[Kde-pim] Mix of config and cache data

[Christian Mollekopf]

Hey Martin,

I don't know what exactly happended to you regarding your mail-loss, but it is 
possibly because the config is NOT stored inside the db.

The problem with deleting the db is:
Every File/Folder (or Item/Collection to use tha akonadi jargon), has a unique 
id within the db. If you delete the db, the new db will reuse those ids though 
(but probably not for the same file/folder). Since config options applying to a 
certain folder usually use this id, your config will suddenly apply to a 
different folder after recreating the db.
That is why such config options should be stored in the db IMO.

As I said, I don't know if that is what happened to you, but consider it as a 
possibility (as this would make your conclusion below wrong).

Cheers,
Christian


On Monday 23 April 2012 14.58:37 Martin wrote:
> Am 23.04.2012 14:44, schrieb Kevin Krammer:
> 
> [snip]
> 
> >> I like the idea to use a DB for storing cache data. May be it is a good
> >> idea to store config data in a DB as well, but I an not sure that it is
> >> a good idea to store configuration and cache data in the same DB (IMHO
> >> it is a bad idea).
> > 
> > What is the configuration data that is stored in the DB?
> 
> I don't know. But in the named thread from December last year a
> developer made clear that deleting the akonadi DB is a really bad idea.
> If this DB stores cached data only this should not be any problem. So it
> is my guess that there are config data stored in the DB as well.
> 
> >> I am not sure that I understand the SizeThreshold parameter. Is this the
> >> amount of data (MBytes or data sets) that are stored in the cache DB?
> >> What are the consequences if I set this value to 0 or a even higher
> >> value than the default.
> > 
> > Its unit is bytes, i.e. size of payload parts (which in turn depend on the
> > data type, e.g. a full contact or headers of an email or full email, etc).
> > 
> > All content that is above the threshold is cached in files, all content up
> > to the threshold is cached in the DB.
> 
> OK, thanks for the explanation. Where are the cache files located? Can I
> exclude them from backup/sync?
> 
> Regards
> Martin
> 
> > Cheers,
> > Kevin
> > 
> >> Martin
> >> 
> >>> Please keep in mind that content that is not uploaded to the respective
> >>> storage location yet will be lost if you only backup the DB in such
> >>> cases.
> >>> 
> >>> Cheers,
> >>> Kevin
> >>> 
> >>> P.S.: if $XDG_CONFIG_HOME is not set the specified default is
> >>> $HOME/.config
> 
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