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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.
1

Replikerings- och Klusterlösning för PostgreSQL

Eriksson, Jesper January 2024 (has links)
Många organisationer världen över är i behov av att förmedla data lagrade i databaser till sina kunder samt ta emot information av kunden som lägger till/tar bort data i databasen. Att kunna ha databastjänsterna tillgängliga åt kunden under olika omständigheter och behandla kundens transaktion mot databasen snabbt är något som gynnar organisationen. Detta är särskilt viktigt för den svenska myndigheten Bolagsverket. För detta ändamål kan flera databaservrar interagera med varandra genom replikering, vilket resulterar i ett serverkluster av flera sammankopplade noder. I arbetet utforskades det om servrar med Postgres kan möta myndighetens behov. Målet med arbetet är att utifrån en skapad sammanställning av vilka områden som önskas utforskas, att demonstrera om Postgres har vad som krävs för att möta områdets kriterier och slutligen utvärdera utfallet av demonstrationen. Arbetet resulterade i tre sammanställda områden, totalt 12 implementationer över samtliga områden sammanlagt samt 6 av dem som mötte de kriterier för det område som behandlades. I arbetet tillämpades för samtliga implementeringar en direkt/indirekt fysisk replikering, som bygger på att en av noderna kan skrivas åt i taget där förändringen replikeras direkt till övriga noder. I samband med implementering användes ett flertal av Postgres tillägg och externa utbyggnader. Det beslutades under arbetets förlopp att endast behandla två av dessa områden fullständigt till förmån för utförlighet. Slutsatsen drogs att för de två områdena som behandlades fullständigt så hade Postgres förmågan att möta kriterierna. Dessutom så drogs slutsatsen att om en implementering avsedd för det tredje området kunde möta de sammanställda kriterierna så har Postgres det som krävs för att möta myndighetens behov. / Many organizations worldwide are in need of conveying data stored in databases to their customers as well as receiving information from the customer who adds/deletes data in the database. Being able to have the database services available to the customer in various circumstances and to process the customers transaction against the database quickly is something that benefits the organization. This is particularly of importance for the authority of the Swedish Companies Registration Office (Bolagsverket). For this purpose, several database servers can interact with each other through replication, resulting in a server cluster of several interconnected nodes. The work explored whether servers with Postgres can meet Bolagsverkets needs. The goal of the work consisted of three parts. To define what areas to explore and related mandatory criterias. Create solutions based on the previous step. And finally demonstrate that Postgres has what it takes to meet the areas criterias. The work resulted in three areas, a total of 12 implementations across all areas combined, in of which 6 of them met the mandatory criterias. In the work, a direct/indirect physical replication was applied in all implementations. In physical replication one of the nodes can be written to at a time, where the change is replicated directly to the other nodes. Within implementation, a number of official and external Postgres tools/extensions were used combined with Postgres base functionality. It was decided during the course of the work to treat only two of these areas in full in favor of extensive work. It was concluded that for the two areas that were fully addressed, Postgres had the ability to meet the criterias. In addition, it was concluded that if an implementation intended for the third area could meet the criterias, then Postgres has what it takes to meet the authority needs.
2

Patroni, klienti, příbuzní. Sociální svět Starého Města pražského ve 14. století / Patrons, Clients, and Relatives: The Social World of the Old Town Prague in the 14th Century

Musílek, Martin January 2014 (has links)
The present work focuses on the analysis of two main sources: the court book with market entries (Libri judiciorum or Libri contractuum), and lists of new city residents from the years 1324-1393. The text is divided into several chapters. Besides the description and presentation of the two main types of sources, a critical examination of the basic literature is undertaken, and the methodology of social topography is introduced. An outline of spatial mobility was created, including a basic topographical image of the city and its variations, though an examination of the Old Town real estate markets (especially houses and rural estates). Attention was given to the topographic situation of the Jewish Town, which formed an important part of the medieval urban complex, with coexistence of Christians and Jews within the city. Some aspects of urban migration could be observed, though analysis of the list of new city residents. This is generally regarded not only as an indicator of economic development of the city, but also allows one to monitor the demographic crisis of urban society. Given that a lender had to vouch for each new city resident, lists of new arrivals to the ranks of city burghers also suggest connections and relationships between people. In rare cases, it is possible to link data from the judicial...

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