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Effective interpretation, integration and querying of web tables

Effective interpretation, integration and querying of web tables

Ngày tải lên : 10/09/2015, 09:09
... values of T1 Title and, respectively, T2 Title, can refer to both movie titles and book titles However, in the context of the values in the other columns in T1 and T2 , it is clear that T1 Title ... usually consists of a set of rows, which are marked up with tag Each table row further consists of a set of cells, tagged with either or The structure and content of a Web table could ... a tag (to distinguish it from the traditional definition of attribute) More specifically, for each table column, we treat each of its matched attribute as a tag, and associate the column with this...
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Query Languages and Data Models for Database Sequences and Data Streams doc

Query Languages and Data Models for Database Sequences and Data Streams doc

Ngày tải lên : 23/03/2014, 12:20
... (CallLength) { TABLE state(ttime); INITIALIZE: ITERATE :{ INSERT INTO state VALUES (time) ; INSERT INTO RETURN SELECT time- ttime FROM state WHERE tag=’end’; INSERT INTO RETURN SELECT ttime -time FROM state ... and to the count The TERMINATE statement returns the ratio between the sum and the count as the final result of the computation by the INSERT INTO RETURN statement2 Thus, the TERMINATE statements ... { TABLE state(tcid Int, tsum Int,tcnt Int); INITIALIZE : { INSERT INTO state VALUES (cid, price, 1);} ITERATE: { UPDATE state SET tsum=tsum+price, tcnt=tcnt+1; WHERE tcid=cid; INSERT INTO state...
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[new] ensuring query correctness and completeness for outsourced databases

[new] ensuring query correctness and completeness for outsourced databases

Ngày tải lên : 29/01/2015, 11:27
... (Completeness)  T nh (Freshness) Môn An Toàn Bảo M t Hệ Thống Thông Tin M t Số Giải Pháp  Chữ ký điện t  Cấu trúc liệu chứng thực (AuthDS – Authentication Data Structure)  Xác su t Môn An Toàn ... Authentication Data Structure)  Xác Su t  Demo Môn An Toàn Bảo M t Hệ Thống Thông Tin Dịch vụ Outsourcing Database  Thông thường, CSDL quản lý t chức sở hữu chúng (in-house database)  T n ... giá trị băm hai node Môn An Toàn Bảo M t Hệ Thống Thông Tin Cấu Trúc Dữ Liệu Chứng Thực (tt)  T nh (Correctness)  Máy chủ cần trả giá trị cần t m VO (Verification Object), t p hợp node trung...
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Query authentication and processing on outsourced databases

Query authentication and processing on outsourced databases

Ngày tải lên : 13/10/2015, 15:54
... each entity may exist • The data owner maintains a master database, and distributes it with one or more associated signatures that prove the authenticity of the database Any data that has a matching ... reveals the existence of extra data points and incurs traffic overhead, but not the actual content of those data points Unless stated otherwise, the following default parameter settings are used: the ... constrained NN query is processed to retrieve the nearest neighbors of q in that region Let the point for Si be pi It turns out that these six points constitute the candidate result set In other...
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Data Warehouse Architecture and Models

Data Warehouse Architecture and Models

Ngày tải lên : 25/04/2013, 20:33
... District_id District_desc District_desc Totsales Totsales Month_id Month_id Store_id Store_id Item_id Item_id Total_dollars Total_dollars Dept Table Dept Table Dept_id Dept_id Dept_desc Dept_desc ... Sales_units Time Table Time Table Week_id Week_id Period_id Period_id Year_id Year_id Item Table Item Table Item_id Item_id Item_desc Item_desc Dept_id Dept_id District Table District Table District_id ... Item Table Item Table Item_id Item_id Dept_id Dept_id Totsales Summary Totsales Summary Month_id Month_id Store_id Store_id Item_id Item_id Total_dollars Total_dollars Snowflake Model Store Table...
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Collecting Data — The Class and the Array

Collecting Data — The Class and the Array

Ngày tải lên : 04/10/2013, 21:20
... example, the following code snippet swaps the location of two Student elements within the array students: Student temp = students[i]; // save off the i’th student students[i] = students[j]; students[j] ... Convert.ToDouble(sAvg); // create a Student from that data Student thisStudent = new Student(); thisStudent.sName = sName; thisStudent.dGPA = dGPA; // add the student object to the array students[i] ... sorted The program then invokes the Sort() function After sorting, the program repeats the output process just to amaze you with the now-sorted result Of course, the key novelty to the SortStudents...
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Data Models, Datasets, and the ADO.NET Interface

Data Models, Datasets, and the ADO.NET Interface

Ngày tải lên : 05/10/2013, 08:48
... 3-10 Steps to add a data table to dataset Click the header of the newly created data table, and name it dtCreditLimit Let’s start adding columns to dtCreditLimit by right-clicking the data table ... will get the dataset ready to bind it with the reporting engine, though, so the next section explains how to use the wizard Creating a Typed Dataset Using the Wizard To demonstrate the use of the ... is to create a typed dataset with a data table inside that has a similar structure to the CreditLimit table What you are going to see now is the common method I’ll use throughout the book to...
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3 Using Data Guard Broker and Enterprise Manager

3 Using Data Guard Broker and Enterprise Manager

Ngày tải lên : 26/10/2013, 20:15
... databases that you add to the configuration • LOCAL_LISTENER on each instance must resolve to an address that is reachable by all members • GLOBAL_DBNAME attribute must be set to a concatenation ... Enhances the high-availability, data protection, and disaster protection capabilities inherent in Oracle Data Guard by automating both configuration and monitoring tasks • Streamlines the process ... configuration using Oracle Net Services • Provides built-in validation that monitors the health of all the databases in the configuration - 16 Copyright © 2006, Oracle All rights reserved Data Guard...
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Oracle Data Guard Concepts and Administration

Oracle Data Guard Concepts and Administration

Ngày tải lên : 26/10/2013, 22:15
... one standby database, but that redo stream is written asynchronously with respect to the commitment of the transactions that create the redo data Maximum performance Introduction to Oracle Data ... Default Behavior for the STARTUP, MOUNT, and OPEN Statements The STARTUP, MOUNT, and OPEN statements have new default behaviors that simplify their use with a physical standby database: – The STARTUP ... Application Clusters Environment Setting Up a Multi-Instance Primary with a Single-Instance Standby Setting Up a Multi-Instance Primary with a Multi-Instance Standby Setting Up a Cross-Instance...
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Data Analysis, Statistics, and Probability

Data Analysis, Statistics, and Probability

Ngày tải lên : 02/11/2013, 17:20
... the formula sheet in the GED Simple interest is a percent of the principal multiplied by the length of the loan: Interest = principal × rate × time Sometimes, it may be easier to use the letters ... occurs the most often ᎏᎏ To change a percentage to a fraction, put the percent over 100 and reduce ■ The mode of a set of numbers is the number that occurs the greatest number of times = = 40% To ... What is its length in scientific notation? Step 1: Move the decimal point to the right until there is one digit other than zero to the left of the decimal .000056 becomes 5.6 Step 2: Count the...
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Designing and Implementing Databases with Microsoft SQL Server 2000 Enterprise Edition

Designing and Implementing Databases with Microsoft SQL Server 2000 Enterprise Edition

Ngày tải lên : 04/11/2013, 16:15
... A Set the data type of the column to uniqueidentifier B Set the data type of the column to int, and set the IDENTITY property for the column C Set the data type of the column to int Create a ... information If this error is encountered, restart the transaction Add the ROWLOCK optimizer hint to the data manipulation SQL statements within the transactions Set the transaction isolation level to ... function that selects the maximum order number in the table D Set the data type of the column to int Create a NextKey table, and add a NextOrder column to the table Set the data type of the NextOrder...
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Data Streams Models and Algorithms- P1

Data Streams Models and Algorithms- P1

Ngày tải lên : 08/11/2013, 02:15
... Velocity Profile A tilted time frame with natural time partition A tilted time frame with logarithmic time partition A tilted time frame with progressive logarithmic time partition Two critical layers ... of the squares of the time stamps Ti, .Tin maintained in is CF 2t The sum of the time stamps Ti, Tin maintained in CFlt is The number of data points is maintained in n E7L=1 e; We note that ... horizon of length h Of course, since it is not possible to store the snapshots at each and every moment in time, it is important to choose particular instants of time at which it is possible to store...
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Data Streams Models and Algorithms- P2

Data Streams Models and Algorithms- P2

Ngày tải lên : 08/11/2013, 02:15
... interval (t, - h, t, ) of length h, at least one integer t' E (t, - h, t, ) must exist which satisfies the property that t' mod 2'-l = and t' mod 2r # Let t' be the time stamp of the last (most ... by using the data about the timestamps stored in the micro-cluster M We note that the timestamp data allows uito calculate the mean and standard deviation3 of the arrival times of points in a ... way that the least recent point should be no larger than a pre-specified number of time units from the current time t, Let us denote this set of points by Q i t Note that since &fit is a part of...
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Data Streams Models and Algorithms- P3

Data Streams Models and Algorithms- P3

Ngày tải lên : 08/11/2013, 02:15
... output attribute At each iteration, the algorithm chooses the attribute with the maximum mutual information and adds a layer with each node represents a different value of this attribute The iterations ... In this model, we are interested in, from a starting timepoint i to the current timepoint t, what are the frequent itemsets In other words, we are trying to find the frequent itemsets over the ... potential frequent 2-itemsets Then, we use the set of potential frequent 2-itemsets and the Apriori property to generate the potential i-itemsets, for i > This approach finds a set of potential...
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Tài liệu Data Streams Models and Algorithms- P4 doc

Tài liệu Data Streams Models and Algorithms- P4 doc

Ngày tải lên : 15/12/2013, 13:15
... (t - ht ,t) We intend to estimate the rate of increase in density at spatial location X and time t by using two sets of estimates: the forward time slice density estimate and the reverse time slice ... estimate measures the density function at a given time t based on the set of data points which will arrive in the future time window (t, t ht) Let us assume that the ith data point in S is denoted ... of the spatial movements of the data over time In order to calculate the nature of the data shift, we would need to calculate the projection of the spatial velocity profiles along this potential...
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Tài liệu Data Streams Models and Algorithms- P5 docx

Tài liệu Data Streams Models and Algorithms- P5 docx

Ngày tải lên : 15/12/2013, 13:15
... 1 Time 24 hours 1111111 111111 qtrs 1 15 minutes 1 1 *-• 1 w Now Figure 6.1 A tilted time frame with natural time partition Figure 6.2 A tilted time frame with logarithmic time partition A natural ... statistics on the number of tuples processed and output by the operator and the total processor time devoted to the operator Based on these statistics, the Statistics Manager can estimate the selectivity ... In the data stream management system STREAM [8], there is a Statistics Manager module that estimates the values of these parameters The query operators in STREAM are instrumented to report statistics...
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Tài liệu Data Streams Models and Algorithms- P6 pdf

Tài liệu Data Streams Models and Algorithms- P6 pdf

Ngày tải lên : 15/12/2013, 13:15
... sum of the sizes of the two buckets and whose timestamp is the timestamp of the more recent of the two buckets, i.e the timestamp of the bucket that is to the right A merger requires O(1) time ... functions that capture the utility of the output to the user: utility as a function either of output latency, or of the percentage loss in tuples, or of the output value of tuples A paper by Tatbul ... (called bucket size) For example, in our figure, a bucket with timestamp and size represents a bucket that contains the two most recent 1's with timestamps and Note that timestamp of a bucket increases...
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Tài liệu Data Streams Models and Algorithms- P7 ppt

Tài liệu Data Streams Models and Algorithms- P7 ppt

Ngày tải lên : 15/12/2013, 13:15
... Survey of Synopsis Construction in Data Streams 189 wish to join attribute A of Rl with attribute B of R2, and attribute C of R2 with attribute D of R3 Let us assume that the join attribute on R1 with ... directly with the sketch representation of the wavelet coefficients rather than the sketch representation of the original data stream Another advantage of the work in [16] is that the query times ... difficulty of intuitive interpretations of sketch based representations, they are sometimes difficult to apply to arbitrary applications In particular, the generalization of sketch methods to the multi-dimensional...
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Tài liệu Data Streams Models and Algorithms- P8 doc

Tài liệu Data Streams Models and Algorithms- P8 doc

Ngày tải lên : 15/12/2013, 13:15
... insertions into the view The sequence ofresulting insertions into the view constitutes the output stream of the streamjoin between S1and S2.The timestamp of an output tuple is the time at which the ... turn out that 99% of the time the extent of packet reordering is limited to a much smaller kt, and that 80% of the time reordering is limited to an even smaller k" Soft, statistical constraints are ... stream tuple in the join state until the tuple will not contribute any more result tuples to the sample Note that not all join result tuples that can be obtained from the join state will actually...
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Tài liệu Data Streams Models and Algorithms- P9 doc

Tài liệu Data Streams Models and Algorithms- P9 doc

Ngày tải lên : 15/12/2013, 13:15
... relation updates (Section 2) Recall that the standard semantics requires the output sequence to reflect the exact sequence of states of the underlying view, which is analogous to the notion of ... complete and strong consistency of a data warehouse view with respect to its source relations [46] The connection does not stop at the semantics The problem of determining what needs to be retained ... DWT respectively Using MBRs instead of individual features exploits the fact that there is a strong spatio-temporal correlation between the consecutive features Therefore, it is natural to extend...
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