'Index blocks' diaporamas de présentation

Benchmarking Index Impact on OLTP Load Rates and Online Database Block Size Rebuilds paper #529

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Chapter 12: Query Processing

Chapter 12: Query Processing. Overview Catalog Information for Cost Estimation Measures of Query Cost Selection Operation Sorting Join Operation Other Operations Evaluation of Expressions Transformation of Relational Expressions Choice of Evaluation Plans.

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Chapter 12: Query Processing

Chapter 12: Query Processing. Overview Catalog Information for Cost Estimation Measures of Query Cost Selection Operation Sorting Join Operation Other Operations Evaluation of Expressions Transformation of Relational Expressions Choice of Evaluation Plans.

759 views • 75 slides

CS 3204 Operating Systems

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File System (Internals)

Dave Eckhardt de0u@andrew.cmu.edu. File System (Internals). Synchronization. P2 grades in .../group-N/grades/p2 Today Chapter 12 (not: Log-structured, NFS). File System Layers. Device drivers read/write(disk, start-sector, count) Block I/O read/write(partition, block) [cached] File I/O

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Lecture 21: Hash Tables

Lecture 21: Hash Tables. Wednesday, November 17, 2004. Outline. Hash-tables (13.4) Note: Used as indexes (far less than B+ trees) Used during query processing (a lot !!). In Class. Suppose the B+ tree has depth 4 and degree d=200 How many records does the relation have (maximum) ?

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Grid systems architecture

FutureGrid Status Report Steven Hand steven.hand@cl.cam.ac.uk Joint project with Jon Crowcroft (CUCL), Tim Harris (CUCL), Ian Pratt (CUCL), Andrew Herbert (MSR), Andy Parker (CeSC). Grid systems architecture. Common themes of self-organization and distribution

280 views • 18 slides