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1113-AShipalov USF EEL 4852
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  • Title: 1113-AShipalov
  • Type: Notes
  • School: USF
  • Course: EEL 4852
  • Term: Fall

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Processing Query Workflow Inside DBMS Q1: SELECT E.name FROM E, W_O WHERE E.Ssn = W_O.Essn AND E.Bdate < 11/13/78 AND W_O.Pno = 100; R.A: By using a complete set of Equivalence Rules (ERs), we can evaluate all R.A. trees. Query Plan: a query plan is a R.A. tree augmented with algorithms to accomplish R.A. operations. Algorithms for processing R.A. operators 1. SELECTION ( ) Option 1: table scan Option 2: index-based scan Complex selections: selection with condition on more than one attributes. The usage of indexes has profound effect on complex selection in terms of performance. Some Rules: 1) Tree-based index on b, (a, c) only benefits selections on a prefix of (a, b, c) e.g. (a, b); (a); (a, b, c). 2) Hash-based index on whatever set of attributes is only good for exact matches Example: Index(salary) Q1: where salary = 55K; Q2: where salary < 36K AND salary > 30K; 2. PROJECT ( ) Table scan! Do we need duplicates eliminated? What if the answer is YES? 1) sorting-based 2) hashing-based 3. JOIN Option 1: basic nested-loop JOIN Algorithm: for each tuple r in R for each tuple s in S if r and s is a match then (r, s) results I/O cost: M PR N + m Page-based nested-loop join: M N (outer table: R) (inner table: S)

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Path: USF >> EEL >> 4852 Fall, 2009

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Path: USF >> EEL >> 4852 Fall, 2009
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Path: USF >> REU >> 2006 Fall, 2009
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Path: USF >> CLASS >> 6 Fall, 2009
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Path: USF >> CLASS >> 2 Fall, 2009
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Path: USF >> CLASS >> 10 Fall, 2009
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Path: USF >> CLASS >> 9 Fall, 2009
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Path: USF >> CLASS >> 3 Fall, 2009
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Path: USF >> CLASS >> 2 Fall, 2009
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Path: USF >> CLASS >> 9 Fall, 2009
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Path: USF >> CLASS >> 6 Fall, 2009
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Path: USF >> CLASS >> 6 Fall, 2009
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Path: USF >> CLASS >> 6 Fall, 2009
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Path: USF >> CLASS >> 6 Fall, 2009
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Path: USF >> CLASS >> 6 Fall, 2009
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Path: USF >> CLASS >> 6 Fall, 2009
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Path: USF >> CLASS >> 6 Fall, 2009
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Path: USF >> CLASS >> 6 Fall, 2009
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Path: USF >> CLASS >> 6 Fall, 2009
Description: > Design Review form for Senior Project < Reviewer name and email address: _ Project name: Project team members: Brief summary of project requirements: Does the design meet the requirements? If not, explain what is lacking. What is done well in t...
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Path: USF >> CLASS >> 1 Fall, 2009
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Path: USF >> CLASS >> 4 Fall, 2009
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Path: USF >> CLASS >> 1 Fall, 2009
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Path: USF >> CLASS >> 10 Fall, 2009
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Path: USF >> CLASS >> 6 Fall, 2009
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Path: USF >> CLASS >> 6 Fall, 2009
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Path: USF >> CLASS >> 3 Fall, 2009
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Path: USF >> AS >> 07 Fall, 2009
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Path: USF >> AS >> 5 Fall, 2009
Description: Compiler Design (CIS 4930/6930) [Fall 2007] Programming Assignment V Objectives 1. To learn basic typing rules (i.e., static semantics) for object-oriented languages with inheritance and subtyping. 2. To implement an enhanced symbol table for Diminis...
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Path: USF >> AS >> 07 Fall, 2009
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Path: USF >> AS >> 1 Fall, 2009
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Path: USF >> HW >> 5 Fall, 2009
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Path: Wisconsin Milwaukee >> YR >> 4 Fall, 2009
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Path: Wisconsin Milwaukee >> YR >> 4 Fall, 2009
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Path: Wisconsin Milwaukee >> YR >> 4 Fall, 2009
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