Reusing Oracle PL/SQL Code under IBM DB2 LUW

Transcription

1 Reusing Oracle PL/SQL Code under IBM DB2 LUW Udo Brede Senior Solution Architect Databases 21 st June 2012

2 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 1

3 Oracle First release 1977/1979 Relational database 2

4 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) 3

5 Overview of the database components Oracle Instance Instance File Container Database Database Tablespace Tablespace Schema Schema Table Table Index Index View View Trigger Trigger Rollback Segment NA Stored Procedures Stored Procedures Packages Modules SQL Plus DB2 CLP SQL Developer Data Studio DB2 LUW 4

6 Data Dictionary Oracle Base tables SYS.xxxxx$ System views SYS.GV_$ or GV$ SYS.V_$ or V$ ALL_ DBA_ USER_ Catalog DB2 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 5

7 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 6

8 Different Terms - Similar Meaning Package Data Block Dictionary Alert Log Redo Log Archive log Segments Oracle Statement Cache System Global Area (SGA) Module (9.7) Data Page Catalog Diag log Log Files DB2 Archival Logging Space Consuming Objects Package Cache Instance shared memory/db shared memory 7

9 Product Options Oracle 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 DB2 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) 8

10 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 containers) 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. 9

11 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). 10

12 PL/SQL under Oracle: Package 11

13 PL/SQL under Oracle: Procedure 12

14 PL/SQL under Oracle: Debug Session 13

15 ORACLE Compatibility Features under DB2 LUW 14

16 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. 15

17 Creating a new database using the new registry variable db2set command db2stop/db2start Create database 16

18 How to check, that my database has the Oracle Compatibility Features switch on? db2 get database cfg Command 3rd party vendor tools 17

19 Compatibility Features Oracle Data Dictionary Views under schema SYSIBMADM ALL_* 18

20 Compatibility Features Oracle Data Dictionary Views under schema SYSIBMADM DBA_* 19

21 Compatibility Features Oracle Data Dictionary Views under schema SYSIBMADM USER_* 20

22 Modules - 1 New DB2 Object Groups object definitions together for an application Functions Procedures TYPE VARIABLE 21

23 Modules - 2 Same as Oracle PL/SQL Packages 22

24 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 23

25 Compatibility Features 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 24

26 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 25

27 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 26

28 PL/SQL under DB2 LUW: PL/SQL Package 27

29 PL/SQL under DB2 LUW: Procedure 28

30 PL/SQL under DB2 LUW: Procedure Dependencies 29

31 PL/SQL Procedure under both DBMS 30

32 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. 31

33 Information & Resources IBM: Run Oracle applications on DB2 10 for Linux, UNIX, and Windows by Serge Rielau: oracleappsondb2/ Quest Software: Expert blogs (Steve Feuerstein, John Pocknell) and free videos: 32

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