Database migration from Oracle 11g to SQL Server 2012

1. Database
Migration
Oracle11g to
SQL Server
2008/2012

2. Key Aspects of a Migration
 What is migration?
 Conversion of an existing application environment
into a new architecture by preserving data and
functionality of the old architecture
 What are the key components in a migration?
 Schema (table definitions)
 Data (content of tables)
 Application
 What are the major steps in a migration?
 Analysis
 Migration
 Testing
 Deployment

3. Migration - Oracle11g to SQL Server
 Migration Process
 Data Migration Architecture of SSMA for
Oracle
 Migrating, emulating and validate data
using SSMA

4. Process
1. Migrating Schema and objects
2. Migrating Business Logic
3. Migrating the Clients applications

6. Migrating Schema and Objects
Migratable Objects in the database
 Tables and Data
 Primary Keys
 Check Constraints
 Foreign Keys
 Indexes
 Views
 Groups / Users

7. Migratable Objects in the
database
• Databases
• Stored Procedures
• Triggers
• Grants
• Rules
• Defaults
• User Defined Types

8. Migrating the Business Logic
Business Logic in the database in SQL Server
 Primarily in Transact-SQL (T/SQL)
 Triggers, Stored Procedures
 Conversion the PL/SQL to SQL handled by SSMA
 Extended Stored Procedures
 Callouts from the database packaged as DLL’s
 Manual conversion process
 .NET CLR Stored Procedures
 Stored procedures written in a .NET language

9. Migrating the Clients
applications
 Adapt the way how to call the business
logic
 Managing Result sets
 Adapt the way how to access the
database
 Error Handling
 In some cases need some rewriting

10. Migration Tools Support
8. Project 2. Assessment
Support
Migration
Lifecycle 3. Migration
6. Customer
Acceptance 4. Testing
5. Optimization

11. Migration - Oracle11g to SQL
Server
 Migration Process
 Data Migration Architecture of SSMA for
Oracle
 Migrating, emulating and validate data
using SSMA

12. What is the SSMA?
 The free Microsoft SQL Server Migration
Assistant (SSMA) for Oracle speeds the
migration process.
 SSMA converts Oracle database objects
(including stored procedures) to
SQL Server database objects, loads those
objects into SQL Server, migrates data
from Oracle to SQL Server, and then
validates the migration of code and data.

13. Data Migration Architecture of
SSMA
 Understanding this mechanism can help
you set up the proper environment for
SSMA data migration. It also helps you to
better control, monitor, and optimize the
process.

15. Migration Capabilities
 SSMA enables you to:
 Converts the selected Oracle objects to SQL
Server syntax, and then creates a report that
shows how successful the conversion was.
 Converts the selected Oracle objects to SQL
Server objects.
 Migrates data from the Oracle database to
SQL Server. Before you must convert the
Oracle schemas to SQL Server schemas, and
then load the objects into SQL Server.

16. Migration Capabilities
 Synchronizes the objects between
Oracle Metadata Explorer and SQL
Server Metadata Explorer.
 Creating and working with test cases,
repository, and backup management
system.
 Parses and transforms stored procedures,
triggers, and views to SQL
 Monitor the status of the migration via
reports and messages

17. SSMA
1. Create a new SSMA project.
2. Connect to the Oracle database server.
3. Connect to an instance of SQL Server.
4. Map Oracle database schemas to SQL
Server database schemas.
5. Create assessment reports to assess
database objects for conversion and
estimate the conversion time.
6. Convert Oracle database schemas into
SQL Server schemas.
7. Load the converted database objects
into SQL Server.
8. Migrate data to SQL Server.

18. Migration - Oracle11g to SQL
Server
 Migration Process
 Data Migration Architecture of SSMA for
Oracle
 Migrating, emulating and validate data
using SSMA

20. Migration Process available
 Data type
 Emulating Oracle System Objects
 Converting Nested PL/SQL Subprograms
 Migrating Oracle User-Defined Functions
 Emulating Oracle Packages
 Simulating Oracle Transactions

21. Migration Process
 Compares schema and data between
source and migrated SQL database
 Supports verification of tables, indexes,
function, stored procedures, and triggers, and
view objects
 Validates data in migrated SQL database
against source database
 Generates a Report of schema and data
verification failures summarized by object
name and type

22. Conclusions
 This migration guide covers the differences
between Oracle and SQL Server 2008 database
platforms, and it includes the steps necessary to
convert an Oracle database to SQL Server.
 It explains the algorithms that SSMA for Oracle
uses to perform this conversion so that you can
better understand the processes that are
executed when you run the SSMA Convert
Schema and Migrate Data commands.
 For those cases when SSMA does not handle a
particular migration issue, approaches to manual
conversion are included.