactively add further semantic abstractions. Examples for such more sophisticated approaches are [HEH 98, KWDE98, Hol98, LO98, Nov97, FHK 97, ONT96, SM95, MAJ94, AL94, MWT94] We call these tools human involved as opposed to human centered, because human knowledge is only considered in the second stage of the supported DBRE process (completion redesign, cf. Figure 2) Finally, we denote CARE tools as human centered, if they enable interactive DBRE processes ....

Daniel Aebi and Reto Largo. Methods and tools for data value re-engineering. In Applications of Databases (ADB-94), volume 819 of LNCS, pages 400--411. Springer, June 1994.

....be worked out. Data mapping, at instance level ( Davi97] Fong97] must also be performed before data is migrated. The possibility of migrating the data in separate steps by dividing the data into independent chunks is also a challenge (see section 3. 5) Legacy data is poor quality data ( Fox94][Aebi94]) therefore a migration project may aim to perform also some data cleaning [Aebi97] The Target System Target System Legacy System Legacy System Method Method Data Division Data Division Schema Mapping Schema Mapping Data Cleaning Data Cleaning Work Flow Work Flow ....

....Interface M Application Module Legacy Data Database Service Legacy Data Database Service Target Data Target Data Mapping Table Mapping Table Figure 3. Composite Database Approach 9 target is the key to overcoming many of the problems posed by legacy information systems ( Brod95][Aebi94]) Thus Butterfly methodology gives particular focus to the migration of legacy data in a mission critical environment. The development of the target system is completely separate to the data migration. Once data migration commences, the legacy data store is frozen to be read only. ....

D. Aebi, R. Largo, 'Methods and Tools for Data Value Re-Engineering', Proceedings International Conference on Applications of Databases. Lecture Notes in Computer Science 819, Springer-Verlag 1994, pp. 499-411.

....libraries) it was decided to use UNIMARC as the data format for the targetsystem. 3 In short, the goal of the project was to extract data from the productive ADABAS database, restructure and possibly correct this data and convert it into UNIMARC. 3 The Three Phase Re Engineering Approach In [Aeb94] we proposed a three phase data re engineering approach consisting of the phases analysis, conversion and correction. To ease the conversion as well as the correction, an intermediate storage of the investigated data has proven useful. For this purpose we decided to choose the relational model to ....

....For this purpose we decided to choose the relational model to describe the intermediate data on a logical level and to use a commercially available DBMS for storing the data. The approach applied here was slightly different because we adopted our model, based on the experiences described in [Aeb94]. Especially the clear distinction between analysis and conversion had to be given up. As a first phase we had to get the data out of the productive system and bring it to some intermediate form, suitable for further processing. This can be a straightforward step if there is enough information ....

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Aebi, D., Largo, R.: Methods and Tools for Data Value Re-Engineering. International Conference on Applications of Databases. Lecture Notes in Computer Science 819. Springer. 1994.

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