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Database Management Systems (DBMS)

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Dimara Hakim
Dimara Hakim
TechnologieBusiness
1 von 18
Instructor: Dimara Kusuma Hakim [email_address]
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What Is a DBMS? ,[object Object],[object Object],[object Object],[object Object],[object Object]
Files vs. DBMS ,[object Object],[object Object],[object Object],[object Object],[object Object]
Why Use a DBMS? ,[object Object],[object Object],[object Object],[object Object],[object Object]
Why Study Databases?? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],?
Data Models ,[object Object],[object Object],[object Object],[object Object],[object Object]
Levels of Abstraction ,[object Object],[object Object],[object Object],[object Object],[object Object],Physical Schema Conceptual Schema View 1 View 2 View 3
Example: University Database ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Data Independence * ,[object Object],[object Object],[object Object],[object Object]
Concurrency Control ,[object Object],[object Object],[object Object],[object Object]
Transaction: An Execution of a DB Program ,[object Object],[object Object],[object Object],[object Object],[object Object]
Scheduling Concurrent Transactions ,[object Object],[object Object],[object Object],[object Object]
Ensuring Atomicity ,[object Object],[object Object],[object Object],[object Object]
The Log ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Databases make these folks happy ... ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Must understand how a DBMS works!
Structure of a DBMS ,[object Object],[object Object],[object Object],These layers must consider concurrency control and recovery Query Optimization and Execution Relational Operators Files and Access Methods Buffer Management Disk Space Management DB
Summary ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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Database Management Systems (DBMS)

Hinweis der Redaktion

  1. The slides for this text are organized into chapters. This lecture covers Chapter 1, and is an overview of database systems. The material is standard, with one exception: The discussion of transactions, concurrency control, and recovery is perhaps more in-depth than usual in a first lecture, and this deserves some explanation. Students will (in typical course sequences) not be exposed to this material until much later in the course, and I find it useful for them to have a little background knowledge. This helps, for instance, when explaining why a buffer manager needs to support selective forcing of pages (because write-ahead logging requires it). It is also an important and engaging topic that draws students into the subject immediately. Sometimes, the interactions go so far that I move up the overview material on CC and recovery from Chapter 16, and cover it as Lecture 2! (Note that this can be readily done since Chapter 16 does not rely on any intervening chapters.)