Avoiding.the.pitfallsof.oracle.migration.2013

Road to Freedom: 
Avoiding the Pitfalls  
of 
Oracle Migration Projects "
Presented by "
Craig Silveira"
Director, WW Sales Engineering"
EnterpriseDB Corporation"
info@enterprisedb.com "

EnterpriseDB, Postgres Plus and Dynatune are trademarks of
EnterpriseDB Corporation. Other names may be trademarks of their 1
respective owners. © 2010. All rights reserved.

Common Pitfalls of Oracle Migration"

1.  Inadequate or inaccurate migration assessment
2.  Incomplete migration plan
3.  Lack of migration expertise to handle unforeseen problems
4.  Lack of available time & trained resources

© 2013 EnterpriseDB. Privileged and Confidential. All rights reserved. 2

Who is EnterpriseDB?"


u  We enable the beneﬁts of Postgres along with the commercial
dependability, resources and support needed for enterprise-class
applications"
u  Because we are a database product development company, we also
offer:"
u  Full product roadmap strategy!
u  Indemniﬁcation !
u  Deep Postgres engineering talent & resources!

u  We are a major supporter of the PostgreSQL community"
u  We provide a wide array of Postgres products, services, training
and support to meet all your Postgres needs!

© 2013 EnterpriseDB. Privileged and Confidential.
4
"
© 2013 EnterpriseDB. All rights reserved.
All rights reserved.

5
© 2013 EnterpriseDB. All rights reserved. 5

Assessment Factors to Consider
u  Technical:
•  Compatibility
•  Feature sets
u  Human:
•  Training
•  Change management
u  Operational:
•  Testing
•  Monitoring
•  Management
•  Back-up
•  Replication
•  Security

7


Oracle Migration Assessment"
1 Analyze Oracle Schema Layout:

Static Analysis of Oracle Schema
and database layout

2 Review features used in Oracle client application:

Static Analysis of Source Code

Developer Interviews


3 Evaluate results along 5 axis using proven algorithms:

4 Migration report developed:
u  Score
of 1 – 10 assigned based on
analysis of steps 1 and 2
–  1 difﬁcult – 10 minimal effort!
u  Work arounds for identified missing
features
u  Time estimates given in man weeks


What Does 
Oracle Compatibility 
Mean?"


Oracle Compatibility Reduces Risk"

u  Run applications written for Oracle virtually unchanged
u  No need to re-train Oracle DBAs and developers
u  Support for PL/SQL language and OCI interoperability
u  Replication for easy sharing of data


What Is Postgres Plus Advanced Server?"

u  Built on the world’s most advanced
database—PostgreSQL
u  9th generation Oracle compatibility
u  World-class security add-ons
u  Performance that rivals any other
proprietary RDBMS
u  Enterprise-class developer and
DBA tools
PostgreSQL u  Installation, performance tuning,
and maintenance services
u  Software indemnification

CONFIDENTIAL

Compatibility Means:"
u  SQL extension support
•  Decode, NVL, Substr, NVL2"
•  Date/time functions: add_months, extract, next_day "
u  PL/SQL support
•  REF Cursors, Implicit and explicit cursors"
•  Looping, variable declarations, conditional statements"
•  Collections: Associative Arrays, Varrays, Nested tables"
•  Bulk binding"
•  Named parameters"
•  User Deﬁned Exceptions"
•  Explicit Transaction Control"
–  within a stored procedure!
–  (not supported by PostgreSQL!
u  Tools
•  EDB*Plus – SQL*Plus look-a-like"
•  EDB*Loader – SQL*Loader equivalent"
•  EDB*Wrap – similar to the PL/SQL wrapper"


Compatibility means: (cont.)"
u  Features
•  Packages"
•  Stored procedures"
•  Functions"
•  Triggers"
•  Hints"
•  Database Links"
•  Hierarchical Queries"
•  Synonyms – Public and Private"
•  Sequences"
•  Rownum"
•  Object types "
–  Create type … as object!
–  Create type … as table!
–  Create type …as varray!
–  Constructor and collection methods!
•  Users/Roles"
•  Dynamic SQL"
"

Compatibility (cont.)"
u  Data Types
•  Integer, number, char, double precision, ﬂoat, varchar2, blob, clob, xmltype,
rowid"
u  Built-in Packages
•  DBMS_:"
–  SQL, LOB, JOB, PIPE, ALERT, OUTPUT, UTILITY, PROFILER!
•  UTL_:"
–  FILE, MAIL, SMTP, ENCODE, TCP!
u  Oracle-like Data Dictionary
•  ALL_, DBA_, USER_ views"
•  Most commonly accessed views"
u  Diagnostics - DRITA
•  System and session waits"
–  Not exposed in PostgreSQL !
–  Part of Advanced Server!
•  Statspack-like reporting"

Database Migration Toolkit ""
u  Online Migration Toolkit enables point and click migration from
Oracle
u  Automatically Migrates:

u  Data u  Sequences
u  Schemas u  Packages
u  Stored Procedures u  Views
u  Triggers u  Database Links
u  Functions u  Synonyms


Ease of Migration"


What Does 
This  
Mean to You?"


Oracle Compatibility & Migration Strategies"
Strategy Benefits
§ Significant cost savings for non mission critical
Develop/Deploy systems
New LOB Applications § Leverages all existing Oracle skills
§ Very low risk
§ Significant cost savings
Deploy Postgres Plus
§ Leverages Postgres Plus Replication Server
as Oracle § Leverages all existing Oracle skills
Replication Server
§ Improves transaction and query performance

Migrate non Mission § Significant cost savings
Critical Oracle Apps to § Leverages all existing Oracle skills
Postgres Plus § Very low risk

Migrate Mission Critical § Biggest cost savings
Oracle Apps to § Leverages all existing Oracle skills
Postgres Plus § Greatest deployment flexibility

© 2009 EnterpriseDB Corporation

Applications built on PostgreSQL"


Migration Example"


Migration Methodology"


Multi-phase Migration Process"
u  Phase I – Planning
•  Determine what application to migrate"
–  Home grown applications!
–  Java, C!
–  Packaged applications that support multiple databases!
–  Support JDBC, ODBC"
•  Once candidate applications are chosen, sign up for OMA"
•  Oracle Migration Assessment (OMA) Identiﬁes:"
–  Possible migration issues!
–  Gives time estimate to migrate system"
•  Establish migration team:"
–  Need source system knowledgeable resource!
–  Need target system knowledgeable resource"
•  Establish project plan with milestones"


u  Phase II – Prepare Environment
•  Obtain and install necessary software"
•  Establish connectivity between systems"
–  Copy the Oracle JDBC jar file to jre/lib/ext directory in Postgres Plus Advanced
Server Installation!
u  Phase III – Migrate Schema
•  Use Migration Toolkit in schema only mode"
•  Resolve issues here before going to next phase"
u  Phase IV – Migrate Data
•  Use Parallel streams in Migration Studio"
•  OR Use command line MTK"
–  Use –copyViaDBLinkOra!
–  Uses OCI to connect to Oracle!
•  Use dblink_ora_copy function directly to bypass logging"
•  Export Oracle data to flat files, load using EDB*Loader"


u  Phase V – Port Application
•  Change connection information"
•  Recompile /Link application (OCI or Pro*C)"
u  Phase VI – Test
•  Verify application functionality"
•  Address issues"
•  Test performance "
•  Tune"
u  Phase VII Integration
•  Establish co-existence strategy"
•  Setup database links to other databases"
•  Setup replication between Oracle or SQL Server and Postgres Plus
Advanced Server "
u  Phase VIII – Rollout
•  System becomes production "


How to Migrate: 
A Step by Step Guide"


Phase I Oracle Migration Assessment"
u  *** Checking for Migration Issues ***
u  Object Type Type Count
u  ----------------------------------------------------------------------------------
u  TRIGGER Count 0
u  SOURCE Package 0
u  SOURCE Syntax - Exception 0
u  SOURCE Function 789
u  SOURCE Syntax - Object 0
u  SOURCE Syntax - Other 792
u  SOURCE Syntax - Hints 282
u  SOURCE Syntax - Exp Trans Ctl 730
u  SOURCE Total Count 2623
u  COLLECTION Count 1
u  VARRAY Count 0
u  DIMENSION Count 0
u  JOB Count 0
u  MATERIALIZED VIEW Count 0
u  RESOURCE MGR Count 0
u  POLICY Count 9
u  PROFILE Count 6
u  SUMMARY Possible Migration Issues 2775


Phase II Setup Environment"
u  Establish connectivity
•  Copy Oracle JDBC jar ﬁle to Postgres Plus Advanced Server install"

cp /usr/lib/oracle/xe/app/oracle/product/10.2.0/server/jdbc/lib/ojdbc14.jar /opt/
PostgresPlus/9.0AS/jre/lib/ext"
"
•  Edit the toolkit.properties ﬁle to contain Oracle and Postgres Plus Advanced
Server connection information:"

SRC_DB_URL=jdbc:oracle:thin:@localhost:1521:xe"
SRC_DB_USER=system"
SRC_DB_PASSWORD=mgr"
"
TARGET_DB_URL=jdbc:edb://localhost:5999/demo"
TARGET_DB_USER=demo"
TARGET_DB_PASSWORD=mgr"
"


Phase III Migrate Schema"
u  Use MTK in schema only mode:
[enterprisedb@localhost bin]$ ./runMTK.sh -schemaOnly hr
Source database connectivity info...
conn =jdbc:oracle:thin:@localhost:1521:xe
user =system
password=******
Target database connectivity info...
conn =jdbc:edb://localhost:5999/demo
user =demo
password=******
Connecting with source Oracle database server...
Connecting with target EnterpriseDB database server...
Importing redwood schema hr...
Creating Schema...hr
Creating Object Type: NUMLIST
Creating Sequence: EMPLOYEES_SEQ
Creating Tables...
Creating Table: EMPLOYEES


Phase III Migrate Schema con’t"
******************** Migration Summary ********************
Object Types: 9 out of 9
Sequences: 3 out of 3
Tables: 49 out of 53
Constraints: 39 out of 40
Procedures: 7 out of 7
Functions: 3 out of 3
Packages: 3 out of 3

Total objects: 139
Successful count: 134
Failure count: 5

List of failed objects
======================
Tables
--------------------
1. HR.BFTEST
2. HR.TESTBD
3. HR.TESTBF
4. HR.TESTCNTXT


Phase III Migrate Schema con’t"
u  Migration logs stored in user’s home directory :
/home/enterprisedb/.enterprisedb/migration-toolkit/logs"
u  Resolve issues:
Error Creating Table TESTCNTXT:ERROR: function sys_context(unknown,
unknown) does not exist
Hint: No function matches the given name and argument types. You might need to
add explicit type casts.

CAUSE: this table used SYS_CONTEXT(‘USERENV’,’CURRENT_USER’) as a
DEFAULT value
RESOLUTION: use CURRENT_USER function instead


Phase IV Migrate Data"
u  Use MTK in data only mode:
[enterprisedb@localhost bin]$ ./runMTK.sh -dataOnly hr
Source database connectivity info...
conn =jdbc:oracle:thin:@localhost:1521:xe
user =system
password=******
Target database connectivity info...
conn =jdbc:edb://localhost:5999/demo
user =demo
password=******
Connecting with source Oracle database server...
Connecting with target EnterpriseDB database server...
Importing redwood schema hr...
Loading Table Data in 8 MB batches...
Loading Table: AGES ...
[AGES] Migrated 1 rows.
[AGES] Table Data Load Summary: Total Time(s): 0.467 Total Rows: 1
Loading Table: DEPARTMENTS ...


Phase V Port the Application"

§  Change Application Connection method
§  Java application =
§  Old connection syntax:
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection con =
DriverManager.getConnection("jdbc:oracle:thin:@localhost:
1521:xe”,”scott”,”tiger”);

§ New connection syntax:
Class.forName("com.edb.Driver");
Connection con = DriverManager.getConnection("jdbc:edb://localhost:
5444/edb",
"enterprisedb","enterprisedb");


Handling Issues"


Handling Issues"
u  Not all migrations are error free
•  Migration log will contain all errors"
u  Some common issues:
•  Column delimiter chosen is in column data"
–  Causes ‘Extra data found’ error!
–  Resolve by using different delimiter!
u  Oracle built-in package does not exist
•  DBMS_AQ – we use solutions like ActiveMQ, MQSeries or Tibco"
–  Or own code. Enqueue and dequeue procedures are fairly easy to code!
–  xDB Replication Server can also be used since based on pub/sub architecture!
–  DBMS_RANDOM – use random function instead!
–  DBMS_LOCK.sleep – use pg_sleep function instead!
u  Oracle feature not supported
•  MERGE command not supported"
–  Can be rewritten to use INSERT and UPDATE with checks!
•  Index Organized Tables"
–  Cluster a table using CLUSTER! command for same read performance gain!


Handling Issues (continued)"
u  Database Links
•  Migrated over by tool but password is invalid"
–  This is because Oracle hides the password!
–  Resolve by dropping and recreating!
–  Or by specifying a password to use when running the MTK!

–  runMTK -allDBLinks LINK_NAME1=abc,LINK_NAME2=xyz HR

u  Data Movement – performance
•  Migration toolkit connects via jdbc"
•  Large datasets are slow to move"
•  Use database link functionality instead"
–  Dblink_ora_copy – EnterpriseDB method to copy data from Oracle over OCI!
–  Much faster!
•  OR extract data from Oracle to csv ﬁles, the load using edbldr"

"
"


Tuning Recommendations"
u  Use DynaTune
•  Dynamically adjusts database conﬁguration based on available resources"
•  Set via edb_dynatune parameter"
–  Values 0 – 100 corresponding to % of machines to use!

u  Remember to analyze database
•  Use Analyze command"

u  Oracle Hints supported
•  No need to remove from embedded SQL"


How EnterpriseDB Can Help"


EnterpriseDB Resources & Assistance"

RESOURCES
EFFORT/ ROI

TIME

INVESTIGATION VALIDATION MIGRATION/ PRODUCTION
DEVELOPMENT

•  Best-Practices? •  Support?
•  PGSQL capabilities?
•  Performance? •  Risk mitigation? •  Staff augmentation?
•  Feature mapping?
Customer •  Compatibility? •  Migration •  Training?
•  TCO/ROI?
Challenges •  Security? assistance? •  Replication?
•  EDB capabilities?
•  Cost? •  Tech resources? •  Monitoring?
•  Product Road-map?
•  DBA Skills? •  Indemnification?

•  Opportunity Analysis •  Migration •  Product Support
•  Enterprise
Workshop Assessment Test •  Remote DBA
Enablement
EnterpriseDB •  Architectural health check •  Performance •  Training
•  Oracle
Resources •  White papers benchmarking •  Enterprise Manager
compatibility
•  Analyst reports •  References •  xDB Single/Multi-
•  Migration planning
•  Webinars •  Case Studies master replication


Enterprise Enablement Services"
Goals
•  Reduce time to value
•  Reduce risk
•  Contain cost
•  Enable self-sufficiency
Knowledge
•  Ensure success Transfer

On-demand
Training Access to
Experts

Configuration
Best Practices

Architecture Remote DBA
Best Practices Services

Developer
Support &
Break Fix


u  Paid for service from EnterpriseDB
u  What is it?
•  Pre-analysis interview"
•  Analysis of Oracle schemas to be migrated"
•  Finds possible migration issues"
–  Unsupported Features!
–  Unsupported Syntax!
–  Implementation Differences!
•  Findings documented with possible workarounds in ﬁnal report"
•  Post analysis discussions to review ﬁndings"
u  Migration feasibility score assigned (1 – 10)

http:www.enterprisedb.com/solutions/oramig.do


Oracle Migration Factory Core Services"
u  Customer provides data-less Oracle export of database
u  Migrate the database(s) to Postgres Plus Advanced Server
•  Resolve any issues"
•  Implement workarounds for missing or different functionality"
•  Perform sanity checking of unit functionality"
–  Requires input/output from customer on same units in Oracle!

u  Document the changes/workarounds
u  Educate Customer on changes/workarounds
•  Advise on application level changes needed"
u  Return migrated databases to Customer
•  Via pg_dump"

u  Customer can customize with add on options


Oracle Migration Factory Add-ons"
u  Setup and Migrate test system
•  Installation of Postgres Plus Advanced Server on Customer server"
•  Import of migrated database to Postgres Plus Advanced Server ""
•  Migration of test data from a test Oracle system"
u  Application Functional Testing
•  Provide assistance in connecting application to database"
•  Provide assistance in functional testing of application"
•  Resolve functional testing issues"
u  Performance Tuning of Migrated System
u  Production Migration Setup
•  Install Postgres Plus Advanced Server on target production server"
•  Import migrated database from testing server"
•  Setup of xDB Replication Server "
–  Snapshot process will migrate production Oracle data !
–  Deltas are captured by xDB triggers!
–  Once snapshot is done, synchronization is performed!


Summary"
u  Migrations are no longer impossible
u  Compatibility provides
•  Lower cost of migrations"
•  Shorter migration timelines"
•  Lower risk (you can always go back)"
u  EnterpriseDB provides
•  Oracle compatibility"
•  Automated tools to migrate from Oracle"
–  And others: MySQL, Sybase, SQL Server (data & schema)!
•  Migration Expertise for:"
–  Planning!
–  Performing migration!
–  Testing !
–  Rollout!
!

!
!

EnterpriseDB Resources"
"
u  EnterpriseDB on-demand training
•  http://www.enterprisedb.com/store/products/dba-training "

u  Resources & Community
•  Whitepapers, datasheets, podcasts, videos, community!
•  http://www.enterprisedb.com/resources-community "

u  Questions about Postgres products, support and services
•  sales@enterprisedb.com or info@enterprisedb.com "

u  Follow us on Twitter, Facebook & LinkedIn for daily updates
•  Twitter: @EnterpriseDB "
•  Facebook: https://www.facebook.com/EnterpriseDB"
•  LinkedIn: EnterpriseDB: The Enterprise Postgres Company "
"

@2013 EnterpriseDB. All Rights Reserved.

Avoiding.the.pitfallsof.oracle.migration.2013

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