RainStor
RainStor was a software company that developed a database management system of the same name designed to manage and analyze big data for large enterprises. It uses de-duplication techniques to organize the process of storing large amounts of data for reference. The company's origin traces back to a special project conducted by the United Kingdom's Ministry of Defence with the purpose of storing volumes of data from years of field operations for ongoing analysis and training purposes.

RainStor was headquartered in San Francisco, California, United States with R&D in Gloucester, United Kingdom.
The company was acquired by Teradata in 2014.

History
RainStor was founded in 2002 in the United Kingdom. Originally it was named Clearpace. The company was originally created to exploit technology that was developed by the United Kingdom's Ministry of Defence to store big data under the brand name DeX. The company rebranded DeX as NParchive, which deduplicated and archived rarely used data, in 2008.

The company and product were renamed to RainStor (a portmanteau of relational archiving infrastructure storage) in December 2009, coinciding with a move of the management office from the United Kingdom to San Francisco. The release of version 3.5 of RainStor software, announced in May 2009, coincided with the company's rebranding. RainStor received $7.5 million in venture funding from Storm Ventures, Doughty Hanson Technology Ventures, Informatica, and The Dow Company in March 2010. 
In 2011, it received some marketing awards.
In October 2012, RainStor received $12 million in venture funding from Credit Suisse, Doughty Hanson Technology Ventures, Storm Ventures, the Dow Chemical Company, and Rogers Venture Partners.

In October 2012, the company reported over 100 clients. RainStor worked with companies in the telecommunications and finance industries, as well as with government agencies.

Teradata acquired RainStor in December 2014.
Teradata dropped the RainStor product from its portfolio in January 2016 and it is no longer developed or marketed.

Product
RainStor provided software for query and analysis against large volumes of machine generated data and an online data archive for regulatory compliance data retention.

In October 2012, RainStor held two patents and was pursuing five additional patents.
The database uses a row/columnar hybrid repository. The archived data is accessed using Structured Query Language (SQL). RainStor software uses partition filtering, which excludes certain records from processing.

RainStor runs on Apache Hadoop. In June 2013, RainStor released version 5.5 of its software. The release added user authentication protocols, access controls and policies, data encryption and user activity logs.

In May 2014, the company announced protection for data from manipulation, malicious attacks, breaches, or deletion.

In December 2016, Teradata has removed Rainstor from its portfolio and it is no longer being developed or marketed.

References

Software companies established in 2004
Software companies of the United States
Companies based in San Francisco
Teradata