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MicroSoft SQL-server Some walk through. lv/09-2008 Figures & some text from: © Pearson Education Limited 1995, 2005 2 Functions For a DBMS #1 Data storage,

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Presentation on theme: "MicroSoft SQL-server Some walk through. lv/09-2008 Figures & some text from: © Pearson Education Limited 1995, 2005 2 Functions For a DBMS #1 Data storage,"— Presentation transcript:

1 MicroSoft SQL-server Some walk through

2 lv/ Figures & some text from: © Pearson Education Limited 1995, Functions For a DBMS #1 Data storage, retrieval and update A user-accessible catalogue Transaction support Concurrency control services Recovery services

3 lv/ Figures & some text from: © Pearson Education Limited 1995, Functions For a DBMS #2 Authorization services Support for data communication Integrity services Services to promote data independence Utility services

4 Database – not a single system

5 MS-SQL – Architecture

6

7 Database – Process organisation

8 Databases - system and user

9 lv/ Figures & some text from: © Pearson Education Limited 1995, DBMS: ANSI-SPARC

10 Example

11 lv/ Figures & some text from: © Pearson Education Limited 1995, Description of the 3 levels #1 External Level – Users’ view of the database. – Describes that part of database that is relevant to a particular user. Conceptual Level – Community view of the database. – Describes what data is stored in database and relationships among the data.

12 lv/ Figures & some text from: © Pearson Education Limited 1995, Description of the 3 levels #2 Internal Level – Physical representation of the database on the computer. – Describes how the data is stored in the database.

13 Entity integritet - Normalisering Afværge – Insert anormalitet – Delete anormalitet – Update anormalitet Hvordan – NF1: primær nøgle + kun én værdi i hver ‘celle’ – NF2: NF1 + del af primær nøgle IKKE alene udpege andre felter i rækken – NF3: NF2 + kun primær nøgle udpege felter i rækken

14 Refential Integritet Ved fremmed nøgler – Ved delete eller update Default Null Cascade No Action


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