9) On leave from 8. The Online Book-keeper (OBK) was developed to keep track of past data taking activity, as well as providing the hardware and software conditions during physics data taking to the scientists doing offline analysis. The approach adopted to build the OBK was to develop a series of prototypes, experimenting and comparing different DBMS systems for data storage. In this paper we describe the implemented prototypes, analyse their different characteristics and present the results obtained using a common set of tests
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