[Kde-pim] Mix of config and cache data

[Kevin Krammer]

On Monday, 2012-04-23, Martin (KDE) wrote:
> Am 23.04.2012 14:11, schrieb Kevin Krammer:
> > On Monday, 2012-04-23, Martin (KDE) wrote:
> >> Hallo
> >> 
> >> I lost many mails end of last year due to deleting akonadi DB (not
> >> syncing akonadi DB in my migration to a new computer). I had set up some
> >> expiry on some folders which were messed up after this. AFAIK there was
> >> a thread about this topic end of December 2011.
> >> 
> >> My Question: Is this still the case that cache data and configuration
> >> data are mixed in the akonadi DB? Is this going to be changed in new
> >> versions? It is because I don't want to backup caching data and I want
> >> to be able to clean the cache as well.
> > 
> > You can configure the size threshold which is used to determine whether
> > to store cache information in the DB or in files.
> > 
> > See $XDG_CONFIG_HOME/akonadi/akonadiserverrc, variable SizeThreshold
> > 
> > 0 should force out-of-DB cache
> 
> 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 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.

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
> > 
> > 
> > 
> > _______________________________________________
> > KDE PIM mailing list kde-pim at kde.org
> > https://mail.kde.org/mailman/listinfo/kde-pim
> > KDE PIM home page at http://pim.kde.org/
> 
> _______________________________________________
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-- 
Kevin Krammer, KDE developer, xdg-utils developer
KDE user support, developer mentoring
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