A Guide to SQL Server Migration: Made Easy for 2024

It may seem challenging to migrate business-critical databases because it requires tremendous preparation and expertise. However, you can implement a few best practices to reduce the amount of work involved with SQL Server Migration and, simply put, to reduce the amount of stress.

This article will describe the SQL Server Migration process and how data migration tools, such as Database Migration Assistant Tool, will assist in accessing, planning, for SQL Server Migration.

What is SQL Server Migration?

Microsoft SQL Server database migration involves moving data to or from a database. Some reasons for moving a database or restoring it include:

• Moving to a new server.
• Switching from one instance of SQL to another.
• Setting up a development server.
• Restoring a backup database.

Steps Involved in Migrating Databases

Typically, there are four significant steps involved in migrating databases:

• Extraction: Obtaining data from a source server or database and sending it to an intermediate server.
• Standardize: Compatibility issues with the data type could be resolved by matching the source to the destination formats, while metadata could be captured accurately.
• Aggregate and Cleanse: This process entails de-duplicates records and/or calculating derived fields.
• Load: Moving the processed, aggregated, and transformed data into the target database.

For accurate data migration, each stage must be carefully planned and tested before execution. Unfortunately, this process is quite time-consuming, mainly if you write your own code and stored procedures and design your internal data migration process. 

So, a better strategy would be to use an enterprise-grade data migration tool such as Microsoft’s database migration assistant tool (DMA) to save time and reduce the likelihood of errors.

SQL Server Migration using Microsoft’s Database Migration Assistant Tool

Our discussion in this section examines how DMA can be helpful for the initial assessment of SQL Server Migration before it is actually carried out. Using Database Migration Assistant, you can evaluate, plan, and execute an on-premise or cloud upgrade of older versions of SQL Server, starting with SQL Server 2005.

SQL Server Migration: Using Database Migration Assistant

• After installing DMA, you will see the screen below when you run DMA on either a client or server machine. Then, on the left side of the screen, click the “+” sign. If this is your first time opening the wizard, you must create a new project. The interface at startup looks like this:

• Once you click the “+” button, a form for selecting an assessment or migration task will appear. Here we will choose assessment since the migration itself is not yet underway. However, analyzing the reports and examining all the facts are essential steps before starting the actual migration.

• Select the Assessment option and give it a name to create a project. For example, SQL2K14toSQL2K17 has been used by me.

• The next step is to select the type of server you want to use for the source and target:

Source Server Type refers to the kind of data source you plan to migrate. As you can see, I selected SQL Server. Other data sources can be migrated using the SQL Server Migration Assistant (SSMA) or Azure Database Migration Service (DMS).

Target Server Type specifies the type of SQL Server to use, either SQL Server or Azure SQL Database. I chose SQL Server.

• Click on the “create” button at the bottom of the screen once you have completed all the options.

• If you want to recommend new features and fix compatibility issues, you can check the boxes. There is no check box for Check feature parity when the drop-down selection is selected. If you choose “SQL Server 2017 on Linux” from the drop-down list, the Check feature parity check box will be enabled:

• You will need to connect to the Source SQL Server and enter the server details and authentication type. In addition to supplying the required information, you must ensure that the encryption connection is enabled in SQL Server. You will need to uncheck the checkbox on the given screen if the encryption connection is not allowed.

• At the bottom of the screen, you can see the permissions required for successful assessment on SQL Server instances.  

• To connect the source SQL Server, click the “Connect” button:

• When it connects successfully, it will show you all the available databases on the server. First, select the database(s) you want to migrate. Then, depending on your needs, you can either choose one database at a time or all the databases together.

As part of the assessment, I selected both databases available on my test server. Then, I land on the next screen after clicking the add button, which will begin the migration assessment.

Based on the size and number of databases to be assessed, the assessment may take a while. Therefore, the Database Migration Assistant will take a moment to return the results of this assessment. During that time, you can observe whether a compatibility report will appear or if a feature recommendation will be shown, and whether you will be able to search for specific databases. You can find these filters under the left-hand column:

As soon as everything is completed, you see that the assessment report is divided into multiple sections.

A visual indicator on the screen immediately lets you know if a database can be migrated (orange rectangle in the following screen capture). Similarly, the tool runs an assessment task for each compatibility level option from the current one to the one corresponding to the destination’s SQL Server version (zone shown in purple on the following screen capture). 

In addition, for each compatibility level, we will see what the tool discloses in terms of breaking changes, behavior changes, and deprecated features, and we will be able to click on each discovery to get a more in-depth description, as well as what objects are affected (circled in green in the screenshot). Last but not least, we can perform these three actions in Database Migration Assistant:

• Start over with the assessment.
• Delete the assessment results
• Export the assessment report (as JSON or CSV)

SQL Server Migration: The Migration Process

• On the left sidebar, click the “+” button to create a new project, but this time for migration purposes.

• We will now click the “Create” button, and we will be directed to a form where we can enter the details of our source and target server connections. Finally, we can click on the “Next” button when we are done.

• Again, note the text in the “SQL Server permissions” area that specifies the exact permissions the tool requires to operate as expected. DMA will then ask for a list of databases to migrate if the credentials provided are correct and connect to the source and destination server instances. Using the backup-restore method, Database Migration Assistant will actually do the migration for you: as shown on the following screen.

The following parameters are intrinsic to the technique:

• The location of the backup files in the shared folder
• Data files’ destination path
• The destination of transaction logs

• The parameters listed here will be applied to all databases in the tree panel on the left. By clicking on a particular database in the tree hierarchy, we can specify different values for these parameters.

• On the right side of the screen, we see an option that tells DMA to perform a backup, then copy the backup files to a location accessible by the service account running SQL Server on the destination server.read. Clicking on that checkbox adds the following to the view:

• DMA asks us to specify which logins should be kept once we choose the databases to migrate and set the parameters for backup-restore migration. This tool checks for existing logins and tells you whether they are ready to be moved if they already exist or can’t be moved. 

• We can click the “Start Migration” button once we are ready to begin our migration. You will be pleased to see the following view with 0 failed operations if the migration is successful:

• In a “migration details” column, we can check the logging information for each object. Then, whenever something goes wrong (with warnings or errors), we can look at a detailed log:

Database Migration Methods for SQL Server

To ensure a seamless migration of SQL Server databases to a new server, various methods are available. Below are step-by-step instructions for each method:

1. Move SQL Database by Backup and Restore Using SSMS

This method involves two parts: backing up the server data and restoring it on the new system/server.

Part 1: Taking the Backup of SQL Server Database

1. Launch SQL Server Management Studio (SSMS) and navigate to Object Explorer.
2. Select “Databases,” right-click on the database intended for migration, then click on “Tasks” > “Back Up.”
3. In the Backup Database dialog, keep the Backup type as “Full” and Destination as “Disk.” Click “Add” to set the backup destination, then click “OK.”

After creating the backup, proceed to restore it on the new server/system.

Part 2: Restore Backup Using SSMS

1. Start SSMS and connect to the database.
2. Right-click on the database, select “Tasks” > “Restore” > “Database.”
3. In the Restore Database dialog, select “From device” under Source for restore, then click “Browse” to add the backup file.
4. Keep Backup media as “File,” click “Add” to choose the backup file, then click “OK.”
5. Under the “Select a page” panel in the Restore Database wizard, click on “Options” to specify Restore options and Recovery state. Click “OK” to proceed.

2: Copy SQL Server Database to Another Server Using Copy Wizard

1. Launch SSMS and ensure it’s connected to the source server.
2. Right-click on “Database” and select the desired database, then click “Tasks” > “Copy Database.”
3. Follow the on-screen instructions, providing the Source name, selecting Server authentication mode, and configuring the connection to the source Server.

3: Using Import and Export Wizard of SSMS

1. Launch SSMS, right-click on the database, and select “Tasks.”
2. Choose “Data source,” “Server name,” and “Database.”
3. Select the destination and specify tables/views from the source, then click “Next.”
4. Review and confirm the exported files.

4: Generating Scripts to Migrate SQL Server Data

1. Launch SSMS, right-click on the database, and select “Tasks” > “Generate Scripts.“
2. Select specific database objects under “Choose Objects.“
3. Configure output type and advanced options, then click “OK.”

5: Error-Free Migration of SQL Server Databases to a New Server in Automated Way

If manual methods fail or data volume is large, consider using an automated SQL migrator like SysTools SQL Server Migrator.

6: Migrate SQL Databases to a New Server Using SysTools SQL Migrator

1. Install and Launch SysTools SQL Migrator.
2. Open the database files in the software and choose the export mode (Offline/Online).
3. Perform server authentication and select the database.
4. Preview database objects and click “Export” to initiate the migration process.

Additional Reads

• Integrating APIs with SQL Server
• Exploring SQL Server Replication: A Comprehensive Tutorial
• How to Connect to the Remote SQL Server? | 4 Easy Steps

Conclusion

Several factors motivate businesses to migrate their SQL databases. It could be for building a new Data Warehouse, overhauling your existing systems, or upgrading your database systems, for example. Therefore, it is imperative to carefully plan and test migrations when migrating data between a source and a target to avoid data loss.

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