DB2 for z/OS Architecture in Nutshell
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DB2 for z/OS Architecture in Nutshell Cüneyt Göksu DB2 SME, Information Champion, IBM Gold Consultant CENG497 - DB2 for z/OS Seminar – May 26th 2011 – Middle East Technical University, Ankara 1
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This presentation is specificially prepared for Computer Science Student. It's first presented in METU, Ankara and YTU, Istanbul
Transcript of DB2 for z/OS Architecture in Nutshell
DB2 for z/OS Architecture in Nutshell
Cüneyt Göksu
DB2 SME, Information Champion, IBM Gold Consultant
CENG497 - DB2 for z/OS Seminar – May 26th 2011 – Middle East Technical University, Ankara
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BS, Computer Science, YTU, Istanbul, 1990 MBA, Marmara University, Istanbul, 1992 MS in CS, IIT, Chicago, 1994 20+ years in “Information Management” Technologies 1996 IDUG (International DB2 Users Group) 2004 TDUG (Turkish DB2 Users Group) 2008-2010 IBM Data Champion 2009 IBM Gold Consultant 2011 IDUG BOD
Who am I ?
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Mainframe – Legend Never Ends
•1964: IBM® System/360™
•Obsolete? New trend?
•Trusted for mission-critical data
•Capability to maintain both old and new applications
•SOA (Service-Oriented Architecture) enabled
•z/OS – Most widely used mainframe operating system
•DB2 for z/OS – IBM’s mainframe relational database management system – Since 1983!
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What is DB2 for z/OS?
• Relational Data Base Management System (RDBMS) – Data base consists of tables • Simple concepts
• Dynamic relationships
– Structured query language (SQL) • High level – Data Manipulation Language (DML)
– Data Definition Language (DDL)
– Data Control Language (DCL)
• User specifies WHAT not HOW
– RDBMS facilities • Integrity
• Dynamic definition of DB2 objects
• Active catalog
• Recovery / restart
• Continuous operations
• Security
• Interactive tools
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• DB2 receives MANY requests
from MANY user programs to
access potentially the SAME data
• Besides USER PROGRAMS, DB2
also receives requests from
UTILITIES
Utility
Trx2
Prog2
TSO
Trx1
CICS
Trxb
Trxa
IMS DB2
Utility
BATCH
Prog1
WebSphere Application
Server
Appl2
Appl1
• Distributed
Applications
The system’s view
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The Risks of Database Failures
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Log Time
UPDATE UPDATE DELETE
IMAGE COPY
RECOVER
DISK CRASH
COPY
COPY/RECOVER utilities
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DB2 Data Structures
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DB2 Concurrency Control
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Prog1 Prog2
. . .
UPDATE
COMMIT
SELECT OK
Row
RELEASE LOCK
SHARED LOCK
... WAIT ...
EXCLUSIVE LOCK
DB2 must maintain data integrity and also
provide maximum concurrency
STOP
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EMPLOYEE Table
Data integrity and concurrency
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DB2 Security
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Functional Designer
Programmer
Technical Designer
Database Administrator
System Administration
Security Administrator
Data Administrator
Capacity Planner
z/OS Sysprog
CICS/IMS Sysprog
TP Specialist
Operations
Roles and interfaces in DB2
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Distributed Data Facility
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Location transparency, Scalability, Phased growth, Portability of application
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• Improved availability
• Huge queries feasible
• SYSPLEX hardware required
• Single shared catalog
• Incremental processing growth
• Configuration flexibility
• Dynamic workload balancing
z/OS
DB2 DB2 DB2
DB2 SHARED
DASD DB2
DB2 DB2 DB2
z/OS z/OS
z/OS z/OS
z/OS z/OS z/OS
DB2 for z/OS data sharing
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Q&A
Cüneyt Göksu
DB2 SME, Information Champion, IBM Gold Consultant
CENG497 - DB2 for z/OS Seminar – May 26th 2011 – Middle East Technical University, Ankara
109
