By Keng Siau
Complicated themes in Database study positive factors the most recent, state-of-the-art learn findings facing all elements of database administration, platforms research and layout and software program engineering. This e-book offers details that's instrumental within the development and improvement of concept and perform on the topic of details know-how and administration of data assets.
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Additional info for Advanced Topics in Database Research, Vol. 1
Consider a ternary relationship R(X, Y, Z) with cardinality 1:1:1 and an imposed binary constraint of M:1 between X:Y. Using the notation identified previously, we can diagrammatically represent this structure, as shown in Figure 2. 26 Jones & Song The explicit constraint between X/Y implicitly suggests the following set of functional dependencies: XY → Z, XZ → Y, YZ → X, X → Y, X → Z, (X → Z is implicitly derived from X → Y and XY → Z. ) According to Table 2 and the CTD rule, we may use a binary decomposition of (XY)(XZ), as shown in Figure 3.
OCB should also prove useful at least for researchers, to benchmark OODB prototypes and/or evaluate implementation techniques. The remainder of this chapter is organized as follows. The de facto standards in objectoriented benchmarking are presented (OO1, HyperModel, and OO7; as well as the Justitia benchmark, which is interesting due to its multi-user approach). Next, the OCB benchmark is described and compared to the other benchmarks. Experiments performed to validate OCB are also presented. The chapter is concluded with future trends.
This supports the observation that a binary decomposition is not always able to enforce functional dependency constraints, even though the decomposition may be lossless. In scrutinizing all potential cardinality outcomes and applying the same functional dependency and decomposition analysis, we find that three additional combinations (Cases 1, 6, 11) cannot be decomposed without losing some level of functional constraint enforcement. Table 3 shows all possible combinations together with their decompositional status regarding functional dependency preservation.
Advanced Topics in Database Research, Vol. 1 by Keng Siau