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Title: PowerPoint Presentation Last modified by: ashwini Created Date: 1/1/1601 12:00:00 AM Document presentation format: On-screen Show Other titles
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Distributed Query Processing using different Semijoin operations. Presented By: Jamal Uddin Ahamed Friday,March12,2004 Presentation Outline: 1.Overview. 2.Semijoin ...
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... subset O of S. In the std dynamic pgming algo we perform: O. S-O ... In the join root algo we perform. Note that these plans are stored as plans for S. S-O ...
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1.1 What is distributed database system? A distributed database system is characterized by the distribution of the system components of hardware ,control and data.
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forward lookup. reverse lookup. set oriented. semijoin. customer. orders. normalized logical tree ... Allows set-oriented and reverse lookup plan ...
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Carnegie Mellon Univ. Dept. of Computer Science 15-415 - Database Applications C. Faloutsos Distributed DB General Overview - rel. model Relational model - SQL ...
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6. Distributed Query Optimization Chapter 9 Optimization of Distributed Queries System R Algorithm - Example Find names of employees working on the CAD/CAM project.
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Title: Orthogonal Optimization of Subqueries and Aggregation Author: cesarg Last modified by: S. Sudarshan Created Date: 5/15/2001 4:32:55 AM Document presentation format
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Joins CSC 240 (Blum) * CSC 240 (Blum) * Outer Join: Bringing Back Betty All of the previous Equijoins have been what are called Inner Joins. If a record from one ...
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Carnegie Mellon. Carnegie Mellon Univ. Dept. of Computer ... sunset blvd. johnson. 234. wall str. smith. 123. address. name. ssn. horiz. fragm. vertical fragm. ...
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Title: Author: AMIR Last modified by: admin Created Date: 12/2/2005 12:05:07 PM Document presentation format
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... Subqueries. Mostafa Elhemali, C sar Galindo-Legaria, Torsten Grabs, Milind Joshi ... Integration of special techniques in complete system ...
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Local site maintains objects in its database. Catalog entry may be ... HORIZONTALLY. VERTICALLY. REPLICATED. DEFINE SNAPSHOT. REFRESH SNAPSHOT. MIGRATE TABLE ...
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Introduction to Distributed Databases Yiwei Wu
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... quickly to store inventory information, call tickets, etc. and are tech savvy. HR may adopt slowly as they use many paper forms and are not so tech savvy ...
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... the rows to be transmitted, get the values used in the join from the other table ... Use DepartmentName index to locate addresses of Car records ...
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Title: Text Mining: An Overview Author: Sharma Last modified by: SC Created Date: 7/9/2004 6:12:24 PM Document presentation format: On-screen Show (4:3)
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Difference from a shared-nothing parallel system is in the assumption about the ... That is, R must contain many dangling tuples in its join with S. ...
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Title: Data Mining Engineering Author: Peter Brezany Last modified by: brezany Created Date: 8/2/1995 10:08:02 AM Document presentation format: A4 Paper (210x297 mm)
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DISTRIBUTED DATABASES AND CLIENT-SERVER ARCHITECHURES CONTENTS . Distributed Database Concepts Parallel Vs Distributed ...
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Relational Algebra Archana Gupta CS 157 What is Relational Algebra? Relational Algebra is formal description of how relational database operates.
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Fundamentals of DBMS 4 marks. Distributed Database Design 4 marks ... (Bed) room vs. (Teaching) room (homonyms) 4. Background ...
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Distributed databases ... Mediator. wrapper. wrapper. wrapper. DB. DB ... Storage: database DB is horizontally fragmented, based on branch-name: NYC, ...
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... Division Examples Points To Remember Relational Languages Relational Algebra Assignment Review chapters 1-4, appendix c Read Chapters 5-6 Do Exercise 4.12 (only ...
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Title: Database Design Author: Alon Levy Last modified by: uw Created Date: 1/5/1998 10:52:07 AM Document presentation format: On-screen Show Company
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Integrating Query Processing and Data Mining in Relational DBMSs Qiang Ding (North Dakota State University) William Perrizo (ditto) Victor Shi (ditto)
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Relational Algebra Relational Languages Relational Algebra Relational Languages Procedural language Relational algebra Non-procedural language Relational Calculus (pp ...
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Example: List each employee's first and last name and salary: ... partially compatible, meaning that only some of their attributes, say X, are type compatible. ...
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A Map process turns input tuple R(a,b) into key-value pair (b,(a,R)) and each ... Mapping for 3-Way Join. We map each tuple S(b,c) to ((h(b), h(c)), (S, b, c) ...
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... Green 1 50 105 10 Main Boston. RelAlg: 9. Natural Join Examples. A ... Note: The scheme of the divisor must be a proper subset of. the scheme of the dividend. ...
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Time the best records ever in World Championships. 5. Q1a ... The Olympics and World Record holders are not necessary to be the same athletes. 7 ...
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Difference is idempotent for sets, but not for bags. For sets and bags, R1 R2 = R1 (R1 R2) ... Select is idempotent: sC (sC (R)) = sC (R) ...
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The relational algebra is used to express the output of the query. ... And resp = manager'' EMP(eno, ename, title) ASG(eno, jno, resp, dur) ...
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Title: Database Design Author: dan Last modified by: uw Created Date: 1/5/1998 10:52:07 AM Document presentation format: On-screen Show Company: uw Other titles
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SAL. TITLE ... m4: (SAL 30000) (SAL 30000) Implications (relationships between predicates) ... i4: (SAL 30000) (SAL 30000) Simplification ...
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... compatible. ... and S must be union-compatible. Expressed using basic operations: R ... where there is both a branch office and at least one property for ...
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List the names and comments of all clients who have viewed ... fName, lName(Client)) Client.clientNo = Viewing.clientNo ( clientNo,propertyNo, comment(Viewing) ...
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XML message brokers: central exchange points for messages sent ... The message broker matches data items to queries, transforms them, and routes the results. ...
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System-level details almost certainly are totally incompatible. ... Different names for same relation/attribute. Same relation/attribute name means different things ...
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... are formal languages associated with the relational model. ... Si.a1 q Sj.a2. Si.a1 q c. Can recursively build up formulae from atoms: An atom is a formula ...
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Title: Database Design Author: dan Last modified by: uw Created Date: 1/5/1998 10:52:07 AM Document presentation format: On-screen Show Company: uw Other titles
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Defines a relation consisting of the set of all tuples that are in both R and S. ... 'B) (B.city Paris') Means For all Branch tuples, the city is not Paris' ...
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System R, prototype developed at IBM Research Lab at San Jose, ... Procedural: proscriptive - user tells system how to manipulate data - e.g. relational algebra ...
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Get S#, SNAME, STATUS, and CITY for suppliers who supply part P2 ... Paris. NSP. CITY. Grouping and Ungrouping ... Provides a map between such relations and ' ...
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RELATIONAL ALGEBRA and ... boats: (1) A = sid,bid ... 1005 1 550-0105 1 cid sid F05 S05 F05 sem Arch 501-0105 AI 700-1005 DB 550-0105 subj cid ...
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Parallel world, invent parallel versions of well-known algorithms, mostly based ... Called Volcano query processing model. Standard in commercial systems and ...
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Hack to System R: treat predicates like joins. not an issue with Volcano ... Query sent only to relevant sites. S. Sudarshan: Recent Advances in Query Optimization ...
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... data is located on one site/machine. Semi-Distributed ... Each site surrenders part of its autonomy in terms of right to change ... a site. Network partitioning ...
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The number of tuples in the result of projection list (R) is always less or ... Union of two relations R and S defines a relation that contains all the tuples ...
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... of R, extracting the values of specified attributes and eliminating duplicates. ... all the tuples of R, or S, or both R and S, duplicate tuples being eliminated. ...
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Entities driver, car, tires, doors, engine, seats, piston, valves ... and valves as parts of engine; engine, tires, doors, seats aggregated into car) ...
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de Consultas Distribuidas (2da. Parte) Lic. B rbara da Silva Sistemas de Bases de Datos Distribuidas - UCV Esquema de la Clase Objetivos de la optimizaci n de ...
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Visits(Drinker,Bar); Likes(Drinker,Beer); Serves(Bar,Beer) ... Give all the drinkers that like all beers that John' likes. Likes : ?Beer. ...
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... If data item di appears in fragment Ri, then should not appear in any other fragment. ... Distributed Query Processor (DQP) maps data request into ordered ...
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e.g. grant select on employee(name) to public. Fine-grained access ... and l_shipmode= express' RA would often be ... Reveals that employee has salary = 100K ...
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