If you do not know CACHÉ, here are some further information about the database from InterSystems

InterSystems CACHÉ is a post-relational database that uniquely offers three integrated data access options: a robust object database, high performance SQL, and rich multidimensional access. Caché enables rapid Web application development, extraordinary transaction processing speed, massive scalability, and real-time queries against transactional data - with minimal maintenance requirements. Caché is available for Windows, OpenVMS, Mac OS X, Linux and major UNIX platforms and it is deployed on systems ranging from two to over 50,000 simultaneous users.

Caché is a new generation of ultra high performance database technology known as “post-relational”. As a post-relational database, it combines an object database, high performance SQL, and powerful multidimensional data access – all of which can simultaneously access the same data. Data is only described once in a single integrated data dictionary and is instantly available using all access methods. Caché provides levels of performance, scalability, rapid programming, and ease of use unattainable by relational technology.

But Caché is much more than a pure database technology. Caché includes an Application Server with advanced object programming capabilities, the ability to easily integrate with a wide variety of technologies, and an extremely high-perfor-mance run time environment with unique data caching technology.

Caché also goes beyond traditional databases by incorporating a rich environment for developing sophisticated browser-based (Web) applications. Caché Server Pages (CSP) technology allows the rapid development and execution of dynamically generated web pages. Thousands of simultaneous Web users can access database applications, even on low-cost hardware.
For non-browser based applications, the user interface is typically programmed in one of the popular client user interface technologies, such as VB, Delphi, Java, or C++. Best results (fastest programming, greatest performance, and lowest mainte-nance) are usually obtained by performing all of the rest of the development within Caché. However, Caché also provides extremely high levels of interoperability with other technologies and supports all of the most commonly used development tools, so a wide range of development methodologies are available.

For more details, please visit InterSystems website.

Technical Documentation about Caché and Caché SQL can be found here:

Cachè Online Documentation

Release Notes for maintenance kits prior to Cache 5.0.21

Caché 5.0.21 Release Notes