Connect Microsoft SQL Servers with AWS Schema Conversion Tool

You can use AWS SCT to convert schemas, database code objects, and application code from SQL Server to the following targets:

• Amazon RDS for MySQL

• Amazon Aurora MySQL-Compatible Edition

• Amazon RDS for PostgreSQL

• Amazon Aurora PostgreSQL-Compatible Edition

• Amazon RDS for SQL Server

• Amazon RDS for MariaDB

Note

AWS SCT does not support using Amazon RDS for SQL server as a source.

You can use AWS SCT to create an assessment report for the migration of schemas, database code objects, and application code from SQL Server to Babelfish for Aurora PostgreSQL, as described following.

Topics

• Privileges for Microsoft SQL Server as a source
• Using Windows Authentication when using Microsoft SQL Server as a source
• Connecting to SQL Server as a source
• Converting SQL Server to MySQL
• Migrating from SQL Server to PostgreSQL with AWS Schema Conversion Tool
• Migrating from SQL Server to Amazon RDS for SQL Server with AWS Schema Conversion Tool

Privileges for Microsoft SQL Server as a source

The privileges required for Microsoft SQL Server as a source are as follows:

• VIEW DEFINITION

• VIEW DATABASE STATE

The VIEW DEFINITION privilege enables users that have public access to see object definitions. AWS SCT uses the VIEW DATABASE STATE privilege to check the features of the SQL Server Enterprise edition.

Repeat the grant for each database whose schema you are converting.

In addition, grant the following privileges on the master database:

• VIEW SERVER STATE

• VIEW ANY DEFINITION

AWS SCT uses the VIEW SERVER STATE privilege to collect server settings and configuration. Make sure that you grant the VIEW ANY DEFINITION privilege to view endpoints.

To read information about Microsoft Analysis Services, run the following command on the master database.

EXEC master..sp_addsrvrolemember @loginame = N'<user_name>', @rolename = N'sysadmin'

In the preceding example, replace the <user_name> placeholder with the name of the user that you granted with the privileges before.

To read information about SQL Server Agent, add your user to the SQLAgentUser role. Run the following command on the msdb database.

EXEC sp_addrolemember <SQLAgentRole>, <user_name>;

In the preceding example, replace the <SQLAgentRole> placeholder with the name of the SQL Server Agent role. Then replace the <user_name> placeholder with the name of the user that you granted with the privileges before. For more information, see Adding a user to the SQLAgentUser role in the Amazon RDS User Guide.

To detect log shipping, grant the SELECT on dbo.log_shipping_primary_databases privilege on the msdb database.

To use the notification approach of the DDL replication, grant the RECEIVE ON <schema_name>.<queue_name> privilege on your source databases. In this example, replace the <schema_name> placeholder with the schema name of your database. Then, replace the <queue_name> placeholder with the name of a queue table.

Using Windows Authentication when using Microsoft SQL Server as a source

If your application runs on a Windows-based intranet, you might be able to use Windows Authentication for database access. Windows Authentication uses the current Windows identity established on the operating system thread to access the SQL Server database. You can then map the Windows identity to a SQL Server database and permissions. To connect to SQL Server using Windows Authentication, you must specify the Windows identity that your application is using. You must also grant the Windows identity access to the SQL Server database.

SQL Server has two modes of access: Windows Authentication mode and Mixed Mode. Windows Authentication mode enables Windows Authentication and disables SQL Server Authentication. Mixed Mode enables both Windows Authentication and SQL Server Authentication. Windows Authentication is always available and cannot be disabled. For more information about Windows Authentication, see the Microsoft Windows documentation.

The possible example for creating a user in TEST_DB is shown following.

USE [TEST_DB]
CREATE USER [TestUser] FOR LOGIN [TestDomain\TestUser]
GRANT VIEW DEFINITION TO [TestUser]
GRANT VIEW DATABASE STATE TO [TestUser]

Using Windows Authentication with a JDBC connection

The JDBC driver does not support Windows Authentication when the driver is used on non-Windows operating systems. Windows Authentication credentials, such as user name and password, are not automatically specified when connecting to SQL Server from non-Windows operating systems. In such cases, the applications must use SQL Server Authentication instead.

In JDBC connection string, the parameter integratedSecurity must be specified to connect using Windows Authentication. The JDBC driver supports Integrated Windows Authentication on Windows operating systems through the integratedSecurity connection string parameter.

To use integrated authentication

1. Install the JDBC driver.

2. Copy the sqljdbc_auth.dll file to a directory on the Windows system path on the computer where the JDBC driver is installed.

   The sqljdbc_auth.dll files are installed in the following location:

   <installation directory>\sqljdbc_<version>\<language>\auth\

When you try to establish a connection to SQL Server database using Windows Authentication, you might get this error: This driver is not configured for integrated authentication. This problem can be solved by performing the following actions:

• Declare two variables that point to the installed path of your JDBC:

  variable name: SQLJDBC_HOME; variable value: D:\lib\JDBC4.1\enu (where your sqljdbc4.jar exists);

  variable name: SQLJDBC_AUTH_HOME; variable value: D\lib\JDBC4.1\enu\auth\x86 (if you are running 32bit OS) or D\lib\JDBC4.1\enu\auth\x64 (if you are running 64bit OS). This is where your sqljdbc_auth.dll is located.

• Copy sqljdbc_auth.dll to the folder where your JDK/JRE is running. You may copy to lib folder, bin folder, and so on. As an example, you might copy to the following folder.

  [JDK_INSTALLED_PATH]\bin;
  [JDK_INSTALLED_PATH]\jre\bin;
  [JDK_INSTALLED_PATH]\jre\lib;
  [JDK_INSTALLED_PATH]\lib;

• Ensure that in your JDBC library folder, you have only the SQLJDBC4.jar file. Remove any other sqljdbc*.jar files from that folder (or copy them to another folder). If you are adding the driver as part of your program, ensure that you add only SQLJDBC4.jar as the driver to use.

• Copy sqljdbc_auth.dll the file in the folder with your application.

Note

If you are running a 32-bit Java Virtual Machine (JVM), use the sqljdbc_auth.dll file in the x86 folder, even if the operating system is the x64 version. If you are running a 64-bit JVM on a x64 processor, use the sqljdbc_auth.dll file in the x64 folder.

When you connect to a SQL Server database, you can choose either Windows Authentication or SQL Server Authentication for the Authentication option.

Connecting to SQL Server as a source

Use the following procedure to connect to your Microsoft SQL Server source database with the AWS Schema Conversion Tool.

To connect to a Microsoft SQL Server source database

1. In the AWS Schema Conversion Tool, choose Add source.

2. Choose Microsoft SQL Server, then choose Next.

   The Add source dialog box appears.

3. For Connection name, enter a name for your database. AWS SCT displays this name in the tree in the left panel.

4. Use database credentials from AWS Secrets Manager or enter them manually:

   • To use database credentials from Secrets Manager, use the following instructions:

     1. For AWS Secret, choose the name of the secret.

     2. Choose Populate to automatically fill in all values in the database connection dialog box from Secrets Manager.

     For information about using database credentials from Secrets Manager, see Configuring AWS Secrets Manager in the AWS Schema Conversion Tool.

   • To enter the Microsoft SQL Server source database connection information manually, use the following instructions:

     Parameter	Action
     Server name	Enter the Domain Name Service (DNS) name or IP address of your source database server. You can connect to your source SQL Server database using an IPv6 address protocol. To do so, make sure that you use square brackets to enter the IP address, as shown in the following example. [2001:db8:ffff:ffff:ffff:ffff:ffff:fffe]
     Server port	Enter the port used to connect to your source database server.
     Instance name	Enter the instance name for the SQL Server database. To find the instance name, run the query SELECT @@servername; on your SQL Server database.
     Authentication	Choose the authentication type from Windows Authentication and SQL Server Authentication.
     User name and Password	Enter the database credentials to connect to your source database server. AWS SCT uses the password to connect to your source database only when you choose to connect to your database in a project. To guard against exposing the password for your source database, AWS SCT doesn't store the password by default. If you close your AWS SCT project and reopen it, you are prompted for the password to connect to your source database as needed.
     Use SSL	Choose this option to use Secure Sockets Layer (SSL) to connect to your database. Provide the following additional information, as applicable, on the SSL tab: Trust server certificate: Select this option to trust the server certificate. Trust store: The location of a trust store containing certificates. For this location to appear in the Global settings section, make sure to add it.
     Store password	AWS SCT creates a secure vault to store SSL certificates and database passwords. Enabling this option lets you store the database password and to connect quickly to the database without having to enter the password.
     Sql Server Driver Path	Enter the path to the driver to use to connect to the source database. For more information, see Installing JDBC drivers for AWS Schema Conversion Tool. If you store the driver path in the global project settings, the driver path doesn't appear on the connection dialog box. For more information, see Storing driver paths in the global settings.
     Windows Authentication library	Enter the path to the sqljdbc_auth.dll file. By default, this file is installed in the following location: <installation directory of the JDBC driver>sqljdbc_<version>\<language>\auth\

5. Choose Test Connection to verify that AWS SCT can connect to your source database.

6. Choose Connect to connect to your source database.