'Leaf level' diaporamas de présentation

The Carbon Cycle 2

The Carbon Cycle 2. Introduction: Changes to Global C Cycle (Ch. 15) C-cycle overview: pools & fluxes (Ch. 6) Controls on GPP (Ch. 5) Controls on NPP (Ch. 6) Controls on NEP (Ch. 6).

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Insert, Update & Delete Performance

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Divide and Conquer

Divide and Conquer. Divide and Conquer Algorithms. 1. Partition task into sub-tasks which are smaller instances of the same task 2. Recursively solve the sub-tasks Each sub-task is only solved outright when the bottom (threshold) of the recursion is reached

508 views • 43 slides

SQL Server Performance Tuning(I)

SQL Server Performance Tuning(I). -- SQL Server 2000. Haijun Yang AREC SQL Support Team mailto:hjyang@microsoft.com Feb, 2001. Agenda. Introduction to Optimizing Queries Index Strategies Query Plan Analysis. Overview. Introduction to the Query Optimizer

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Module 12: Optimizing Query Performance

Module 12: Optimizing Query Performance. Overview. Introducing the Query Optimizer Tuning Performance Using SQL Utilities Using an Index to Cover a Query Overriding the Query Optimizer Understanding Indexing Strategies and Guidelines. Lesson: Introducing the Query Optimizer.

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Module 13: Optimizing Query Performance

Module 13: Optimizing Query Performance. Overview. Introduction to the Query Optimizer Obtaining Execution Plan Information Using an Index to Cover a Query Indexing Strategies Overriding the Query Optimizer. Introduction to the Query Optimizer. Function

499 views • 34 slides

SQL Certification Exam

The coverage of testbells 70-433 Q&A are more than 99%.every one you need to learn the complete testbells 70-433 Q&A http://www.testbells.com/70-433.html

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SQL Certification Exam

Testbells Provide 100 % Passing exam 70-433 Microsoft SQL Server 2008, Database Development Exam http://www.testbells.com/70-433.html

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Table Indexing for the .NET Developer

Table Indexing for the .NET Developer. Denny Cherry mrdenny@mrdenny.com twitter.com/ mrdenny. About Me. Independent Consultant Author or Coauthor of 5 books 8 + SQL Mag articles Dozens of other articles Microsoft MVP Microsoft Certified Master VMware vExpert

396 views • 32 slides

Module 6: Creating and Maintaining Indexes

Module 6: Creating and Maintaining Indexes. Overview. Creating Indexes Understanding Index Creation Options Maintaining Indexes Introducing Statistics Using the Index Tuning Wizard. Lesson: Creating Indexes. Guidelines for Creating and Dropping Indexes

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Module 8 Improving Performance through Nonclustered Indexes

Module 8 Improving Performance through Nonclustered Indexes. Module Overview. Designing Effective Nonclustered Indexes Implementing Nonclustered Indexes Using the Database Engine Tuning Advisor. Lesson 1: Designing Effective Nonclustered Indexes. What is a Nonclustered Index?

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Indices

Indices. Advanced Database Systems Dr. Fatemeh Ahmadi-Abkenari. Mechanism for locating Index Entries. Indices. Definition:.

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R-trees: An Average Case Analysis

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LEARNING OBJECTIVES

LEARNING OBJECTIVES. Problems with simple indexing. Multilevel indexing: B-Tree. B-Tree creation: insertion and deletion of nodes. B-tree complexity. Merging and redistribution Advantages of B-trees. Problems related to storing large indexes on the disk.

1.65k views • 19 slides

LEARNING OBJECTIVES

LEARNING OBJECTIVES. Problems with simple indexing. Multilevel indexing: B-Tree. B-Tree creation: insertion and deletion of nodes. B-tree complexity. Merging and redistribution Advantages of B-trees. Problems related to storing large indexes on the disk.

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Indexing

Indexing. Data Organization & Indexing. Constraints imposed by disk architecture Seek time, rotational latency, transfer time Basic unit of data transfer: a page or block Comparison: Heap versus sorted files Heap files: simply append at end

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Quadtrees

Quadtrees. 1. Split along pre-defined planes Used to partition 2-D space In general, a quadtree is a tree in which each node has at most 4 children Each node of the tree corresponds to a square region

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MIS 3500 * Exercise: B+Tree with degree of 3 - Soluation

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MIS 3500 * Exercise: Creating B+Tree (Updated 2014)

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DIFFERENCE BETWEEN REBUILDING AND REORGANIZING INDEXES

You can remedy index fragmentation by reorganizing or rebuilding an index. It is prudent to know the differences between the two:

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