Sql Server Migration

Upgrading SQL Server 6.5: A Comprehensive Migration Guide

Upgrading from SQL Server 6.5 to a more recent version, particularly SQL Server 2005, can seem daunting and somewhat absurd given the significant time gap between these two versions. However, if you find yourself in this situation, you’re not alone, and with the right approach, it can be executed smoothly, ensuring your data is preserved and your applications continue to function as expected.

In this article, we will outline a step-by-step guide that will help you navigate this upgrade process, especially when direct upgrade paths may not exist.

Understanding the Challenges of Upgrading

Migrating from SQL Server 6.5 to SQL Server 2005 isn’t as straightforward as one might hope. Here are some common challenges you might encounter:

  • Compatibility Issues: Many features in 6.5 are deprecated in later versions, leading to possible errors when scripts are executed.
  • DTS to SSIS Transition: The Data Transformation Services (DTS) that you may have used in 6.5 has been replaced by SQL Server Integration Services (SSIS), necessitating a new approach to data handling.
  • Complex Stored Procedures: Legacy procedures and queries may contain elements that aren’t compatible with 2005, requiring thorough review and modification.

Step-by-Step Migration Process

To ensure a smooth upgrade, follow these clear steps:

1. Prepare for Backup

  • Backup Your Databases: Start by backing up both the database in question and the Master database from SQL Server 6.5. This precautionary step ensures that you have safe copies of your critical data.

2. Convert to SQL Server 2000 Format

  • Utilize SQL Server 2000 Upgrade Tools: Use SQL Server 2000’s instcat.sql script against your 6.5 Master database. This conversion allows the SQL Server 2000 OLE DB provider to connect to 6.5 effectively.

3. Data Transfer

  • DTS Package Creation: Use SQL Server 2000’s standalone “Import and Export Data” wizard to generate a Data Transformation Services (DTS) package. Connect to SQL Server 6.5 using OLE DB and copy all the tables into a new SQL Server 2005 database.

4. Script Out Database Structure

  • Scripting Indexes and Triggers: Using 6.5’s Enterprise Manager, script out all indexes and triggers to a .sql file. Then execute this script against your newly created SQL Server 2005 database using Management Studio.

5. Transfer Stored Procedures

  • Script Stored Procedures: Script out all stored procedures from SQL Server 6.5 and execute these scripts against the SQL Server 2005 database. Be prepared to debug and correct any compatibility issues.

6. Address Compatibility Issues

  • Identify and Fix Issues: As you execute stored procedure scripts, watch out for common problems like non-ANSI joins and quoted identifier issues. You will likely need to modify these procedures to ensure they are compatible with SQL Server 2005.

7. Recreate Logins

  • Manage User Logins: Finally, recreate the logins from SQL Server 6.5 in SQL Server 2005 and assign appropriate permissions to maintain security and usability.

Final Thoughts on the Upgrade Process

The migration from SQL Server 6.5 to SQL Server 2005 may require patience, especially when correcting stored procedures and other compatibility issues. However, once completed, you’ll notice significant improvements in performance. The efficiency of Management Studio compared to the outdated Query Analyzer and 6.5 Enterprise Manager is a welcome upgrade—queries that previously took far too long will run significantly faster.

With these guidelines, you should be well-equipped to tackle your migration. Whether you’re transitioning because of server issues or simply wanting to modernize your database system, taking these steps will help ensure a successful upgrade.

If you’re still facing challenges or have specific questions about your migration, don’t hesitate to reach out to your database administrator or IT team for further assistance!