©HCCS & IBM® 2008 Stephen Linkin1 Database Management Systems On z/OS Stephen S. Linkin Houston Community College © HCCS and IBM 2008

©HCCS & IBM® 2008 Stephen Linkin2 Database Management Systems For The Mainframe  What Is A Database?  Why Use A Database?  Who Is The Database Administrator?

©HCCS & IBM® 2008 Stephen Linkin3 How Is A Database Designed?  Major Definitions Entities Data Attributes Entity Relationships ORDER Ord No: Ord No: Cust: Cust: Acme Widgets ITEMS 1.Boxes 2.Widgets 3. Coyotes

©HCCS & IBM® 2008 Stephen Linkin4 How Is A Database Designed?  Major Definitions Entities Data Attributes Entity Relationships  Application Functions  Access Paths

©HCCS & IBM® 2008 Stephen Linkin5 What Is A Database Management System?  What Structures Exist In A Relational Database? Database Tables Indexes Keys

©HCCS & IBM® 2008 Stephen Linkin6 What Is DB2?  Data Structures In DB2 Views Table Space Index Space Storage Groups

©HCCS & IBM® 2008 Stephen Linkin7 What Is DB2?  Schema Structures User-defined Data Type (UDT) User-Defined Function (UDF) Trigger Large Object (LOB)  Binary Large Objects (BLOB’s)  Character Large Objects (CLOB’s) Double Byte Character Large Objects (DBCLOB’s) Stored procedure

©HCCS & IBM® 2008 Stephen Linkin8 What Is DB2? System structures  Catalog and directory  Buffer pools  Active and archive logs

©HCCS & IBM® 2008 Stephen Linkin9 What Is DB2?  DB2 Address Spaces System services Database services Lock manager services (IRLM)  Using DB2 Utilities  Using DB2 Commands

©HCCS & IBM® 2008 Stephen Linkin10 What Is SQL?  DML  DDL  DCL

©HCCS & IBM® 2008 Stephen Linkin11 Application Programming For DB2  DB2 program preparation: the flow DCLGEN PRECOMPILE

©HCCS & IBM® 2008 Stephen Linkin12 Application Programming For DB2  DB2 program preparation: the flow DCLGEN PRECOMPILE BIND EXEC SQL SELECT EMPNO, LASTNAME SELECT EMPNO, LASTNAME INTO :EMPNO, :LASTNAME FROM EMP INTO :EMPNO, :LASTNAME FROM EMPEND-EXEC.

©HCCS & IBM® 2008 Stephen Linkin13 Application Programming For DB2  DB2 program preparation: the flow DCLGEN PRECOMPILE BIND RUN

©HCCS & IBM® 2008 Stephen Linkin14 Functions Of The IMS Database Manager

©HCCS & IBM® 2008 Stephen Linkin15 Structure Of The IMS Database Subsystem

©HCCS & IBM® 2008 Stephen Linkin16 Structure Of The IMS Database Subsystem  The IMS Hierarchical Database Model Data Access Sequence

©HCCS & IBM® 2008 Stephen Linkin17 Structure Of The IMS Database Subsystem  The IMS Hierarchical Database Model Data Access Sequence  IMS Use Of z/OS Services  Evolution Of IMS

©HCCS & IBM® 2008 Stephen Linkin18 Summary  Read The Redbook