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    <p>I use <a href="https://sdm.lbl.gov/fastbit/" rel="noreferrer">fastbit</a> (Kesheng Wu LBL.GOV), it seems you need something good, fast and NOW, so fastbit is a highly competient improvement on Oracle's BBC (byte aligned bitmap code, berkeleydb). It's easy to setup and very good gernally.</p> <p>However, given more time, you may want to look at a <a href="http://www.imfm.si/preprinti/PDF/01085.pdf" rel="noreferrer">gray code</a> solution, it seems optimal for your purposes.</p> <p>Daniel Lemire has a number of libraries for C/++/Java released on <a href="http://code.google.com/u/lemire/" rel="noreferrer">code.google</a>, I've read over some of his papers and they are quite nice, several advancements on fastbit and alternative approaches for column re-ordering with permutated grey codes's.</p> <p>Almost forgot, I also came across <a href="http://tokyocabinet.sourceforge.net/" rel="noreferrer">Tokyo Cabinet</a>, though I do not think it will be well suited for my current project, I may of considered it more if I had known about it before ;), it has a large degree of interoperability, </p> <blockquote> <p>Tokyo Cabinet is written in the C language, and provided as API of C, Perl, Ruby, Java, and Lua. Tokyo Cabinet is available on platforms which have API conforming to C99 and POSIX.</p> </blockquote> <p>As you referred to CDB, the TC benchmark has a TC mode (TC support's several operational constraint's for varying perf) where it surpassed CDB by 10 times for read performance and 2 times for write. </p> <p>With respect to your delta encoding requirement, I am quite confident in <a href="http://www.daemonology.net/bsdiff/" rel="noreferrer">bsdiff</a> and it's ability to out-perform any file.exe content patching system, it may also have some fundimental interfaces for your general needs.</p> <p>Google's new binary compression application, <a href="http://dev.chromium.org/developers/design-documents/software-updates-courgette" rel="noreferrer">courgette</a> may be worth checking out, in case you missed the press release, 10x smaller diff's than bsdiff in the one test case I have seen published.</p>
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    1. POC Library for compressing sequential positive integers
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    1. COHi RandomNickName42, Thanks for the pointer. Looks like a very promising candidate. For the record, I also found a similar library here: http://code.google.com/p/lemurbitmapindex/ I will give both a try.
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    2. COIt looks like it is patented. http://www.freepatentsonline.com/6831575.html. Could matter.
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    3. COhttps://codeforge.lbl.gov/projects/fastbit/ is a dev-site for fastbit, LGPL, I guess not being BSD or MS-PL may be some issue, but the L in LGPL is some comphert. ;)
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