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Steve Graves' Blog Posts

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Is it an in-memory database system, or not?

When you hatch a database management system, it will, by design and implementation, be either an in-memory database system or an on-disk database management system. The choice affects the fundamental optimization strategies that will be baked into the database system code. To optimize an on-disk database is to minimize disk I/O, so its design will use extra CPU cycles and extra memory if doing so will reduce or eliminate I/O. Conversely, IMDSs by definition eliminate all disk I/O; their optimization is all about delivering the highest performance at a given level of processing power, thus reducing demand for CPU cycles is a key objective. And since memory is storage for an IMDS, reducing memory overhead (i.e. RAM consumed for anything other than storing data) is also a key objective.

A hybrid database

eXtremeDB enables the developer to combine in-memory and on-disk paradigms in a single database system. Specifying that data will be stored in memory (transient), or on disk (persistent), requires a simple database schema declaration. The resulting system retains in-memory strengths (speed, footprint, etc.), yet leverages the potential cost savings and durability of an on-disk database.

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Mumbai-based 63 Moons, a global leader in offering technology and domain expertise in creating next-generation market solutions, has adopted the eXtremeDB IMDS in its real-time financial software. 63 Moons deployed eXtremeDB in its Microsoft Windows Server-based DOME (Distributed Order Management Engine) trading platform and in other products.

“eXtremeDB replaces the relational database management system (RDBMS) that previously supported middle-tier functions in existing products….A growing volume of data at this level of the system is what prompted our company to seek a database solution that offers greater efficiency than traditional RDBMS software, which has been a staple of financial markets for several decades.” – 63 Moons

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BAE Systems integrates the eXtremeDB in-memory database for avionics in the Panavia Tornado GR4 combat jet. Within the aircraft’s Tornado Advanced Radar/Map Display Information System (TARDIS), eXtremeDB manages tactical information and is updated in real-time from multiple sources. The company chose eXtremeDB rather than developing its own database in order to reduce costs and shorten time-to-market.

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