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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
31

Implementace paralelního zpracování dotazů v databázovém systému PostgreSQL / Implementace paralelního zpracování dotazů v databázovém systému PostgreSQL

Vojtek, Daniel January 2011 (has links)
CONTENTS vi Title: Implementation of parallel query processing in PostgreSQL Author: Bc. Daniel Vojtek Department: Department of Software Engineering Supervisor: Mgr. Július Štroffek Supervisor's e-mail address: julo@stroffek.cz Abstract: Parallel query processing can help with processing of huge amounts of data stored in database systems. The aim of this diploma the- sis was to explore the possibilities, analyze, design and finally implement parallel query processing in open source database system PostgreSQL. I used a Master/Worker design pattern, in which standard PostgreSQL backend process is a master. As workers I used processes created from postmaster. In the thesis I focused on preparing an infrastructure nec- essary for parallel processing. I defined a new top level memory context over shared memory, which allows efficient and convenient memory al- locations. Then I implemented creation of new worker processes, based on master process requirements. To be able to control these workers I defined controlling structures using state machines. Then I implemented parallel sort operation and SQL operator UNION ALL using this infras- tructure. The result of this diploma thesis is not only implementation of infrastructure and some parallel operations, but also description of the problems encountered during the...
32

Visualizing Aquatic Species Movement with Spatiotemporal Data from Acoustic and Satellite Transmitters

Bajwa, Perabjoth Singh 01 May 2016 (has links)
Tracking an individual specimen can be a difficult task especially when one also has to keep track of the environmental factors that affect the tracked specimen’s behavior. The task of tracking these animals becomes impossible when they become submerged in water and their number increases to more than just one. The aquatic species that are being tracked by this project in Lake Pontchartrain and the Gulf of Mexico are: tarpon, scalloped hammerhead, whale shark, tiger shark, yellowfin tuna, spotted seatrout, redfish, and bull shark. We are tracking these fish using acoustic and satellite transmitters. The insertion of transmitters in the fish was handled by the Louisiana Department of Wildlife and Fisheries biologists. The acoustic transmitters were implanted on smaller fish that only swam in Lake Pontchartrain. Due to this, receivers were only implanted at locations across the lake on various types of attachments such as buoys, PVC pipes, and pilings. These receivers were positioned at more than ninety locations in order to maximize the acquisition of detections. These species were tracked in Lake Pontchartrain and the Gulf of Mexico. After this preliminary setup, a constant batch of data was generated on a regular basis and this data was process by the application developed in this project. A Ruby on Rails application was then setup in order to store this data and manipulate it to display an animated track. The application utilizes: Ruby, Rails, HTML, CSS, SQL, JavaScript and multiple third part libraries. Many optimizations were performed in order to ensure reliability and performance when loading a high volume of fish or if a high volume of users were to use the application.
33

Webbramverk för sökning av heterogen data utifrån single-page sökfunktion / Web framework for searching heterogeneous data by single-page search function

Andersson, Mattias January 2019 (has links)
Detta arbete fokuserar på att utveckla två webbapplikationer i ramverken Django och Node.js tillsammans med Express för att besvara frågan av vilket ramverk som erhåller bäst söktider utifrån en Q&A plattform som använder en PostgreSQL databas vars innehåll är delar av Stack Overflow datasetet. Ramverken jämförs med hjälp av metoden experiment på grund av fördelarna som det erbjuder. Resultatet blev att Node.js gav bättre söktider för ett mindre webbapplikationer medan Django presterade bättre för större webbapplikationer. Genom att halvera storleken av sökresultatens kroppstext till 150 tecken fick Node.js söktider som i snitt var bättre än Django vid större projekt. Antalet sökresultat har en inverkan där vardera ramverk har sina egna intervaller där de ger bäst söktider. Kortsiktigt kan arbetet fortsätta genom att utföra ytterligare mätningar för respektive faktor, långsiktigt kan dessa ramverk jämföras med andra för att se om dessa två ligger bland de bättre eller sämre för denna tillämpningen.
34

Utveckling och design av WiGID

Altayr, Hydar, Adis, Michael January 2003 (has links)
<p>The Center for Genomics and Bioinformatics (CGB) is an academic department at Karolinska Institute. Generally stated, the CGB department is committed to the generation and management of genetic information by approaches aiming at elucidating the connection between genes, protein and function.</p><p>WiGID is a genome information database that is available through WAP (Wireless Application Protocol).</p><p>Our version of WiGID is based on WML, PHP and PostgreSQL as a database server.</p><p>One of the changes on the old WiGID application was the creation of a relational database with seven tables and one view, instead of the file that represented the database on the old version. We also changed the script language from python to PHP.</p><p>The search engine ability has been extended with three new search alternatives for a user to choose from. Each choice leads to other, sometimes multiple choices.</p><p>A GUI has been created for the administrator, to be able to insert information into the database.</p><p>The structure of the search engine is primarily for narrowing down the search result on the phone display, thereby making the search efficient.</p> / <p>Wireless Genome Information Database (WiGID), är en genome information databas och är tillgänglig genom WAP (Wireless Application Protocol).</p><p>WiGID har vidareutvecklats med WML och PHP som skript språk istället för WML och Python.</p><p>Några exempel på den ny utvecklade WiGID är navigationsmöjligheterna och applikationens bakomliggande struktur.</p><p>Modelleringen av relationsbaserade databasen har gett ökad flexibilitet till applikationen. Den är inte längre statisk och svårhanterlig. Hanteringen av databasen har lösts genom inmatnings skriptet. Inmatnings skriptet hanterar information från en fil som den läser ifrån och lägger informationen i respektive tabell.</p><p>Sökmöjligheterna har ökats genom användning av SQL (Structured Query Language). Navigationsmöjligheterna i sökmotorn utökades till sex valmöjligheter istället för tre enligt den äldre versionen. Varje länk går vidare till nya alternativ för att förfina själva sökningen. Sökningen har effektiviserats och valmöjligheterna.</p>
35

High-Availability für ZOPE

Damaschke, Marko 11 June 2005 (has links) (PDF)
Im Rahmen dieser vorliegenden Arbeit soll untersucht werden, welche Möglichkeiten zur Sicherung einer möglichst hohen Verfügbarkeit (High-Availability), Mechanismen zur Lastverteilung mittels des ZEO-Produkts oder ähnlichem sowie welche Strategien des Cachings sinnvoll an einem ZOPE-Server zum Einsatz kommen können. Die Arbeit untersucht dabei die Einsatzmöglichkeiten von bereits vorhandenen und die eventuelle Notwendigkeit der Eigenimplementierung weiterer Produkte der ZOPE-Entwicklung. Den Rahmen der Arbeit bildet die Serverstruktur des Bildungsmarktplatzes Sachsen.
36

Sicheres Verteilen von Konfigurationsdaten und Migrationsstrategie zum Trennen von Diensten und Datenbasis

Wehrmann, Sebastian 01 August 2006 (has links) (PDF)
Aus historischen Gründen war die CSN Datenbank und die darauf zugreifenden Dienste immer auf dem selben Rechner. Zum einen aus Geldmangel, zum anderen, weil die Verteilung der Konfiguration und Zugriffssteuerung zur Datenbank ein ungelöstes Problem ist. Aufgabe dieser Arbeit ist die physikalische und logische Trennung der Firewall (und des Shapers) von der Datenbank. Dazu muss ein Dienst geschaffen werden, der die Konfigurationsinformationen für die Firewall und potentiell andere Applikationen bereitstellt. Der Zugriff auf diese Informationen muss vor Dritten geschützt werden. Im Weiteren soll eine Migrationstrategie entworfen werden, wie der Übergang zu der skizzierten Lösung bewerkstelligt werden kann.
37

High-Availability für ZOPE

Damaschke, Marko. January 2005 (has links)
Chemnitz, Techn. Univ., Studienarb., 2004.
38

A/B-testing for web design: A comparative study of response times between MySQL and PostgreSQL : Implementation of a web based tool for design comparisons with stored images

Lindberg, Tobias January 2018 (has links)
Web development is a challenging task and it’s easy to neglect feedback from users in development stages. That’s why the aim is to create a tool which would help the communication between developers and users by using A/B-testing. The idea is to let developers release two choices containing images, which would be the intended design changes. By letting the users vote for the preferred option, they will be able to provide some feedback for the developers. Response times becomes a critical factor for the tool’s overall success. Therefore, this study compares MySQL and PostgreSQL through a technical experiment to see which database would be the better option regarding the image processing. The experiment indicated that PostgreSQL would the better alternative regarding the subject, as it had the most responsive processing of images. This prototype provides a good foundation for a potentially useful system that could be implemented in future work.
39

Läsa och lagra data i JSON format för smart sensor : En jämförelse i svarstid mellan hybriddatabassystemet PostgreSQL och MongoDB / Read and store data in JSON format for smart sensor : A comparison in response time between the hybrid database PostgreSQL and MongoDB

Edman, Fredrik January 2018 (has links)
Sociala media genererar stora mängder data men det finns fler saker som gör det och lagrar i NoSQL databassystem och smarta sensorer som registrerar elektrisk förbrukning är en av de. MongoDB är ett NoSQL databassystem som lagrar sin data i dataformatet JSONB. PostgreSQL som är ett SQL databassystem har i sina senare distributioner också börjat hantera JSONB. Det gör att PostgreSQL är en typ av hybrid då den hanterar operationer för både SQL och NoSQL. I denna studie gjordes ett experiment för att se hur dessa databassystem hanterar data för att läsa och skriva när det gäller JSON för smarta sensorer. Svarstider registrerades och försökte svara på hypotesen om PostgreSQL kan vara lämplig för att läsa och skriva JSON data som genereras av en smart sensor. Experimentet påvisade att PostgreSQL inte ökar svarstid markant när mängden data ökar för insert men för MongoDB gör det. Svaret på hypotesen om PostgreSQL kan vara lämplig för JSON data är att det är det möjligt att den kan vara det men svårt att svara på och ytterligare forskning behövs.
40

Banco de dados geográfico da arborização de ruas utilizando softwares livres: o caso da cidade de Manaus, Amazonas

Santos, Jairo Rodrigues dos 17 December 2010 (has links)
Made available in DSpace on 2015-04-13T12:17:07Z (GMT). No. of bitstreams: 1 jairo.pdf: 4576085 bytes, checksum: 47f9d28f4f1057b6093eb6378910df7b (MD5) Previous issue date: 2010-12-17 / Currently, several Brazilian municipalities had issues regarding the conditions in which they find their cadastral systems of trees on streets, especially when it comes to city of small and medium businesses, which are commonly found outdated, disorganized and outdated. This work aims to develop a cadastral template tree, analyze and query the database about the trees on the streets by four nonproprietary software for management of Geotechnology and decision trees in the streets of Manaus, using as a study If the neighborhood of the center. In the data acquired in the laboratory for the Study of Landscape UFAM 15 species were identified in a total of 902 trees, the most frequent being: Oiti, Ficus, Flamboian, Castanhola, Manga. Thus, one can conclude that the free software are able to meet the demands of managing street trees. / Atualmente, diversas prefeituras brasileiras apresentaram problemas quanto às condições em que se encontram seus sistemas cadastrais de arborização de ruas, principalmente quando se trata de município de pequeno e médio porte, onde são comumente encontradas defasadas, esorganizada e desatualizada. Este trabalho tem o objetivo de desenvolver um modelo cadastral de árvores, analisar e consultar no banco de dados da arborização de ruas por meio de quatro softwares não proprietárias de geotecnologia para gestão e tomada de decisão na arborização de ruas de Manaus, utilizando como estudo de caso o bairro do Centro. Nos dados adquiridos no laboratório de Estudo da Paisagem da UFAM foram identificadas 15 espécies em um total de 902 árvores, sendo mais frequentes: Oiti, Ficus, Flamboian, Castanhola, Manga. Com isso, pode-se concluir que os softwares livres são capazes de atender as exigências da gestão de arborização de ruas.

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