DB2 UDB for z/OS Version 7 - An Overview

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DB2 UDB for OS/390 Version 7

An Overview

Craig S. MullinsDirector, DB2 Technology PlanningBMC Softwarehttp://www.bmc.com

Visit Craig’s web site at:

http://www.craigsmullins.com


Agenda

DB2 and S/390 Status CheckDB2 V7 Enhancements e-Business Application Data Management Business Intelligence Family Compatibility Other New Features

Trends for the FutureSummary


S/390 Status Check

S/390 rebranded as zSeries 900 runs OS/390, Linux, and z/OS

OS/390 becomes z/OS 64 bit 99.999% up time Workload License Manager Continued Investment in Mainframe


Where does S/390 play?

>70% of data still resides on S/390 > 95% of S/390 data will be front-ended to the web >80% of IMS and CICS applications will be front-ended to the web 20-35% S/390s will become web-servers


DB2 Status Check

DB2 licenses growing 25% annually since 1996 10,000+ licenses as of end of 1999

Complex environments More components, applications, data

Parallel Sysplex - scalability but not availability

Staffing Shrinking pool of available talent

e-Business shrinks maintenance windows No longer a “batch” window - 24x7x366


DB2: Where are we Now?

According to IBM (Dan Wordman [IBM], IDUG May 2000)

50% of IBM’s DB2 Customers are using Version 5 in production

20% have Version 6 in house (at least testing)

More and more shops are beginning to move to DB2 V6 now Year 2000 scare is past us Version 6 Refresh / RML (2Q2000) More stability

Version 7 is just around the corner...


Too Much, Too Quick?

New functionality in DB2 V5 and V6 delivered through APARs:

http://www.software.ibm.com/data/db2/os390/v5apar.html http://www.software.ibm.com/data/db2/os390/v6apar.html

Identity Columns JavaStoredProcedures

REXX Languageand Stored

Procedures

REBUILDINDEXUtility

More than

15 Tables

in a Join

SQLJ Support

SQL ProcedureLanguage

Index Screening for List Prefetch


DB2 Version 7

E-Business Enhancements

E-busi-ness (e’biz’nis) The transformation of key business processes through the use of Internet technologies.


What is XML?

XML stands for eXtensible Markup Language.

Like HTML, XML is based on SGML(Standard Generalized Markup Language)

HTML uses tags to describe the appearance of data on a page, whereas XML uses tags to describe the data itself, instead of its appearance.

Allows documents to be self-describing, through the specification of tag sets and the structural relationships between the tags.

XML is a meta language - a language used to define other languages; these languages are collected in dictionaries called Document Type Definitions (DTDs).

The DTD stores definitions of tags for specific industries or fields of knowledge. So, the meaning of a tag must be defined in a DTD before it can be used. The DTD for an XML document can be either part of the document or stored in an external file.


XML Extender

A new data type extender for XML documentsLike Video, Image, Audio, and Text ExtendersCombine UDT, UDFs, and triggers for functionality

XML document stored in a column -or-XML components stored as parts of multiple

columns in multiple tablesCan formulate XML documents from existing

DB2 tablesCan search XML documents text and sectionsUDTs for XML: XMLVARCHAR and XMLCLOB


Net.Data Enhancements

Built-in XML exploitationGenerate XML tags as output

from Net.Data macrosUse XML style

sheet to format and display the generated output


DB2 Version 7

Application-Related Enhancements


Stored Procedure Enhancements . . .

Stored Procedure Builder

Point and click environment for building stored procedures Supports the entire DB2 Family

Can build stored procedures on a workstation for deployment on OS/390

Will support SQL Procedure Language and Java Works as:

a Microsoft Visual Studio plug-in

with Microsoft Visual Basic

with IBM VisualAge

as a stand-alone SP development environment


SQL Procedure Enhancements . . . SQL Procedure Language:

Enables stored procedures to be written in extended, procedural SQL: Assignment statements

CASE - LEAVE

Cursors

IF - THEN - ELSE

Local variables

LOOP, REPEAT, and WHILE

FOR, CALL, and RETURN

SIGNAL and RESIGNAL

SQL Procedure Language is compatible with ANSI SQL/PSM specification

The SQL Procedure Language is converted into C by the Stored Procedure Builder

The C code goes through program preparation process

Provides ease of development with procedural SQL plus . . .

Speed of execution with compiled and prepared C


Stored Procedure Enhancements.

COMMIT and ROLLBACK:Now enabled for stored procedures

Possible for a stored procedure to issueUse with cautionWill COMMIT or ROLLBACK entire UOW

including changes made from by calling application


SQL Assist

SQL Assist provides:A tool to help you build SQL statements

SELECT INSERTUPDATEDELETE

Available in the following “products”:Control CenterStored Procedure BuilderData Warehouse Center


Scrollable Cursors . . .

Can code cursors to scroll forward and backward through the data

FETCH next rowFETCH prior rowMove cursor forward N rowsMove cursor backward N rows

Makes navigating through retrieved data easier

Work is moved from the application code into SQLUse a fixed, declared temporary table to store the result

set.


Scrollable Cursors.

SENSITIVE show changes done by the user or other users

INSENSITIVE not updateable; will not show changes made

DECLARE csr1 SENSITIVE STATIC SCROLL CURSORFOR SELECT FIRSTNAME, LASTNME FROM DSN8710.EMP ORDER BY LASTNME;OPEN csr1;FETCH LAST csr1 INTO :FN, :LN;

Scrollable Cursor FETCH Keywords

NEXTPRIORLASTCURRENTBEFOREAFTERABSOLUTE nRELATIVE n


Row Expressions

Can specify more than one set of comparisons in a single predicate using a subquery

Multiple columns compared in a single predicatePossibly against multiple rows on the right side of the

predicate

Example

SELECT *FROM SAMPLE_TABLEWHERE (COL1, COL2) IN (SELECT COLX, COLY FROM OTHER_TABLE);


External SAVEPOINTs

SAVEPOINTs basically enable sub-UOW stability points (or milestones)

Name a SAVEPOINT, for example, SPOINT1Subsequent processingROLLBACK TO SAVEPOINT SPOINT1

Can have multiple SAVEPOINTs within a UOW

Can ROLLBACK to any SAVEPOINT (OS/390)


Other Application Enhancements

JDBC and ODBC ImprovementsJDBC 2.0 supportODBC 3.0 supportCan run ODBC/CLI programs as a static application

SQL ImprovementsSelf-referencing Subselect on UPDATE or DELETEFETCH limited number of rows (e.g. TOP ‘N’ ROWS)Optimization and parallelism improvementsBetter sort avoidance techniques

IndexingAbility to select index access for small tables. DSNZPARM

value determines the threshold for a small table


Other Application Enhancements

Precompiler Services - an API called by a host language compiler or preprocessor

Precompile and compile in one stepEasier and more flexible Portability between the DB2 Family improved Initially, only available for COBOL


DB2 Version 7

Data Management Enhancements


Identity Columns

Automatically generate unique, sequential values for a table

Only one identity column per tableGood for generating unique key valuesData type must be SMALLINT, INTEGER, BIGINT, or

DECIMAL(x,0) [zero scale]Can also use a UDT based on one of these data types

ExampleCREATE TABLE EXAMPLE (ID_COL INTEGER NOT NULL GENERATED ALWAYS AS IDENTITY START WITH 100 INCREMENT BY 10 ...)


Declared Temporary Tables

Defines a temporary table for the current session, not just a UOW like Global Temporary Tables

Embedded in application program Can be dynamically preparedDoes not appear in the DB2 CatalogCan not be shared across programs, users, etc.Table materialized in new temporary tablespaceNo authority to DECLARE, but authority required to use the new

temporary tablespaceCHECK constraints and indexes are supported on temporary

tables (OS/390)


Declared Temporary Tables (continued)

Why use declared temporary tables:

Retrieve data once and use repetitively throughout a program

Retrieve data from non-relational data sources (flat file, IMS, IDMS, etc.) and use SQL to join it to DB2 data

Staging area for data before it is moved into a permanent DB2 table


What is Unicode?

Fundamentally, computers just deal with numbers. They store letters and other characters by assigning a number for each one. Before Unicode was invented, there were hundreds of different encoding systems for assigning these numbers.

Unicode provides a unique number for every character: no matter what the platform, no matter what the program, no matter what the language.

More information available at: http://www.unicode.org


Unicode Support

Support for Unicode enabled in DB2 V7

Provides multinational support

Represents characters of virtually all languages

One codeset per system

Variable length encoding scheme

supports UCS-2 and UTF-8


Utility Improvements

IBM UNLOAD utility (a third unload option from IBM)

- better speed than DSNTIAUL

- not free, extra charge from IBM

Parallel LOAD with multiple inputs- load a partitioned TS in parallel with multiple input data sets

- run in a single step

Online LOAD RESUME capability


Utility Improvement (continued)

COPY with CHECKPAGE

- enhanced error-checking on data pages

- ensures error-free backup COPY

Usual promises of speed improvements- unusual promise of additional cost

Utility wildcarding- templates & lists define groups of objects for utility processing

LISTDEF GL INCLUDE TABLESPACE GL.* INCLUDE INDEXSPACE GL.X* EXCLUDE TABLESPACE GL.*Q1 EXCLUDE INDEXSPACE GL.*XQ1

COPY LIST GL ...


Other DBA Enhancements

UNION and UNION ALL in Views - finally!

DBADM can create views for others - lessens the need for SYSADM

Deferred Data Set Creation (ERP)

- useful when many tables exist that do not have data in them

- particularly useful for ERP (such as, SAP R/3 and Peoplesoft)

DDF Suspend and Resume

- used to temporarily suspend activity from requesters

- does not terminate connections

- enables DDL at the server to complete w/o disrupting the app


Other Data Mgmt EnhancementsOnline DSNZPARM changes (subset, someday all)

- can change EDM Pool specification

History of object statistics in DB2 Catalog

- MODIFY STATISTICS

Enhanced Control Center

- can generate DDL from the Catalog using Control Center

Restart improvement

- Restart Light - Data Sharing - - smaller footprint restart performs just recovery portion of DB2 restart

- Restart and Thread cancellation - - don’t have to wait for rollbacks of long running jobs to complete


DBA Tools

IBM is officially in the DBA tools businessIntroducing numerous DBA tools for multiple areas such as change mgmt, backup/recovery, performance mgmt, application building...

But do not be fooled:the tools are not freethe tools are not all new

in some cases, IBM is charging for what used to be free

many of the tools are not developed by IBM


DB2 Version 7

Business Intelligence Enhancements


Data Warehouse Manager

The DB2 Data Warehouse Manager to enable easier data warehouse creation and management

Integrated with DB2 Control CenterControl and govern queriesHelp for data cleansing, generating key columns,

generating period tables, inverting and pivoting tablesStatistical transformers for subtotals, rollups, cubes,

moving averages, regression, etc.Replication to allow heterogeneous data movement


DB2 Version 7

“DB2 Family”Compatibility Enhancements

OS/390 LUNO

Linux, Unix, NT, OS/2 AS/400 VM and VSE Satellite Edition DB2 Everyplace


DB2 Version 7

OtherPertinentDetails


DB2 V7 Packaging

The utilities will be packaged separately under DB2 V7

Similar to the way the other “tools” shipped with DB2 are packaged (e.g., DB2-PM, Buffer Pool Tool, etc.)

Utilities will have a price tag under V7No more free utilities from IBM IBM has indicated they will still provide utilities free of

charge for Catalog operations/processing


Other V7 Stuff to Know...

GA for DB2 for OS/390 V7 most likely first quarter of 2001

Can migrate to V7 directly from V5 without first moving to V6Will require a specific maintenance level

(as yet not determined)

Of course, you can also migrate to V7 from V6


Contact Information

Craig S. MullinsDB2 Technology Planning

[email protected]

[email protected]

http://www.craigsmullins.com

BMC Softwarehttp://www.bmc.com

Delivering Application Service Assurance for S/390

http://www.craigsmullins.com/cm-book.htm

DB2 UDB for z/OS Version 7 - An Overview

Technology

xml tags

db2 version

xml extender

xml components

stored procedure enhancements

db2 v6

sql procedure enhancements

db2 v5