This document discusses migrating from Oracle to PostgreSQL. It begins with an agenda that includes an EDB overview, reasons to migrate, components of a successful migration, and what EDB offers to help. EDB provides tools like PostgreSQL with Oracle compatibility features, migration portals and toolkits, and management products to aid in migrating from Oracle to their PostgreSQL platform. The presentation demonstrates migration tools and discusses identifying good candidates for migration and challenges to consider.

1. CONFIDENTIAL © Copyright EnterpriseDB Corporation, 2018. All rights reserved.
Migrate from Oracle
to Postgres
Why Wait?
Marc Linster – SVP
Product Development
EnterpriseDB
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TAKE AWAYS
• 50%+ of migrations are easy – how do I identify those?
• Why is a Oracle-compatible version of Postgres and the
Postgres drivers so important?
• If its not just about the database … what else do I need?
• Step by step – how do I go about it?

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AGENDA
• EDB Overview
• Why migrate?
• Components of a successful migration project
• What does EDB bring to the table?
• Pick your battles
• Demo
• Next steps

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THE ENTERPRISE POSTGRES COMPANY
EnterpriseDB (EDB) delivers the premier open source-based, multi-model data
platform for new applications, cloud re-platforming, application modernization,
and legacy migration.

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ONLY OPEN SOURCE
RDBMS IN
GARTNER MQ
EDB Recognized
In a Row on Gartner’s
Magic Quadrant
5
Plus, The Forrester Wave™ Document Stores Q3 2016 - Strong Performer

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EDB OPEN SOURCE LEADERSHIP
Named EDB open source committers and contributors
Akshay Joshi Amit Kapila Amul Sul Andres Freund Ashesh Vashi Ashutosh Sharma
Bruce Momjian Dave Page Devrim Gunduz Dilip Kumar Jeevan Ladhe Mithun Cy
M. Usama Robert Haas Rushabh Lathia Thom Brown Thomas Munro

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EDB POSTGRES PLATFORM

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WHY MIGRATE?
• Economic reasons
• Flexibility of deployment - one Postgres everywhere
• Innovation (JSONB, PostGIS, interval data types, …)

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ECONOMIC REASONS
Source: IDC: The Economic and Business Advantages
of EnterpriseDB Postgres Database Solutions, 2016

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FLEXIBILITY: SAME POSTGRES EVERYWHERE
• Bare metal
• Virtualized deployments
• Container deployments
• Public cloud deployments
 Interchangeable software and license

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INNOVATION LEADER
• Vibrant community
• ACID Compliant
• SQL + JSONB + KVP + GIS
• Many data types
• Foreign data wrappers
• Native streaming and logical replication
• …

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COMPONENTS OF A MIGRATION
• Data and data structures
are easy
• Code (queries and stored
procedures look easy)
• Interfaces (OCI, JDBC, …)
are hard
• Management and
compliance requirements
are even harder
• Don’t forget about
downtime!
Source: Gartner, November 2016

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EDB’S CONTRIBUTION
• EDB Advanced Server: Oracle compatible Postgres
• Migration tools:
• EDB Migration Portal: Cloud-based migration for schemas and stored
procedures
• EDB Migration Toolkit: One-time data migration
• EDB Replication Server: Change data capture for large migrations with minimal
downtime
• Application drivers: OCL, JDBC, ODBC, .NET, ECPG*Plus
• Management Tools
• EDB Postgres Enterprise Manager
• EDB Failover Manager

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DATABASE COMPATIBILITY FOR ORACLE
• SQL extension support
• Decode, NVL, Substr, NVL2, Date/time
functions
• DDL syntax support
• PL/SQL support – native language
• REF Cursors, Implicit and explicit cursors
• Looping, variable declarations, conditional
statements
• Collections: Associative Arrays, Varrays,
Nested tables
• Pragmas
• Named parameters
• User Defined Exceptions
• Explicit Transaction Control(within sp)
• Tools
• EDB*Plus – SQL*Plus look-a-like
• EDB*Loader – SQL*Loader equivalent
• Oracle-like Data Dictionary
• ALL_, DBA_, USER_ views
• Wait Events
• System and session waits
• Statspack-like reporting
• Features
• Packages
• Stored procedures
• Functions
• Triggers
• Hints
• Hierarchical Queries
• Synonyms – Public and Private
• Sequences
• Rownum
• Users/Roles
• Dynamic SQL
• Materialized Views
• Partitioning
• PL/SQL supplied packages
• 16 DBMS
• 8 UTL
• Data types
• Blobs, Clobs, XMLTYPE, VARCHAR2, NUMBER, CHAR, Integer
• Drivers
• JDBC, ODBC, .NET with Oracle extensions
• OCI & ProC compatible drivers
EPAS 11 (Q4 2018): Pragma Autonomous Transaction!

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DATABASE DRIVERS
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Oracle Compatibility Feature JDBC ODBC .NET OCI
PL/SQL Support
REF_CURSOR - OracleTypes.CURSOR
User-defined Exceptions - vendor code
Named Parameters - parameter names
Data Types- VARCHAR2 , STRUCT, ARRAYS
STRUCT - Enhanced Manipulation
Upper Column Names - (OPTIONAL)
Multiple INOUT/OUT parameters

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PICK YOUR BATTLES
50%+ of migrations are easy …
30% involve more work …
20% are difficult
51% had slight to
no modifications

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WHAT MAKES A GOOD CANDIDATE?
• ORM (Hibernate, Spring, etc. )
• Procedures, Functions, Packages written in PL/SQL
• Ability to modify source code
• Availability of Application Developers
• No use of RAC for scalability
• No need for Flashback

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TYPICALLY MORE DIFFICULT TARGETS
• Moderate candidates
• OCI interface
• Spatial/XML
• Oracle extensions of .NET and ODBC
• Typically difficult candidates:
• ProC interface
• Transaction management control inside PL/SQL
(Commit/rollback/savepoint/exceptions)
• Stored procedures written in Java
• Must have RAC capabilities and Flashback
• Other Oracle proprietary extensions

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DEMO

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DEMO SETUP
Toad for Oracle Toad Edge for
EDB Postgres
(1) Download DDL Extractor
(2) Run
DDL Extractor
(3) Upload Oracle
schema definition
(4) Analyze
schema
(5) Download converted schema
(6) Create schema
(7) Migrate the data
using EDB MTK

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CLOUD OR WHAT?
• EDB Postgres – Same Postgres Everywhere
• Bare metal (Windows, RHEL, CentOS, Linux on Power, SLES, Debian)
• Virtualized deployments (VM Ware)
• Container deployments (OpenShift, Kubernetes)
• Public cloud deployments (AWS, Azure, Alibaba)

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NEXT STEPS
• Sign up for free training:
https://www.enterprisedb.com/free-postgres-training
• Download EDB Postgres Advanced Server (60 day trial)
https://www.enterprisedb.com/software-downloads-
postgres
• Try the EDB Migration Portal
https://migration.enterprisedb.com
• Get in touch info@enterprisedb.com

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QUESTIONS & DISCUSSION
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THANK YOU
info@enterprisedb.com
www.enterprisedb.com
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