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
5. Migrating Schema and Objects
Migratable Objects in the database
Tables and Data
Primary Keys
Check Constraints
Foreign Keys
Indexes
Views
Groups / Users
6. Migratable Objects in the
database
• Databases
• Stored Procedures
• Triggers
• Grants
• Rules
• Defaults
• User Defined Types
7. 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
8. 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
9. Migration Tools Support
8. Project 2. Assessment
Support
Migration
Lifecycle 3. Migration
6. Customer
Acceptance 4. Testing
5. Optimization
10. Migration - Oracle11g to SQL
Server
Migration Process
Data Migration Architecture of SSMA for
Oracle
Migrating, emulating and validate data
using SSMA
11. 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.
12. 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.
13. 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.
14. 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
15. 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.
16. Migration - Oracle11g to SQL
Server
Migration Process
Data Migration Architecture of SSMA for
Oracle
Migrating, emulating and validate data
using SSMA
17.
18. 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
19. 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
20. 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.
