By Alexander Maedche, Steffen Staab, Nenad Stojanovic, Rudi Studer, York Sure (auth.), Brian Read (eds.)
The ever-expanding progress of data expertise keeps to put clean calls for at the administration of information. Database researchers needs to reply to new demanding situations, fairly to the possibilities provided by way of the web for entry to allotted, semi-structured and multimedia facts resources. th This quantity includes the complaints of the 18 British nationwide convention on Databases (BNCOD 2001), held on the Rutherford Appleton Laboratory in July 2001. in recent times, curiosity during this convention sequence has prolonged way past the united kingdom. In choosing simply 11 of the submitted papers for presentation, the programme committee has integrated participants from The Netherlands, Germany, Sweden, Canada and united states. moreover, particularly invited audio system deal with matters of topical curiosity. Our first invited speaker is Professor Dr. Rudi Studer from the college of Karlsruhe. At AIFB, the Institute for utilized Informatics and Formal Description tools, he and his colleagues are within the vanguard of labor at the Semantic net. This goals to make info obtainable to human and software program brokers on a semantic foundation. The paper discusses the position that semantic constructions, in response to ontologies, play in constructing communique among assorted brokers. The AIFB website has been constructed as a semantic portal to function a case study.
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Additional info for Advances in Databases: 18th British National Conference on Databases, BNCOD 18 Chilton, UK, July 9–11, 2001 Proceedings
An additional phenomenon takes effect starting at the d = 3 second case. Because of the jump in UNDO information in the log, there is a corresponding jump in LG main-memory for the transaction related data structures. This is due to the increase in the number of COMMIT TLRs that must be retained as LG. Figures 4(a) and 4(b) show the results for XEL-1 when object size o is varied at 50, 100, 150, 200, and 250 bytes. L main-memory usage is flat since the mainmemory representation of an object is independent of its size (there are the same number of L DLRs in the log for each experiment).
However, since more objects fit into more log space, there is more LG and TG main-memory and log space overhead. D. Regan and A. Delis XEL-2 Results Figures 3(c) and 3(d) show the results for XEL-2 when transaction duration d is varied at 1, 3, 5, 7, and 9 seconds. The L components are the same as in the XEL-1 experiments since the same parameters are used. However, partitioning the log changes the way in which the LG and TG components react. The first thing to notice is that TG main-memory increases as we go from d = 1 to d = 3.
To summarize, GRDs ensure that the log — and ultimately the database — remains recoverable when log records get reordered. GRDs extend the log and main-memory lifetimes of log records. Using GRDs, we can classify log records into four types: live (L), live-garbage (LG), tracked-garbage (TG), and garbage (G). Figure 2 gives an example of all six GRD combinations and their effect on log record lifetimes in XEL. Suppose we have a two-generation XEL log. Transaction t1 updates object o1 and REDO DLR Ro1 t1 and UNDO DLR Uo1 t1 are logged.
Advances in Databases: 18th British National Conference on Databases, BNCOD 18 Chilton, UK, July 9–11, 2001 Proceedings by Alexander Maedche, Steffen Staab, Nenad Stojanovic, Rudi Studer, York Sure (auth.), Brian Read (eds.)