handling concurrency in database transactions
Tài liệu Business values, management and conflict handling: issues in contemporary Singapore ppt
... Competing Collaborating Compromising Avoiding Accommodating Production and engineering Competing Collaborating Compromising Avoiding Accommodating Avoiding Accommodating Avoiding Accommodating Information ... Competing Collaborating Compromising Avoiding Accommodating Avoiding Accommodating Avoiding Accommodating Avoiding Accommodating Students Competing Collaborating Compromising Armed forces Competing ... (male) Key : Chinese (female) Competing Collaborating Indian (male) Indian (female) Compromising Avoiding Malay (male) Accommodating Malay (female) Figure Modes of handling conflict in relation...
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Tài liệu Advances in Database Technology- P1 pptx
... Information could be obtained through mining or just from information retrieval Data mining is an important tool in making the web more intelligent That is, data mining may be used to mine the data on ... Defining Privacy for Data Mining, Proceedings of the Next Generation Data Mining Workshop (2002), Baltimore, MD, USA Gehrke, J.: Research Problems in Data Stream Processing and Privacy-Preserving ... with work on information systems engineering involving, for example, databases and web services E Bertino et al (Eds.): EDBT 2004, LNCS 2992, pp 3–16, 2004 © Springer-Verlag Berlin Heidelberg...
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Tài liệu Advances in Database Technology- P2 ppt
... Energy-Conserving Air Indexes for Nearest Neighbor Search Fig Data and Index Organization Using the 51 Interleaving Technique for broadcasting along with the data objects [8] By first examining the index information ... sorted according to the x-dimension since the grid cell is flat Given a query point shown in the figure, nine objects are broken into two lists, with one containing to and the other containing to The ... spatial index over object locations Indexing Queries The second centralized approach to processing spatial continuous queries on moving objects is by indexing queries In this approach a spatial index,...
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Tài liệu Advances in Database Technology- P3 docx
... minimize the information loss in moving from clustering to clustering This information loss is given by We can also view the information loss as the increase in the uncertainty Recall that Since ... Constrained Indexing and Query Indexing are proposed for efficient evaluation of this kind of queries at a central location Several other indexing structures and algorithms for handling moving object ... Leutenegger, and M A Lopez Indexing the positions of continuously moving objects In SIGMOD, 2000 [16] A P Sistla, O Wolfson, S Chamberlain, and S Dao Modeling and querying moving objects In ICDE, 1997 [17]...
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Tài liệu Advances in Database Technology- P4 pdf
... in the second, the intermediate index is based upon plaintext and the final index is obtained by encrypting the intermediate index Based upon characteristics which make encryption efficient in ... conforming to the NSM structure During insertion, a record is split into two sub-records and each is inserted into its corresponding mini-page (sensitive or non-sensitive) As described in Section ... xor-ing them) to obtain ciphertext Decryption involves reversing the process: combining the key-stream with the ciphertext to obtain the original plaintext Along with the initial encryption key,...
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Tài liệu Advances in Database Technology- P5 pdf
... watermark XQzip: Querying Compressed XML Using Structural Indexing 223 XML Structure Index Trees (SITs) In this section we introduce an effective indexing structure called a Structure Index Tree (or ... following information is maintained about each group of records For each attribute we maintain the sum of corresponding values The corresponding value is given by We denote the corresponding firstorder ... Preserving Data Mining 195 data set is a good substitute for privacy preserving data mining algorithms For each dimension pair let the corresponding entries in the covariance matrix for the original...
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Tài liệu Advances in Database Technology- P6 docx
... complexity doing pairwise comparisons of all database objects Focusing on numerical domains [4] was able to gain logarithmic complexity along the lines of [14] Initially skyline queries were mainly intended ... Databases In Proc of the Int Conf on Data Engineering (ICDE’02), San Jose, USA, 2002 J Chomicki Querying with intrinsic preferences In Proc of the Int Conf on Advances in Database Technology (EDBT), ... (such as preceding-sibling and following-sibling) Even more complex are the following and preceding axes Our goal in normalizing the Xpath expression is to bring it to a form in which the only...
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Tài liệu Advances in Database Technology- P7 ppt
... Matching Most database systems allow matching text strings using pseudophonetic Soundex algorithm originally defined in [11], primarily for Latin-based scripts In summary, while current databases ... 5.3 Phonetic Indexing We now outline a phonetic indexing technique that may be used for accessing the nearequal phonemic strings, using a standard database index We exploit the following two facts ... extending the approximate indexing techniques outlined in [1, 21] for creating a metric index for phonemes We are working on an inside-the-engine implementation of LexEQUAL on an open-source database...
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Tài liệu Advances in Database Technology- P8 docx
... Computing and Handling Cardinal Direction Information In general, each multi-tile 333 relation is defined as follows: In Definition notice that for every such that and and have disjoint interiors ... watermark Computing and Handling Cardinal Direction Information 335 Fig Polygon clipping Computing Cardinal Direction Relations Typically, in Geographical Information Systems and Spatial Databases, ... designing the annotation specifications, considering the specifics of data integrity constraint checking, and ascertaining the impact on particular tools remain challenging (and interesting) tasks...
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Tài liệu Advances in Database Technology- P9 docx
... pruning steps using can be done to more effective pruning, since the two sets are symmetric in this join problem Constructing NNH Using Good Pivots Pivot points are vital to NNH for obtaining ... Utilizing Histograms in Queries A typical search involving R-trees follows a branch-and-bound strategy traversing the index top down It maintains a priority queue of active minimum bounding rectangles ... minimum bounding constraint, which increases the general overlap In memory, for instance, RS verifies four times more objects than AC Point-Enclosing Queries Because queries like “find the database...
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Tài liệu Advances in Database Technology- P10 docx
... in different domains, since testing the implication in each domain is easier Now we show that this partitioning idea is feasible We say a comparison X A is in domain D if X and A are in domain ... expensive operation in database queries Indeed, most database queries can be expressed as select-project-join queries, combining joins with selections and projections Choosing an optimal plan, ... projection pushing and join reordering in terms of the treewidth of the join graph (Note that the focus in [28] is on projection pushing in recursive queries; the non-recursive case is not investigated.)...
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Tài liệu Advances in Database Technology- P11 docx
... DS using no more than Let us define SSENC as the sum of squared errors of the data points in block excluding those in its children That is, where is the set of data points in that not map into ... rule or in general on trees satisfying (b) if every node has a sibling This holds in all trees in which (c) if no has a child This holds in all trees satisfying We consider the following decision ... following the reduction from to S2S as explained in [35]: a compass-PDL model is turned into an model by defining and is the first daughter of } and model is turned into a compass-PDL model by defining...
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Tài liệu Advances in Database Technology- P12 docx
... and since each iteration is actually a generalized bargaining step, using a nested bargaining within a bargaining will only increase the number of exchanged messages Experimental Study In order ... computed quickly, in a single pass over the data tuples in in the (arbitrary) order of their arrival At any point in time, our query-processing algorithms can combine the maintained collection ... distinct and independent Assuming and letting denote the corresponding distinct families attached to the atomic sketch for node is simply defined as (again, a randomized linear projection) The final...
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Tài liệu Advances in Database Technology- P13 docx
... state Since the join needs to maintain in its join state the data that has already arrived in order to compare it against the data to be arriving in the future As data continuously streams in, the ... join components, tuning options, sliding windows and to handle n-ary join Extension for supporting sliding window To support sliding window, additional tuple dropping operation needs to be introduced ... June 2002 L Ding, E A Rundensteiner, and G T Heineman MJoin: A metadata-aware stream join operator In DEBS, June 2003 L Golab and M T Ozsu Processing sliding window multi-joins in continuous queries...
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Tài liệu Advances in Database Technology- P14 pdf
... SIGMOD 1997 R Pieringer et al: Combining Hierarchy Encoding and Pre-Grouping: Intelligent Grouping in Star Join Processing ICDE 2003 F Ramsak et al: Integrating the UB-Tree into a Database System ... Garcia-Molina The Demarcation Protocol: A Technique for Maintaining Linear Arithmetic Constraints in Distributed Database Systems In EDBT, 1992 A Cerpa and D Estrin ASCENT: Adaptive Self-Configuring ... Definition 7, by finding all dead states in the intersection automaton of and to determine The set of states, as defined by Definition 8, can also be determined, in linear time, using an algorithm...
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Tài liệu Advances in Database Technology- P15 docx
... window fills up, advancing the end-of-ring pointers and linking new tuples to the main index is cheap as all the pointers are already in place This can be seen in Fig (b), where dotted lines indicate ... to maintain than a LIST without any indices or the T-INDEX For 10000 distinct values, the G-INDEX with 50 groups is faster than the T-INDEX and faster than maintaining a sliding window using LIST ... watermark On Indexing Sliding Windows over Online Data Streams 719 Fig Illustration of the (a) L-INDEX, (b) T-INDEX, and (c) H-INDEX, assuming that the sliding window consists of two basic windows...
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Tài liệu Advances in Database Technology- P16 pptx
... break point The first window opened up to point (point causing excess), making point the cut point; second window opened up to point 11 (8 causing excess) with 10 becoming the cut point etc the ... changes and maintain good levels of resource provisioning for applications Finally, critical areas that involve continuously changing and voluminous spatio-temporal data include intelligent transportation ... present in the original After all, we have obtained that series by discarding data points in the original, and we never invented new data points, let alone time stamps Assume that has data points...
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Tài liệu Advances in Database Technology- P17 doc
... algorithm is shown in Figure First, the constraints are initialized by (i) introducing inverse temporal constraints for existing edges and (ii) assigning “dummy” constraints to non-existing edges The ... the subset of s containing the objects not involved in Finally, V is incrementally extended by performing a left outer join (OR) or inner join (AND) operation with the sub-mapping Please purchase ... the string at is controlled by only symbols with are included in it Figure 2a shows an example sequence and the resulting strings after sliding a window of length The strings are inserted into...
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Tài liệu Advances in Database Technology- P18 pptx
... synopses by intercepting data updates information in the data sources The Workload Manager captures, maintains and analyzes workload information for building, maintaining and testing synopses ... are defined to be those query answers that are true in every repair of a given database instance A repair is a consistent database instance obtained by changing the given instance using a minimal ... exclusion constraints) Allowing union in the query language is crucial for being able to extract indefinite disjunctive information from an inconsistent database (see Example 1) Future work includes...
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Tài liệu Advances in Database Technology- P19 ppt
... synopses by intercepting data updates information in the data sources The Workload Manager captures, maintains and analyzes workload information for building, maintaining and testing synopses ... instance obtained by changing the given instance using a minimal set of insertions/deletions Intuitively, consistent query answers are independent of the way the inconsistencies in the data would ... exclusion constraints) Allowing union in the query language is crucial for being able to extract indefinite disjunctive information from an inconsistent database (see Example 1) Future work includes...
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