database types

[Ken Murchison]

Aidan Evans wrote:
> 
> On Sun, 13 Oct 2002 at 11:05 Rob Siemborski wrote to David Wright and...
> 
> >On Sat, 12 Oct 2002, David Wright wrote:
> >
> >> Can someone explain what advantages and disadvantages one has from the
> >> different database types? And what is a skiplist anyway? I'm familiar
> >> with flat files and the sleepycat databases, but I've never heard of a
> >> skiplist.
> >
> >This has been addressed on the list several times, here's the summary:
> >
> >http://asg.web.cmu.edu/archive/message.php?mailbox=archive.cyrus-sasl&msg=2311
> 
>   This says
> 
>         >    --with-duplicate-db=DB  use DB (db3, skiplist) as a backend
>         > for the duplicate delivery db (Default: db3_nosync
>         )
> 
>         db3_nosync, since the worst part about losing this is that someone
>         might get a vacation message twice.  It also needs fast lookups.
> 
> which does not sound right, if "losing this" refers to the database.  What
> seems to happen in our environment is that all sieving stops working.  I
> have not tested everything, but right now deliver.db (db3-nosync) is broken
> and my sieve script which has a couple of "if" tests, a "redirect", and a
> "fileinto" now does nothing.

If the duplicate deliver database can't be initialized, then Sieve is
turned off (to prevent mail loops, etc).  The same _used_ to be true if
duplicate suppression was turned off, but now Sieve and duplicate
suppression are independent of one another (but they both depend on
deliver.db being available).

-- 
Kenneth Murchison     Oceana Matrix Ltd.
Software Engineer     21 Princeton Place
716-662-8973 x26      Orchard Park, NY 14127
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