Reality Check:Converting Oracle

Applications to DB2Session Number 2250

Serge Rielau, IBMArchitect for

Oracle Application Compatibiltysrielau@ca.ibm.com

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Please Note:

IBM’s statements regarding its plans, directions, and intent are subject to change or withdrawal without notice at IBM’s sole discretion.

Information regarding potential future products is intended to outline our general product direction and it should not be relied on in making a purchasing decision.

The information mentioned regarding potential future products is not a commitment, promise, or legal obligation to deliver any material, code or functionality. Information about potential future products may not be incorporated into any contract. The development, release, and timing of any future features or functionality described for our products remains at our sole discretion.

Performance is based on measurements and projections using standard IBM benchmarks in a controlled environment. The actual throughput or performance that any user will experience will vary depending upon many factors, including considerations such as the amount of multiprogramming in the user's job stream, the I/O configuration, the storage configuration, and the workload processed. Therefore, no assurance can be given that an individual user will achieve results similar to those stated here.

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Agenda● Motivation

● Compatibility Primer

● Traction

● Experience

● Lessons

● Outlook

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Why migrate to DB2?

Provide value for money

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Why migrate to DB2?

Provide world class support

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Why migrate to DB2?

Treat partners well

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Application compatibility, vitalsOracle DB2

Concurrency Control Native support Oracle SQL dialect Native supportPL/SQL Native supportPL/SQL Packages Native supportBuilt-in package library Native supportOracle JDBC extensions Native supportOCI Native support (db2ci)Oracle Forms e.g. Wonderworks FusionPaaSSQL*Plus Scripts Native support (clpplus)RAC DB2 pureScale

Changes are the exception. Not the rule.

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• Syntax toleration Where no semantic conflicts exist

• Add infrastructureEliminate impedance mismatch

• Compatibility modesOvercome clashes between DB2 and other SQL dialects

• Near out of the box compatibility for your app– Client side– Server side

This is not an emulation!

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• Source level debugging and profiling

• Built-in

• Proven

Native PL/SQL support in DB2

PL/SQL executes at the same speed as SQL PL in DB2

DB2 Server

SQL PLCompiler

SQL Unified Runtime Engine

Debugger

Profiler

Data StudioEditor

Database

PL/SQLCompiler

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Steps of MigrationPOCAssessment Database

ConversionApplicationConversion Testing

AutoFix MEET Estimator

CAQ

• AutoFix Parse application code and replace unknown SQL API syntax by proper DB2 SQL API syntax. We use standard pattern based replacement of known repetitive code snippets

• MEET Analyzes SQL code for its compatibility with DB2 residing inside the database or within other programming languages

• Conversion Assessment Questionnaire (CAQ) Creation of electronic form which will prepare the collected information by clients for the estimation process

• Estimator calculates the conversion efforts based on MEET and CAQ findings

PackageVisualizer

• Package Visualizer depicts dependencies between PL/SQL objects to identify the right scope for a POC

IDMT

• IDMT Automatically deploys database structure and data from other vendor’s databases to DB2

Database conversion workbench

CoversionProject

Timeline

Optim Data Studio

AdditionalOracle

Packages

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Data Movement Tool – Drag, Drop, Patch

IBM Confidential 12

Traction• The Clients have the choice, have spoken

• … and are getting bolder– Started off increasing DB2 participation incrementally – More and more requesting RFQ for “all-in” deals– often expand out from SAP/DB2 win

• Potash, Canada ● France Telecom, France● Faith Industries, Italy ● Colgate, USA● Wu Han Metro, China ● Indian Bank/TCS, India● Ministry Environmental Protection, China ● China Mobile, China● China Minsheng Bank, China ● TOTVS, Brazil● Canadian Blood Services (#1371) ● First Data Corp, USA● J. P. Morgan Chase, USA (Keynote) ● Subex, India (#3597)

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Deeper dive into one customer

• Packaged application in the “Travel Reservation” space– Server Oracle 10gR2

– Client API: OCI

– Programming language: Delphi

– 25MB of PL/SQL

– Expectation “One Source” outcome.

– Plan to deploy as SaaS

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DB2 9.7 MEET Report

Benefits• Rapid assessment of

application• Early confirmation of

compatibility• Lists details and source code

line number for exceptions

96.8% of statements immediately transferable to IBM DB2

● Less than 5% objects with issues● 6500 lines to investigate

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MEET DB2 Peeling the Onion

• Top 3 responsible for 89% of issues!

Feature Description Description #BOOLEAN IN ROW BOOLEAN field cannot be part of a record definition. 4103PRAGMA Some PRAGMA directives are not supported. 1600XMLDOM XMLDOM functionality is not supported. 244NESTED PROGRAMS Nested procedure and function definitions are not supported. 175UTL_RAW UTL_RAW package is not supported. 153COLLECTION OBJECTS Only Associative arrays are supported when declared in

packages.78

V$ VIEWS V$* or V_$* VIEWS are not supported. 74DBLINKS DbLinks syntax is not supported. 46NOWAIT NOWAIT functionality is not supported. 46DBMS_SQL changes Some DBMS_SQL procedures have different names in DB2. 36VARCHAR2 LIMIT EXCEEDED The varchar2 size for the DB2 should be limited to 32672. 33Misc (Everything else) 155

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MEET DB2 Top 3 Analysis

• Do not allow BOOLEAN types row attributes• Need to map to CHAR(1) or SMALLINT• Direct support provided in 9.7.5 (Oct 2011)

• DB2 supports similar concept (READ/MODIFIES SQL DATA)

• This is a defensive compiler option– Can be commented out without semantic impact

• An AS-IS version of XMLDOm is available upon request.

61%

24%

3%

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Application Compatibility Development Process

• Focus

– Customer driven

– Aggressive

– Continuous

• Balance

– Performance

– Road blocks

– Simplification

– Reach

Cost Compatibility

MEET

Development Plan

Develop

Dep

loy

Ana

lyze

MEETReports

Database

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Application Compatibility over Time

• Data is based on MEET DB2 reports in the database

– Actual number of reports run is unknown

• Compatibility is improved

– but improved MEET DB2 catches more problems

– More and more complex applications

• Most recent IBM led Proof of Concepts already use DB2 9.7.5

9.7.0 9.7.1 9.7.2 9.7.3 9.7.4 9.7.5 Vnext0

102030405060708090

100

% LOC unchangedNumber of reports

300

0

60

120

180

240

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38 (of 220) Applications analyzed

● Range of industries, solutions, countries

● Various sizes1006 to 114,502 Lines of Code

● Significant sample size:2,048,941 LOC total

● 83% - 99.9% of LOCimmediately transferable to DB2

MEET DB2 FP4 statistics

0102030405060708090100

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Average effort across large enterprise clients and ISVs

What impacts migration time

• Oracle Forms• Partition

handling• AQ• Pro*C

OR features 3rd party

dependencies• Replication• Text search• OCCI

ComplexMedium

• DBMS_STATS• PHP/PERL• Java• OCI

Easy

Determining Factors● Quantities of issues listed below ● Critical path● Team skills ● Dependencies of code

% DB2 9.7 Historic ReductionEasy 50 1PW-1PM 1PM-6PM

75%Medium 35 1PM-1PY 6PM-4PYComplex 15 >1PY >4PY

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Top 10 issues found in aggregate 1. DBMS_APPLICATION Package not provided2. Nested routines Pull out to package or global3. DBLINK usage Maps to federation4. DBMS_SQL Package exists, but small adjustments needed5. NUMBER precision NUMBER(38) → NUMBER(31)6. VARCHAR2 length VARCHAR2(32767) → VARCHAR2(32672)7. SYSTIMESTAMP Typically CURRENT TIMESTAMP works well8. Unique on NULL columns Often domain is not null or map index9. EXIT/GOTO in exceptions Easy rewrite

10. XMLDOM package As-is version available upon request

• Ordered by number of occurrences within and across applications

• .. but number of occurrences is a poor measure of complexity

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DB2 Development GamblesCursor Stability with CURRENTLY COMMITTED

– Simpler and faster than Statement Isolation with MVCC

– Sufficient in vast majority of cases

PL/SQL Functions– Did not expect that PL/SQL functions are that common

– PL/SQL functions share same capabilities as PL/SQL Procedures(Updates, Rollback, OUT parameters, Default, Named Args...)

Incrementally aligned capability over multiple 9.7 fixpacks

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DB2 Development Strategy

DB2

PHP

JDBC

Mart

OLTP

Pro*C

Forms

Warehouse

.Net

RAC

9.1 → 9.7 reduced Conversion effort by 90%9.7 → Vnext aim to reduce Conversion effort by 50% again

Fattening the PipeFurther simplify

conversions

Fattening the PipeFurther simplify

conversionsWidening the FunnelAccept more applications

● More APIs● *******● Forms● pureScale● *****************

Widening the FunnelAccept more applications

● More APIs● *******● Forms● pureScale● *****************

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9,7.1 OCI Extend reach ●

SUBSTRB, increase compatibility ●

INOUT UDF Parms Increase compatibility ●

Basic warehousing support Extend reach ●

Conditional Compilation ISV ●

Improve BOOLEAN, FORALL, BULK COLELCT Increase compatibility ●

9.7.2 Obfuscation ISV ●

NCHAR, NVARCHAR, NCLOB Extend reach ●

DEFAULT UDF Parameters Increase compatibility ●

9.7.3 NUMBER Performance Performance ●

Runtime “purity level” enforcement Increase compatibility ●

RATIO_TO_REPORT,RAISE_APPLICATION_ERROR Increase compatibility ●

Small LOB compare Increase compatibility ●

9.7.4 Multi action trigger, update in before triggers Increase compatibility ●

Autonomous Tx improvements Increase compatibility ●

LIKE improvements, LISTAGG Increase compatibility ●

ROW, ARRAY of ROW JDBC support Increase compatibility ●

9.7.5 Pro*C Extend Reach ●

Nested complex types Extend Reach ●

NVL2, REPLACE, SUBSTR2 Increase compatibility ●

******* ******************************************** Increase compatibility ●

***************************** Performance ●

*******... **************** Extend Reach ●

************************************* Extend Reach ●

********************** Performance ●

●Shipped●In Plan●Considered

Ongoing Focus – Customer driven

You are

here

You are

here

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Conclusion/Outlook

• DB2 compatibility with Oracle applications has rapidly matured

• Compatibility is implemented in DB2's core for native performance

• DB2 customers benefit from simplified skills transfer

• DB2 will continue to extend compatibility with Oracle applications to further drive down enablement cost.

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Related Sessions

1692 Save Money! New Tools and Their Usage to Convert From Oracle Faster1566 Migrating Large Databases with CDC3597 Powering Subex's Revenue Operations Centre with IBM DB21371 Migrating the Canadian Blood Services Data Warehouse From Oracle to

IBM DB2

1575 Coca-Cola Bottling Ongoing IBM DB2 Journey3566 FusionPaaS: Automated Migration of Oracle Forms Applications to Open

Cloud Platform on IBM DB2 & IBM WebSphere

3562 IBM DB2 Speaks Oracle: Technology Session3755 Enabling and Migrating Applications to IBM DB22706 Take Control of Oracle Licensing Costs

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Appendix• Wiki with technical and non technical resources

www.tinyurl.com/Oracle2DB2Wiki

• DB analysis tool (free for download and usage)www.tinyurl.com/MeetDB2

• DB movement tool (free for download and usage)www.tinyurl.com/Move2DB2

• Buzzwww.tinyurl.com/ServersForTruth-1www.tinyurl.com/ServersForTruth-2www.tinyurl.com/reTHINKmigration-1www.tinyurl.com/reTHINKmigration-2

Contact: askdata@ca.ibm.com

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• On-line communities, User Groups, Technical Forums, Blogs, Social networks, and more

– Find the community that interests you…

• Information Management ibm.com/software/data/community

• Business Analytics ibm.com/software/analytics/community

• Enterprise Content Management ibm.com/software/data/content-management/usernet.html

• IBM Champions

– Recognizing individuals who have made the most outstanding contributions to Information Management, Business Analytics, and Enterprise Content Management communities

• ibm.com/champion

Communities

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Acknowledgements and Disclaimers:

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– U.S. Government Users Restricted Rights - Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp.

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