SESSION CODE: DAT304
Dandy Weyn
Sr. Technical Product Manager
Microsoft Corp.
MIGRATION DONE RIGHT -
MIGRATING TO SQL SERVER ON PREMISE AND IN THE CLOUD
(c) 2011 Microsoft. All rights reserved.
Upgrade versus Migration…
Why
Upgrade OR Migrate?
What is Upgrade?
Existing version of SQL Server to a higher version
(c) 2011 Microsoft. All rights reserved.
Extend any data
On Premises & Private cloud
End user analytics
Common Architecture
Public Cloud
Database Migration Process
Database Discovery
Non-code requirements (AlwaysOn, Perf, locale,
maintenance, dependencies, etc…)
► Migration Impact Assessment
Schema Conversion
Data Migration
Embedded SQL Statement
Database connectivity
User Login and Permission
Migration Assistant
Microsoft Assessment and Planning (MAP) Toolkit
►
►
Agentless inventory and assessment
Provides readiness assessments for
•
•
•
•
►
Windows 7, Office 2010,
Internet Explorer
Windows Server 2008 R2, Hyper-V
Windows Azure Platform
SQL Server, Oracle, MySQL, and Sybase Discovery
Generates customizable proposals and reports
Ideal discovery tool for Database Migration
And Consolidation Projects
http://www.microsoft.com/map
SQL Server Migration Assistant
SQL Server Migration Assistant
Automates and simplifies all phases of database migration
Migration Analyzer
Assess migration complexity
Schema Converter
Migrate schema and business logic
Data Migrator
Migration Tester
Migrate data
Validate converted database
Support migration from Oracle, Sybase, MySQL and Access database
The
complexity of Migration…
“Crikey!
Your language is slightly different …”
“you triggered me BEFORE… instead
of AFTER”
“I am a variable character too”
“The way I deal with dates is different too”
“I am a total package”
“What’s that sequence?”
I said, "Do you speak-a my language?"
(c) 2011 Microsoft. All rights reserved.
Database Migration Challenges
The challenge of feature and non-standard mappings
UserD
b
SysDb
PL/SQL
Master
A closer look at Schema Conversion
SSMA Migration Best Practices
Customize SSMA project settings
Customize mapping behavior
Customize feature behavior
Customize migration project
Customize Data Type Mapping
Leverage SQL Server native Datatypes
Use the smallest datatype
Rethink data type mapping and advantages
Re-Engineer Code
Rethink Stored Procedure Logic
Rethink Function Logic
Optimize Infrastructure, People and Processes
Get
SQL SERVER MIGRATION ASSISTANT
FREE
http://blogs.msdn.com/b/ssma/
SSMA Migration Paths
To the
Cloud Migrations
Data Migration Scenarios
One-Off
Scenarios
•
Migration to/from SQL
Server
Transfer between SQL
Azure servers/databases
•
Tools
• BCP
• SSMS Generate script wizard
• SQL Server Import & Export Data
• SSIS
• SQL Azure Database Copy
• SQL Azure Migration Wizard
• DAC
• DAC Logical Imort/Export
• SQL Server Migration Assistant
On-Going
•
•
•
•
Publish to cloud
Share between on-prem
and cloud apps
Data distribution
One-way or two-way
•
•
SQL Azure Data Sync
Sync Framework
Scenarios and examples
On-Premises
Cloud
Application
SQL
Server
•
•
•
Single location, branch
office, retail
Application
•
•
SQL •
Server
One-way publish, twoway sharing, aggregation
Reporting
Web site reference data
Geo-located web apps
Traffic manager
Moving to and From SQL Azure
Resources
http://www.microsoft.com/sqlserver/en/us/product-info/migration.aspx
ssmahelp@microsoft.com
http://social.msdn.microsoft.com/Forums/en-US/sqlservermigration
http://blogs.msdn.com/b/ssma/
QUESTION & ANSWER SESSION
(c) 2011 Microsoft. All rights reserved.
Migration Success stories and customer evidence
What some of our customers say …
We moved nine-terabyte system migrated from Oracle using SSMA that resulted in significant TCO
savings.
We were going for Better - Faster - Cheaper. And we attained all three!
We not only reduce $63,000 in annual licensing cost but we also improved uptime.
We improved development productivity and lowered cost after migrating our missioncritical system from Oracle.
http://www.microsoft.com/casestudies
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Dandy Weyn
dandyw@microsoft.com
Sr. Technical Product Manager
Database Track PM TechReady13
http://www.ilikesql.com
Twiiter @ilikesql
© 2010 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks
in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing
market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this
presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.
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APPENDIX
Schema Conversion Details
(c) 2011 Microsoft. All rights reserved.
Converting Data Types
►
Migration Challenges
–
–
–
Dynamic precision and scale
• NUMBER, VARCHAR2
Wider range of supported value
• Oracle stores from 4712 while SQL
Server’s DATETIME stores from
01/01/1753 and DATETIME2 stores from
01/01/0001
• TIMESTAMP has nanosecond precision
while DATETIME2 stores up to 100
nanoseconds
Complex data type
• User defined type: Object type,
collections
►
SSMA Conversion Approach
–
–
–
Convert to maximum possible
• NUMBER converted to float(53), which
has the maximum precision from
SQL Server floating-point numbers
• VARCHAR2 converted to VARCHAR(MAX)
Project setting
• specify how to handle out of bound
values during data migration
– Error, null, closest supported value
Raise conversion message when user defined
type is used in table, view, and PL/SQL program
Converting Procedures and Functions
►
Migration Challenge
–
–
–
–
No big differences between procedure and function
in Oracle
– error handling
– DML statement: update, insert, delete
– temporary table access
– calling procedures (except extended
procedures)
Parameter
• Support IN, OUT and IN OUT parameters
• Scale and precision not specified
• Parameter overloading
Procedures don’t return result sets
• Use cursors, records and collection as output
parameter
Autonomous Transaction
►
SSMA Conversion Approach
–
–
Functions converted to function and
stored procedure when containing
operations forbidden in functions are
needed
– such procedures have
$IMPL suffix
Extended stored procedure to call
procedure within function and emulate
autonomous transaction
– master..xp_ora2ms_exec2
Converting Oracle Packages
► Migration Challenge
– Oracle specific implementation to
logically group schema objects
– Compare to SQL Server’s Schema:
•
•
•
no concept of global package objects
–
variables and constants
–
private functions, procedures, types
–
e.g. invalid because of compilation
errors
no concepts of private/public objects
no concept of package state
– Module nesting
•
•
definition of procedures/functions
inside other modules
► SSMA Conversion Approach
– Convert to procedure and function
with the following naming convention
•
dbo.PACKAGENAME$MODULENAME
– Emulate package variable by storing
values in a central table
– Inline substitution for module nesting
Converting Oracle Sequences
► Migration Challenge
– Generate number sequence – not
bound to a table
– NEXTVAL method to generate next
value of a sequence
– CURRVAL method to retrieve current
value of the sequence (bound to
current session scope)
► SSMA Conversion Approach
– One table per sequence
•
•
uses IDENTITY
get values through
procedures/functions
– Maintenance
•
additional procedures to drop/create
•
•
min/max values are not enforced
functions are slower
– Limitation
–
•
use extended stored procedure to
exec procedure
some options not available
–
NOCYCLE, NOCACHE, NOORDER
SQL Server code name Denali supports
SEQUENCES
Converting Oracle Triggers
► Migration Challenge
–
FOR EACH ROW trigger
•
•
–
SSMA Conversion Approach
–
–
Possible to modify the actual field values
that will be stored in the table, or even
cancel the execution
Allow multiple trigger for each events
(INSERT or UPDATE)
•
SQL Server only support one trigger per
event
Row-level triggers are emulated with a cursor
loop and generate ROWID for table with
trigger.
BEFORE triggers are converted to INSTEAD OF
trigger
•
Before trigger
•
–
The most common Oracle trigger which fires
for each row of the source statement.
SQL Server only supports statement level
trigger
►
•
–
Incorporate triggering statement into the
trigger body
Cursor loop to handle affected multiple rows
Logic from all BEFORE triggers on that table
into a single target trigger.