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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) Disk Storage browser “Jolt” Application Server “OS” SQLNet, ODBC,… DBMS Server 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 DBMS Server Database Server Tablespace Instance Table Schema Tablespace Instance Schema Table Schema Table “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