[plt-scheme] disk-based associative array

You may want to make a binding to QDBM. (qdbm.sourceforge.net).
It has nice features and a good licensing scheme. Berkeley DB
is getting more commercial now a days

--Hans


Noel Welsh schreef:
> Someone suggested the Berkeley DB.  gdbm and dbm are
> cut-down versions of the same.  They match your
> requirements but you don't seem to have looked at them. 
> There have been several projects to bind Berkeley DB to
> Scheme (I tried once).  One is here:
>
>   http://wiki.eclab.byu.edu/index.cgi?DbXml
>
> Searching for 'gdbm mzscheme' will yield something.  I
> don't think there are any bindings that are up-to-date
> and/or complete but the interface is fairly simple.  All it
> needs is time, and with lib foreign.ss that amount of time
> is quite small.
>
> N.
>
> --- David Richards <vottamusic at verizon.net> wrote:
>
>   
>>> I've got the same requirements, but haven't found a
>>>       
>> good solution so 
>>     
>>> far. Last time I tried the SLIB database in DrScheme it
>>>       
>> was broken. 
>>     
>>> Moreover, as far as I remember the *disk-based*
>>>       
>> database was an 
>>     
>>> extension for SCM only. SLIBs simple a-list db is
>>>       
>> in-memory.
>>
>> As far as I can understand it SLIB has a disk-based
>> associative array 
>> that allows 256 bytes keys and values.  I need blob
>> values -- and 
>> perhaps even longer keys, depending on the hash function
>> to be used.
>>
>> I'm not about to get into the 'relational' mess in SLIB. 
>> It's way too 
>> complex for my needs.  I'm not even sure it will work.
>>
>> And in response to another reply, yes, essentially the
>> requirements are 
>> the mostly same as a file system.  However I wish to
>> potentially store 
>> tens of millions of variable sized objects.  The 'reiser
>> file system' 
>> looks interesting, but I'm not sure I want to tinker with
>> the file 
>> system at kernel level on my Mac OS X system.
>>
>> I've been taking a look at distributed hash tables, but
>> that doesn't 
>> seem right either for my current needs.
>>
>> I'd love to find a simple C program for a disk-based
>> associative array 
>> that stores fixed length keys and variable length values.
>>  I could port 
>> it to scheme fairly quickly I think.
>>
>>     
>>> It would be nice to have an Mzscheme interface to
>>>       
>> Metakit 
>>     
>>> <http://www.equi4.com/metakit.html>.
>>>       
>> If wishes were code, programmers would sleep.
>>
>> Best regards,
>>
>> Dave
>>     
>
>
> Email: noelwelsh <at> yahoo <dot> com   noel <at> untyped <dot> com
> AIM: noelhwelsh
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