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Guide to Migrating from Oracle to SQL Server 2014 and Azure SQL Database

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Guide to Migrating from Oracle to SQL Server 2014 and Azure SQL Database Guide to Migrating from Oracle to SQL Server 2014 and Azure SQL Database SQL Server Technical Article Writers: Yuri Rusakov (DB Best Technologies), Igor Yefimov (DB Best Technologies), Anna Vynograd (DB Best Technologies), Galina Shevchenko (DB Best Technologies) Technical Reviewer: Dmitry Balin (DB Best Technologies) Published: November 2014 Applies to: SQL Server 2014 Summary: This white paper explores challenges that arise when you migrate from an Oracle 7.3 database or later to SQL Server 2014. It describes the implementation differences of database objects, SQL dialects, and procedural code between the two platforms. The entire migration process using SQL Server Migration Assistant (SSMA) v6.0 for Oracle is explained in depth, with a special focus on converting database objects and PL/SQL code. Created by: DB Best Technologies LLC 2535 152nd Ave NE, Redmond, WA 98052 Tel: +1-855-855-3600 E-mail: [email protected] Web: www.dbbest.com Copyright This is a preliminary document and may be changed substantially prior to final commercial release of the software described herein. The information contained in this document represents the current view of Microsoft Corporation on the issues discussed as of the date of publication. 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 presented after the date of publication. This White Paper is for informational purposes only. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS DOCUMENT. Complying with all applicable copyright laws is the responsibility of the user. Without limiting the rights under copyright, no part of this document may be reproduced, stored in or introduced into a retrieval system, or transmitted in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise), or for any purpose, without the express written permission of Microsoft Corporation. Microsoft may have patents, patent applications, trademarks, copyrights, or other intellectual property rights covering subject matter in this document. Except as expressly provided in any written license agreement from Microsoft, the furnishing of this document does not give you any license to these patents, trademarks, copyrights, or other intellectual property. Unless otherwise noted, the example companies, organizations, products, domain names, e-mail addresses, logos, people, places and events depicted herein are fictitious, and no association with any real company, organization, product, domain name, email address, logo, person, place or event is intended or should be inferred. © 2014 Microsoft Corporation. All rights reserved. Microsoft and SQL Server are registered trademarks of Microsoft Corporation in the United States and other countries. The names of actual companies and products mentioned herein may be the trademarks of their respective owners. Contents Introduction ..................................................................................................................... 6 Overview of Oracle-to-SQL Server 2014 Migration ......................................................... 7 Main Migration Steps .................................................................................................. 7 Conversion of Database Objects ................................................................................. 8 Differences in SQL Languages ................................................................................... 9 PL/SQL Conversion .................................................................................................... 9 Data Migration Architecture of SSMA for Oracle ........................................................... 11 Implementation in SSMA ........................................................................................... 11 Solution Layers ......................................................................................................... 11 Client Application ...................................................................................................... 12 Stored Procedures Interface ..................................................................................... 12 Database Layer ......................................................................................................... 12 Migration Executable................................................................................................. 12 Message Handling .................................................................................................... 13 Validation of the Results ........................................................................................... 13 Migrating Oracle Data Types ........................................................................................ 14 Numeric Data Types ................................................................................................. 15 Character Data Types ............................................................................................... 16 Date and Time .......................................................................................................... 16 Boolean Type ............................................................................................................ 17 Large Object Types ................................................................................................... 17 XML Type ................................................................................................................. 17 ROWID Types ........................................................................................................... 18 Migrating Oracle Spatial Data ....................................................................................... 19 Emulating Oracle System Objects ................................................................................ 21 Converting Oracle System Views .............................................................................. 21 Converting Oracle System Functions ........................................................................ 28 Converting Oracle System Packages ........................................................................ 40 Converting Nested PL/SQL Subprograms .................................................................... 60 Inline Substitution ...................................................................................................... 60 Emulation by Using Transact-SQL Subprograms ...................................................... 64 Migrating Oracle User-Defined Functions ..................................................................... 68 Conversion Algorithm ................................................................................................ 68 Converting Function Calls When a Function Has Default Values for Parameters and with Various Parameter Notations ............................................................................. 74 PRAGMA INLINE ...................................................................................................... 76 Migrating Oracle Triggers ............................................................................................. 78 Conversion Patterns ................................................................................................. 80 The Execution Order of Triggers ............................................................................... 99 Compound Triggers ................................................................................................ 100 Emulating Oracle Packages ....................................................................................... 102 Converting Procedures and Functions .................................................................... 102 Converting Overloaded Procedures ........................................................................ 103 Converting Packaged Variables .............................................................................. 104 Converting Packaged Cursors ................................................................................ 104 Converting Initialization Section .............................................................................. 106 Package Conversion Code Example ....................................................................... 107 Converting Packages to Azure SQL DB .................................................................. 108 Conversion of Oracle Materialized Views ................................................................... 114 Sequences Conversion............................................................................................... 117 Migrating Hierarchical Queries .................................................................................... 121 Emulating Oracle Exceptions ...................................................................................... 125 Exception Raising ................................................................................................... 125 Exception Handling ................................................................................................. 127 SSMA Exceptions Migration to SQL Server 2014 .................................................... 128 SSMA Exceptions Migration to Azure SQL DB ........................................................ 130 Migrating Oracle Cursors ...........................................................................................
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