The following diagram illustrates the architecture and tasks we accomplish in this post.įor this walkthrough, you should have the following prerequisites: This allows for migrations that are faster, lower risk, and more cost-effective. With Babelfish, the effort required to migrate applications running on SQL Server 2005 (TDS 7.1 wire protocol) or newer to Aurora is greatly reduced. Although other migration options facilitate the conversion of the database schema from SQL Server to PostgreSQL, they don’t take care of the laborious process of rewriting application code and stored procedures. This ability to run existing SQL Server code is the biggest difference between Babelfish and traditional migration services, including those offered by AWS, such as conversions using the AWS Schema Conversion Tool (AWS SCT). Babelfish provides support for some system views and catalogs and extends the PostgreSQL type system to ensure correctness and compatibility with SQL Server data types. Support for T-SQL includes elements such as static cursors, triggers, stored procedures, and functions. With Babelfish, you can run T-SQL queries on the Aurora PostgreSQL-compatible engine because a new endpoint is created that understands the Tabular Data Stream (TDS) wire protocol and the SQL Server dialect. Typically, you can use the same ORM framework. You don’t need to change your database drivers. Now, in this post we show you how modernize the SQL Server database to use Aurora PostgreSQL-compatible by configuring Babelfish and making changes to the SQL code.īabelfish allows you to run your application against Amazon Aurora PostgreSQL database with a fraction of the code changes required in a traditional migration. In Part 2, we showed how to deploy the previously re-architected application to Amazon Elastic Container Service (Amazon ECS) and run it as a task in the ECS cluster using Amazon Relational Database Service (Amazon RDS) for SQL Server. In Part 1, we walked you through a step-by-step approach to re-architect a legacy ASP.NET MVC application and port it to. Babelfish is a capability of Amazon Aurora that allows it to understand the SQL Server dialect. This post is part three of a series, and shows the steps to modernize a legacy SQL Server database to Amazon Aurora PostgreSQL-Compatible Edition using Babelfish.
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