Reusing Oracle PL/SQL Code under IBM DB2 LUW - Act local Oracle PLSQL Code under IB… · Reusing...

©2011 Quest Software, Inc. All rights reserved.

Udo Brede

Senior Solution Architect Databases

21st June 2012

Reusing Oracle PL/SQL Code under

IBM DB2 LUW

1


Agenda

Oracle and DB2

SQL and PL/SQL

PL/SQL under Oracle

• Package

• Procedure

• Debug

Oracle Compatibility Features in DB2 LUW

PL/SQL now under DB2 LUW

• Package

• Procedure

Conclusion

2


Oracle

First release 1977/1979

Relational database

3


DB2 = Database 2 (IBM)

First release 1983

Relational database

Different “flavors”:

• DB2 z/OS (MVS, OS/390)

• DB2 VSE/VM

• DB2 on z/Linux

• DB2/2

• DB2/400 (AS400, I-Series)

• DB2 LUW (Linux, Unix, Windows)

4


Overview of the database components Oracle

Instance

File

Database

Tablespace

Schema

Table

Index

View

Trigger

Rollback Segment

Stored Procedures

Packages

SQL Plus

SQL Developer

DB2 LUW

Instance

Container

Database

Tablespace

Schema

Table

Index

View

Trigger

NA

Stored Procedures

Modules

DB2 CLP

Data Studio

5


Data Dictionary Catalog

Base tables

• SYS.xxxxx$

System views

• SYS.GV_$ or GV$

• SYS.V_$ or V$

• ALL_

• DBA_

• USER_

Base Tables

• SYSIBM.xxxx

System Views

• SYSCAT

• Read-only views defined for catalog base tables

• SYSSTAT

• Updateable set of views

• Primarily used for access path manipulation

• Administrative Views

Oracle DB2

6


Common Terms - Different Meanings

Oracle

Stored Procedure

• PL/SQL

Package

• grouping of PL/SQL blocks

• Nothing to do with optimization

Segment

• Set of Oracle Extents

DB2

Stored Procedure

• External - C,Java,Cobol

• Internal, SQL/PL

Package

• Pre-compiled Static SQL

Segment

• Block of pages in TS

7


Different Terms - Similar Meaning

Oracle

Package

Data Block

Dictionary

Alert Log

Redo Log

Archive log

Segments

Statement Cache

System Global Area (SGA)

DB2

Module (9.7)

Data Page

Catalog

Diag log

Log Files

Archival Logging

Space Consuming Objects

Package Cache

Instance shared memory/DB shared memory

8


Product Options

Express Edition • 1 CPU/1GB RAM

• 4 GB max DB size

• Nur für Windows/Linux

Standard Edition One • 2 Sockets

• Unlimited scalability

Standard Edition • 4 Sockets

• Unlimited scalability

• RAC

Enterprise Edition • Unlimited scalability

• Table Partitioning

• RAC

Personal Edition

Express-C • 2 CPU/2GB RAM

• Windows/Linux/Solaris/Mac

Express Edition • 4 CPU/ 4GB RAM max

Workgroup Edition • 16 CPUs/ 64 GB RAM

• Purescale

Enterprise Server Edition/Advance ESE • Unlimited scalability

• Purescale

InfoSphere Warehouse Editions • Data Partitioning (DPF)

Oracle DB2

9


SQL and PL/SQL - 1 The procedural SQL extension was developed by the American National Standards Institute (ANSI) as an extension to SQL. It was first adopted in 1996, and it provides procedural programmability in addition to the querying commands of SQL as SQL/PSM (Structured Query Language/Persistent Stored Modules).

PL/SQL (Procedural Language/SQL) is a proprietary programming language from Oracle that is a procedural extension of the relational programming language SQL (Structured Query Language) and a lot of Oracle development tools are included. PL/SQL is designed for working with databases. PL/SQL program units (essentially code contain-ers) can be compiled into the Oracle database. Therefore, programmers can embed PL/SQL units of functionality directly into the database. They also can write scripts containing PL/SQL program units that can be read into the database using the Oracle SQL*Plus tool.

While programmers can readily embed Data Manipulation Language (DML) statements directly into their PL/SQL code using straightforward SQL statements, Data Definition Language (DDL) requires more complex "Dynamic SQL" statements to be written in PL/SQL code. DML statements underpin the majority of PL/SQL code in typical software applications.

In the case of PL/SQL dynamic SQL, early versions of the Oracle database required the use of a complicated Oracle DBMS_SQL package library. However, more recent versions have introduced simpler "Native Dynamic SQL," along with associated EXECUTE IMMEDIATE syntax.

10


SQL and PL/SQL - 2 This procedural extension of the SQL language is now implemented by a lot of different database vendors, like Microsoft SQL Server Transact SQL (TSQL) and IBM DB2 SQL Procedural Language (SQL PL).

11


PL/SQL under Oracle: Package

12


PL/SQL under Oracle: Procedure

13


PL/SQL under Oracle: Debug Session

14


ORACLE Compatibility Features under DB2 LUW

15


Enabling Oracle Compatibility Features DB2 Compatibility Vector

• New registry value

• Enables Oracle compatibility

• Controls which compatibility features to turn on

• HEX values allowed, recommendation for Oracle is “ORA”

• With DB2 Command: db2set DB2_COMPATIBILITY_VECTOR=ORA

• Activates all features.

16


Creating a new database using the

new registry variable

• db2set command

• db2stop/db2start

• Create database

17


How to check, that my database has the

Oracle Compatibility Features switch on ? • db2 get database cfg Command

• 3rd party vendor tools

18


Compatibility Features

Oracle Data Dictionary Views

under schema “SYSIBMADM”

• ALL_*

19





• DBA_*

20





• USER_*

21


Modules - 1

New DB2 Object • Groups object definitions together for an application

• Functions

• Procedures

• TYPE

• VARIABLE

22


Modules - 2

Same as Oracle PL/SQL Packages

23


New DB2 Data Types Oracle

BFILE

BLOB

CHAR(n)

CLOB

DATE

LONG

LONG RAW

NCHAR(n)

NCLOB

NUMBER(p,s)

NVARCHAR2(n)

RAW(n)

ROWID

VARCHAR2(n)

DB2

BOOLEAN

INDEX BY

NUMBER

Oracle DATE

Ref Cursor type

ROW TYPE

TIMESTAMP(n)

VARCHAR2

VARRAY

NCHAR, NVARCHAR2, NCLOB

24



CLPPlus

• Like the Command Line Processor “SQL*Plus” from Oracle

• Provides a familiar environment for Oracle DBAs to interact with DB2

• Compatible interface: run Oracle SQL*PLUS scripts with no modification

25


New Concurrency Control under DB2 LUW

Isolation level „Cursor Stability“ is enhanced with “Currently Committed“

• Under DB2 LUW version 9.7 is “Currently Committed” the default setting for new databases (up to 9.5 it was “Cursor Stability”)

• Currently Committed is “disabled” during upgrade from existing database

• Perhaps older existing application syntax has to change!

• No additional memory, no mangement overhead, no performance loss

26


Application Enablement

Native PL/SQL support • No SQL translation required

• PL/SQL compiler

• PL/SQL debugger

• PL/SQL Object support

• After each row triggers

• Anonymous Blocks

• Before each row triggers

• PL/SQL packages

• Procedures

27


PL/SQL under DB2 LUW: PL/SQL Package

28


PL/SQL under DB2 LUW: Procedure

29


PL/SQL under DB2 LUW: Procedure Dependencies

30


PL/SQL Procedure under both DBMS

31


Conclusion IBM’s release of DB2 LUW 9.7 gives you Oracle compatibility features and supports PL/SQL, making migration from Oracle to DB2 possible. With IBM Purescale technology for DB2 LUW, IBM also has an answer to Oracle RAC. IBM helps you by providing additional analysis of your Oracle application to find the best migration path for your environment. Also IBM continues to deliver more features in this area with fixpacks of DB2 LUW 9.7 and also with the new 10 release.

But there are more capabilities beyond migration: You can develop Oracle PL/SQL on DB2 LUW. I recommend that you take a look at the different database editions each vendor offers and compare pricing and development costs. Don’t forget to take into account additional Oracle license costs for things like the OEM diagnostics and tuning management packs.

DBAs and application developers should evaluate the possibilities, but there are still many differences between Oracle and DB2 LUW. Tools that work and look similar on both databases can help minimize your learning curve and save your organization money.

32


Information & Resources

• IBM: Run Oracle applications on DB2 10 for Linux, UNIX, and Windows by Serge Rielau: http://www.ibm.com/developerworks/data/library/techarticle/dm-0907oracleappsondb2/

• Quest Software: Expert blogs (Steve Feuerstein, John Pocknell) and free videos: http://www.ToadWorld.com

http://www.ibm.com/developerworks/data/library/techarticle/dm-0907oracleappsondb2/



http://www.toadworld.com/


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