Ever thought of having your database residing on your main memory?
Just think how fast your application can be or what you can do with a complete database system in main memory. How it can relieve you of writing complex data structures and operations on them in your application.
In-Memory Database (IMDB) is, as you have rightly guessed, is a database that resides on your main memory and vanishes as soon as your application stops or device is powered off. Of course you can store it on secondary disk for permanent storage as well.
There are many proprietary as well as open source IMDBs available.
eg Oracle's TimesTen, FastDB, eXtremeDB, sqlite3 etc.
For more info google for IMDB.
Enjoy....
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