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Neil Schemenauer wrote:
>>  While you are packing a database, access to objects are blocked.
> Not true in version 3.

Glad to read that.

> However, other applications may have reference cycles within
> the persistent set of objects.

I agree.

>>  - BerkeleyDB is not affected by write ratio.
>
> I find that hard to believe.  In any case, Durus client will be
> affected by a high write rate.  If the write rate is high enough
> then it's probably more efficient to have a database that can
> locking.

The problem is not write rate but to write to the same objects. That is,
conflicts. In my project I would have a lot of writes, but fairly spreaded.

> Sounds like a fun project.  You might also look into
> DirectoryStorage as an alternative to BerkeleyDB.

You are talking about DirectoryStorage for ZODB, I suppose. I know it.
If you use a "decent" filesystem (reiserfs, for example) the
multimillion object count is not a problem. I am wondering about the
garbage strategy they use. Any idea?.

Update: I just read the FileStorage code. It use mark & sweep.

> Durus was
> designed to be simple and we sacrificed on scalability to achieve
> that.

Durus simplicity is the factor because I choose it instead of the
overkill ZODB.

I admit that current DURUS solve a lot of issues, like the index or the
online packing. Still, packing requires double space and memory use is
high (if you have a lot of objects). Silly inconvenients, I admit.

Maybe BerkeleyDB is overkill for Durus: for small databases, current
Durus runs fine, and for big ones Durus design probably doesn't scale.

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