Clustrix has raised $10 million in Series D financing from HighBar Partners to expand its customer base and accelerate the development of its flagship product, a scale-out SQL database designed for transactional workloads and real-time analytics. The product is used by dozens of “large-scale production customers around the world,” including AOL and Symantec.

The round brings Clustrix’s total funding to $56.5 million. The company had previously raised $16.5 million from Sequoia Capital, U.S. Venture Partners, ATA Ventures and Don Listwin, the founder of the Canary Foundation and the former chief exec of Openwave, a mobile internet pioneer that now calls itself Unwired Planet.

John Kim and Roy Thiele-Sardina, managing partners at HighBar, are joining the Clustrix board along with Mike Hodges of ATA Ventures.

“The need for operational databases that can analyze data in real-time has never been greater with the rapid growth of new hyperscale applications in business segments such as e-commerce, online gaming and advertisement,” said Clustrix CEO Robin Purohit. “The additional funding will allow to aggressively pursue the rapidly growing MySQL/NewSQL market with our proven scale-out database technology.”

Clustrix’s news is only the latest in a string of funding developments in the space.  Last week, the Santa Cruz, CA-based startup Looker received $16 million from Redpoint Ventures and First Round Capital. The startup is best known for LookML, a proprietary language that makes it easier for data scientists to query and update large datasets. Looker is selling the language as part of a browser-based integrated development environment that ships with built-in collaboration and reporting capabilities.

A few days before Looker closed its latest funding round, CloudPhysics announced that it has bagged $10 million in Series B funding from Kleiner Perkins Caufield & Byers and existing investors. The company sells a data-driven IT operations platform for virtualized environments.