MD807: Relational Database Management Systems Introduction –Course Goals & Schedule –Logistics –Syllabus Review RDBMS Basics –RDBMS Role in Applications –RDBMS Functions

Course Goals Database Management Concepts –Design, Capabilities, Limitations –Development Process Detailed knowledge of SQL “API” –Managing Data –Manipulating Data –Strong Focus on Reporting Database Application Development –Focus on procedures –Database-oriented web development

Logistics Webpage: www2.bc.edu/~spang Reference Material Syllabus / Schedule Access to the Oracle Software –Isqlplus.bc.edu bcacad3 Project Grading Labs

Syllabus / Sequence Purpose / Need Logical design Physical design Data Management SQL Reporting Procedure development Data/Logic Security Data Integrity and Protection Web Application Environment

BC’s Oracle Software Host Database –Oracle Release 9i tools –BCACAD1 Instance (Rel 8.1) –Userids/passwords iSQLPlus on the web SQLPlus “Thick” Client –Universal Oracle client –Available on BC network SQLLoader HTMLDB –Oracle 10 App Development tool

The DBMS in the Application Environment Web Server Client (Browser) Application Server DBMS Server “Jolt” browser SQLNet, ODBC,… Disk Storage “OS”

Application Development Environment Network Servers Operating System/Subsystems Common System Utilities Common Business Code Application Specific Code

DBMS Application Services Physical Storage of Data Metadata Repository API/Language to manage API/Language to /Use Utilities and Services –Recovery, Performance Usage Management –Sharing

DBMS Application Advantages Single, consistent source of rules for accessing data Shared access for users, processes Insulation from data storage mechanics Increased granularity of access Integrity/recovery functions

The DBMS Server layers DBMS Storage Database Tablespace Table Tablespace Table DBMS Server Server Instance Schema Instance Schema “Mounts”

DBMS Architecture Disk Storage / File System DBMS Application –Server –Instance –Schema Logical Data Constructs –Tablespaces –Tables –Views Clients –SQLNet Heavy Clients –Web Clients

DBMS Operations Starting the Instance Mounting the database Opening the Database Quiescing / Closing the Database

Data Integrity Locking –Allows simultaneous use –Different levels available Logging –Prevent partial updates –Recovery from failures Constraints –Limits on acceptable entries –Discussed in detail later Process

Locking Scenario User A requests record 5 User B requests record 5 User A changes record 5 User A commits changes User B changes record 5 User B commits changes

Data Security Granularity –Filter records –Filter columns Type of Access –E.g. read-only Multiple levels –Database –Table –Function Roles –Groups of privileges –Assignable to individuals

SQL API Defines command syntax –Data Definition –Data Manipulation –Session Management Open Standard Extensions for each vendor

Utilities Import / Export –SQLLOADER Backup / Recovery Administrative tools for DDL/DML Operations Management Gateways

Terminology Review Database Server Database Instance Schema Table-space Table View Column, Row Data type Procedure Set Processing

Preview the Sample Database Login Finding Data Running a request