Amazon’s emergence as a major provider of data center technology has turned many of its longtime suppliers, including Oracle, into heated rivals.

Now Amazon is dealing yet another blow to Oracle. The e-commerce giant, having already moved much of its infrastructure internally to Amazon Web Services, plans to be completely off Oracle’s proprietary database software by the first quarter of 2020, according to people familiar with the matter.

The shift is another sign of Amazon’s rapid ascent in enterprise computing and further shows how much Oracle is struggling to keep pace as businesses move workloads to the cloud and away from traditional data centers.

CNBC

This is going to be a huge hit for Oracle Amazon is a very large customer.