At 10:10 AM 26/09/2001 -0700, Danny Epstein wrote:
> > ... But what if I wrote a conduit for PC only but not for a
> > Mac (or users just doesn't want to install the conduit). So, would
> > there be any problem if we use DmDeleteRecord to delete a record but
> > user rely only on the backup conduit? Would the database header get
> > saturated with deleted record info and not allow any new record to be
> > created? ...
>
>Interesting question. :)
>
>The deleted records take some space, and consume a "record number". Neither
>is likely to be a serious problem in practice, but it really depends on how
>the user works. If he creates and deletes a lot of records (high turn-over),
>he could run out of record numbers. Without a conduit, it'd take a lot of
>Graffiti strokes to do this!
>
>I don't know the exact amount of memory to store a deleted record -- let's
>say it's 8 bytes. So a database "full" of deleted records would consume 64K
>* 8B = 512KB. That's a lot of memory to waste, but it's a small fraction of
>the space available on a typical 8MB device.
>
>You could provide a Purge command to clear out all deleted records. This is
>different than the Purge commands in Datebook and To Do, so it'll require
>explanation. A more automatic solution would be to clear out deleted records
>automatically if you detect that you're running without a conduit. Look at
>it this way: you don't really need to keep deleted records around until
>after the user first HotSyncs with your conduit. Until then, none of the
>records are known outside the device, so it's safe to remove them.
>--
>Danny @ Palm
Thanks for the insight. So what methods can we use to detect if we're
running without a conduit? I suppose we can still use DmRemoveRecord to
permanently delete a "deleted" record (given a correct record index).
John Leung
EMail: [EMAIL PROTECTED]
Web: http://persweb.direct.ca/jleung/
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