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

Cuneyt.Goksu@Gmail.com

CENG497 - DB2 for z/OS Seminar – May 26th 2011 – Middle East Technical University, Ankara

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