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POMain Memory DB vs Object DB
 

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    <p>I'm currently trying to pick a database vendor.</p> <p>I'm just seeking some personal opinions from fellow database developers out there.</p> <p>My question is especially targeted towards people who:</p> <p>1) have used Main Memory DB (MMDB) that supports replicating to disk (hybrid) before (i.e. <a href="http://www.mcobject.com/standardedition.shtml" rel="nofollow noreferrer">ExtremeDB</a>) </p> <p>or </p> <p>2) have used <a href="http://www.versant.com/en_US/products/objectdatabase" rel="nofollow noreferrer">Versant Object Database</a> and/or <a href="http://www.objectivity.com/pages/objectivity/technical-information.asp" rel="nofollow noreferrer">Objectivity Database</a> and/or <a href="http://www.progress.com/objectstore/index.ssp" rel="nofollow noreferrer">Progress ObjectStore</a></p> <p>and the question is really: if you could recommend a database vendor, based on your experience, that would suit my application.</p> <p>My application is a commercial real-time (read: high-performance) object-oriented C++ GIS kind of app, where we need to do a lot of lat/lon search (i.e. given an area, find all matching targets within the area...R-Tree index). </p> <p>The types of data that I would like to store into the database are all modeled as objects and they make use of std::list and std::vector, so naturally, Object Database seems to make sense. I have read through enough articles to convince myself that a traditional RDBMS probably isnt what I'm really looking for in terms of</p> <ol> <li>performance (joins or multiple tables for dynamic-length data like list/vector) </li> <li>ease of programming (impedance mismatch)</li> </ol> <p>However, in terms of performance, </p> <ol> <li><p>Input data is being fed into the system at about 40 MB/s. </p></li> <li><p>Hence, the system will also be doing insert into the database at the rate of roughly 350 inserts per second (where each object varies from 64KB to 128KB),</p></li> <li>Database will consistently be searched and updated via multiple threads. </li> </ol> <p>From my understanding, all of the Object DBs I have listed here use cache for storing database objects. ExtremeDB claims that since it's designed especially for memory, it can avoid overhead of caching logic, etc. See more by googling: Main Memory vs. RAM-Disk Databases: A Linux-based Benchmark</p> <p>So..I'm just a bit confused. Can Object DBs be used in real-time system? Is it as "fast" as MMDB?</p>
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