Microsoft Azure launched a database migration service that allows businesses to migrate their Oracle or Microsoft SQL Server databases to the Azure cloud.

In a blog post, Microsoft’s Scott Guthrie, executive vice president in the cloud and enterprise group, said the new service “seamlessly migrates third-party and SQL Server databases into Azure SQL Database with near-zero application downtime.”

The company also announced two Azure database offerings, Azure Database for MySQL and Azure Database for PostgreSQL, which run as a service. Guthrie said they will “ensure developers can use their favorite database with Azure,” and are “built-in at no extra cost or configuration.”

The Azure database migration service sounds like a similar play by Amazon Web Services (AWS) in 2015, which saw companies move 1,000 databases over to AWS in week one, according to Business Insider. Not all of these were Oracle customers.

But as the database leader in customer-run data centers, Oracle is most at risk from the new Microsoft offerings, Patrick Moorhead, an analyst with the research firm Moor Insights & Strategy, told Fox Business.

At press time, Oracle did not respond to a request for comment.

The new database migration service also comes as Microsoft is battling AWS for the title of top cloud services provider. While AWS continues to dominate the market, its growth is slowing as competitors like Microsoft Azure, IBM Cloud, Google Cloud Platform, and Oracle boost their cloud services.

Meanwhile, Microsoft Azure’s market share is on the uptick — the company reported fiscal third quarter sales increased 93 percent. And it claims to be the fastest growing cloud provider with over 120,000 new customers every month.

Oracle also claims to be the fastest growing cloud company, and it’s aggressively buying up cloud-service startups and beefing up its cloud offerings, which include cloud software-as-a-service (SaaS), platform-as-a-service (PaaS), and infrastructure-as-a-service (IaaS).

Last month, Oracle acquired two startups, advertising analytics startup Moat and Wercker, which offers a container-centric and cloud-native automation platform. These acquisitions follow Oracle’s 2016 purchase of NetSuite for $9.3 billion.

In March, Oracle integrated its cloud services with its on-premises network-attached storage (NAS) system — a move that it said gives customers the ability to move data and applications to the cloud without having to use external cloud gateways or pay cloud entrance taxes.

The moves seem to be paying off. Earlier this month Oracle scored a deal with AT&T to move thousands of the telecommunication operator’s internal databases to the Oracle Cloud IaaS and PaaS.