Teradata has agreed to buy RainStor, an online data archiving firm which uses Hadoop software, marking its fourth acquisition of a company specialising in big data within the year.

The deal was completed yesterday for an undisclosed amount.

Teradata, which has over 10,000 workers, said it plans to integrate RainStor’s technologies with its own Hadoop offerings.

"The new archival capability will help customers cost-effectively and efficiently address their data archiving requirements using Hadoop," said Teradata’s president Scott Gnau.

The deal will also see Teradata take ownership of RainStor’s intellectual property, customers, OEM relationships, and the majority of its employees.

"The RainStor team is excited to add our talent and enterprise technologies to Teradata’s portfolio, which will help customers address the challenges of archiving big data," said Anthony Brooks-Williams, VP of RainStor’s Americas Sales and Services.

The deal marks Teradata’s fourth acquisition within the year. The firm bought assets from metadata management startup Revelytix and Hadapt in late July, and snapped up Think Big Analytics in September.