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Java Forum / General / November 2006Do you know of java-based, in-memory databases other than HSQLDB and H2?
I need to know of any other active development in this area . Thanks lbrtchx lbrt...@hotmail.com wrote: > I need to know of any other active development in this area > . > Thanks > lbrtchx A quick google of "java memory database" revealse http://www.freeprogrammingresources.com/dbservers.html. which lists a few. Try google for more info. Apache Derby: http://db.apache.org/derby > I need to know of any other active development in this area > . > Thanks > lbrtchx  SignatureIt's not a RootKit - it's a Sony > I need to know of any other active development in this area > . > Thanks > lbrtchx Prevayler http://www.prevayler.org/ > A quick google of "java memory database" revealse > http://www.freeprogrammingresources.com/dbservers.html. > which lists a few. . I wonder what are the few DBs listed as "java memory database", because I had checked this link already and only gave me the ones I know about already. . > Try google for more info. Hmm! Google, ... how interesting! . > http://db.apache.org/derby Does derby suport in-memory mode? Since when? . // __ http://db.apache.org/derby/faq.html#in_memory 4.8. Does Derby have a mode that causes it to run entirely in memory? No, Derby does not support an in-memory mode, but a feature request has been logged in JIRA as DERBY-646. When this FAQ entry was written derby-dev@db.apache.org list activity indicated that some work had been done but that the feature is not actively being worked on. Check that mail list for current status. . lbrtchx when derby is started in its embedded mode, it runs in the same JVM as the program calling it. I belive this is some kind of in memory usage... also there is a small demo on the derby site which shows how to use the DB within a web browser session... ~harry lbrt...@hotmail.com wrote: > > A quick google of "java memory database" revealse > > http://www.freeprogrammingresources.com/dbservers.html. [quoted text clipped - 19 lines] > . > lbrtchx > when derby is started in its embedded mode, it runs in the same JVM as > the program calling it. So? . > I belive this is some kind of in memory > usage... "some kind of in memory usage" will all applications have, but they don't run -totally- in-memory . > also there is a small demo on the derby site which shows how > to use the DB within a web browser session... ? . lbrthcx > I need to know of any other active development in this area Take a look a FirstSQL/J (see my sig); it provides both in-memory and disk mode and is pure Java. SignatureLee Fesperman, FFE Software, Inc. (http://www.firstsql.com) ============================================================== * The Ultimate DBMS is here! * FirstSQL/J Object/Relational DBMS (http://www.firstsql.com) > > I need to know of any other active development in this area > [quoted text clipped - 3 lines] > -- > Lee Fesperman, FFE Software, Inc. (http://www.firstsql.com) . I hadn't seen a site without a search box for a long time ;-) . As we know, we tech monkeys tend to have very little time. Could you send me a link to th documentation on the in-mem usage in firstsql? . The FAQ wasn't helpful. . lbrtchx > As we know, we tech monkeys tend to have very little time. Could you > send me a link to th documentation on the in-mem usage in firstsql? The best online description I could find is at http://www.firstsql.com/fsjbeta2.shtml. Even better, you could take the free download of the product at http://www.firstsql.com/download.shtml and read the regular docs on in-memory support. SignatureLee Fesperman, FFE Software, Inc. (http://www.firstsql.com) ============================================================== * The Ultimate DBMS is here! * FirstSQL/J Object/Relational DBMS (http://www.firstsql.com) based on this very link, FirstSQL/J does not appear to be working -totally- in-memory, as it is needed in a set up that could not even have a hard drive . FirstSQL/J In-memory Mode ... Except for increased performance with In-memory mode, the only difference you will notice is the optional "mode=" startup option and the creation of the log files and persistent .tab and .ndx files in the Server/db directory when starting and stopping the database in memory. . Processing is as follows: ... - Any changes to tables (in memory) are logged in a roll forward journal and written to disk. - With a controlled shutdown, the engine rewrites all changed tables & indexes from memory back to disk in FirstSQL/J file format. ... . FirstSQL/J is the only commercially available 100% Java IMDB and, as the first and most sophisticated 100% Java IMDB on the market, it can be positioned as the leader now and for years to come. . I am planning to do some testing of java DBMSs (in-memory and disk-base ones) and so far I think I will pick H2, HSQLDB, Derby, (very probably FirstSQL/J,) PostgreSQL and Firebird . I hope more DBMS developers would see the benefit of in-mem modes . lbrtchx > based on this very link, FirstSQL/J does not appear to be working > -totally- in-memory, as it is needed in a set up that could not even > have a hard drive That is provided by Flash Mode. The link I gave doesn't provide detail on that mode (I couldn't tell what you were looking for; the regular docs cover it better.) Flash Mode is *totally* in-memory, no disk at all. For example, we've run the ORDBMS in Flash Mode in a unsigned applet (no disk access.) > I hope more DBMS developers would see the benefit of in-mem modes > . The cost of memory continues to drop, and the standard amount of memory on systems continue to rise, even on mobile devices. 64-bit systems are becoming more prevalent. We see in-memory databases as a growth area. And, then there are the significant performance benefits... SignatureLee Fesperman, FFE Software, Inc. (http://www.firstsql.com) ============================================================== * The Ultimate DBMS is here! * FirstSQL/J Object/Relational DBMS (http://www.firstsql.com) Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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