IBM announced on Friday that it has acquired Compose, the Y Combinator-backed database-as-a-service (DBaaS) startup originally known as MongoHQ. Financial terms of the acquisition were not disclosed.

Compose had raised $6.4 million since it launched in 2010 - most of it in a Series A round in 2012 that was led by Trinity Ventures.

The IBM and Compose deal was made a year and a half after IBM bought Cloudant, a startup that played in the same database-as-a-service market but supported a database based on open-source CouchDB.

Compose, by contrast, supports other databases: MongoDB, Redis, Elasticsearch, RethinkDB, and PostgreSQL. It can run these databases on the cloud of customers' choosing, including Amazon Web Services, DigitalOcean, and IBM's SoftLayer. IBM has no plans to discontinue Compose's support for clouds other than SoftLayer, a spokesman said.

An IBM spokesperson told Tech Crunch that Compose, which has offices in San Mateo, Calif., and Birmingham, Ala., will continue to operate as usual after the acquisition closes and that current users will not be impacted by this change.

Compose said about 3,600 companies currently use its services and that its users, which span industries from retail to IoT and marketing services, have spun up over 100,000 databases so far.

"By joining IBM, we will have an opportunity to accelerate the development of our database platform and offer even more services and support to developer teams," said Kurt Mackey, co-founder and CEO of Compose, in a press release this morning.

"As developers, we know how hard it can be to manage databases at scale, which is exactly why we built Compose -to take that burden off of our customers and allow them to get back to the engineering they love."

IBM argues that this acquisition will give it access to an "enhanced framework to deliver highly sought after, production ready, cloud database services for developers."

"Compose's breadth of database offerings will expand IBM's Bluemix platform for the many app developers seeking production-ready databases built on open source," said Derek Schoettle, the general manager of IBM Cloud Data Services, in today's announcement.

"Compose furthers IBM's commitment to ensuring developers have access to the right tools for the job by offering the broadest set of database-as-a-service service and the flexibility of hybrid cloud deployment." Schoettle added.