Download Advances in Spatial and Temporal Databases: 8th by Christian S. Jensen, Torben Bach Pedersen, Laurynas Speičys, PDF

By Christian S. Jensen, Torben Bach Pedersen, Laurynas Speičys, Igor Timko (auth.), Thanasis Hadzilacos, Yannis Manolopoulos, John Roddick, Yannis Theodoridis (eds.)

This e-book constitutes the refereed court cases of the eighth foreign Symposium on Spatial and Temporal Databases, SSTD 2003, held at Santorini Island, Greece in July 2003.

The 28 revised complete papers offered including a keynote paper have been rigorously reviewed and chosen from a hundred and five submissions. the papers are geared up in topical sections on entry tools, complicated question processing, information mining and information warehousing, distance-based queries, mobility and relocating issues administration, modeling and languages, similarity processing, platforms and implementation issues.

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Additional resources for Advances in Spatial and Temporal Databases: 8th International Symposium, SSTD 2003, Santorini Island, Greece, July 2003. Proceedings

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Consider how a page (such as page D3 in Figure 4 (a)) starts to get multiple parent pages. Originally page D3 has only one parent (page I4 in Figure 3 (a)). Version-splitting page I4 at version (1, 25) generates the second parent page (page I5) of D3. When the version-split creates multiple parents, the two paths to the same page (in our case, the two paths are (see Figure 4 (a)) : one path from root page I2 to page D3 going through page I4, the other path from root page I2 to page D3 going through page I5) are separated by the vsh node that is posted after the version-split (in our case, the vsh node is (1, 25) in the root page I2).

Since different paths to a same page v-diverge, (again, if the paths diverge at a ksh node, they do not end at the same page) using the induction method, we can show that VR(path(r, P )) ∩ VR(path(s, P )) = ∅ if r and s are different paths to the same page P . An example is shown in Figure 9 where the version range of the four different paths to the same page D4 from Figure 7 are disjoint. The BTR-Tree: Path-Defined Version-Range Splitting 41 If we split page D4 in such a way that the split-off (the version range that the new page is responsible for) is contained completely in V R(path(r6, D4)), as shown in Figure 9, it is not necessary to post to the other three index pages that the other paths to the same page D4 (path r4, path r5 and path r7) are lying in.

Another example of an openended version range is shown in Figure 1 (b) where (v26 , ∅) is the version range marked by V R3. The branch in V R4 containing v6 , v7 and v8 is an open-ended branch. Hence there is no end version for V R4 on that branch. Of course, at any given instant, V has some precise number of versions, and even an open-ended range is finite. But additional versions can be added on non-terminated paths, so the number of versions in a range can always increase. For example, in Figure 1 (b), if a new version v29 is derived directly from version v28 , the new version v29 is added to range V R3.

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