[Digikam-users] Any thoughts on RAM needs?

[sleepless]

Thanks to the lord I had the patience to wait for an answer, and thanks 
to Jean-Francois for the reply. I could not have hoped for a better one.

To be continued.

Have a nice day,
Rinus

Op 13-09-11 14:10, Jean-Francois schreef:
>
> On Tue, 13 Sep 2011, Rinus Bakker wrote:
>
>> I was suspicious about the db being broken and was hoping for that 
>> (it can
>> be fixed) and was fearing that (it cause an awfull lot of work)
>> Putting the answers of Gilles and Remco together makes me even more
>> suspicious about that scenario.
>>
>> That´s why I came with this question a while ago:
>> I suppose that the db becomes more and more messy by adding, removing 
>> and
>> readding etc etc, I wonder if someone knows if and if, how it is 
>> possible to
>> optimize the db in order to have quicker search capabillity.
>> A few filtering actions can make it quite unresponsive.
>
> Good guess. All databases systems, be it SQLite, MySQL, Oracle, 
> PostgreSQL, etc., get messy and fragmented as time goes by.
> And that's why all database software provide a "vacuum" function, to do
> cleanup tasks, reorganize tables and indexes, remove deleted tuples, etc.
>
> It's a good practice to do such cleanup from time to time.
> (Time to time may be every night for huge professional databases, or
> once or twice a month for a user level database as digiKam DB.)
>
>> and with this question:
>> Does anyone know if this
>> cleanup_digikamdb.1 by Andy Clemens
>> is still valid to use with current digikam db?
>>
>> And any ideas what to do with that cleanup_digikamdb.1 file?
>
> Cleanup_digikam doesn't nothing else than issuing "vacuum" commands.
> The extra is that it checks that no active DB connection is running,
> because it's not possible to do vacuum tasks while an application is
> connected and working with the database.
>
> But you don't need cleanup_digikam if you have the SQLlite3 package
> installed, just use the sqlite3 command line client program.
>
> - Close any running digiKam program
> - Go into your digiKam base directory and backup your digikam4.db file.
> - From command line run the following :
>   sqlite3 -line digikam4.db 'vacuum;'
>
> That's all and that's mostly what cleanup_digikam does.
>
> You can also run some checks, e.g. :
>   sqlite3 -line digikam4.db 'pragma integrity_check;'
>
> and, hopefully, get a message :
>   integrity_check = ok
>
> Tuning a database performance is a bit more complicated because you need
> to know what kind of performance parameter may be affected.
> SQLite3 has a number of tuning parameters, see the documentation :
>  http://www.sqlite.org/pragma.html
>
> Maybe, moving temporary storage from disk to computer memory may help
> about performance :
>   sqlite3 -line digikam4.db 'pragma temp_store = 2;'
> (That's the only "tuning" I did on my digikam DB)
>
> Note that doing such DB maintenance tasks with the SQLite3 command line
> program is independant of such or such digiKam version. It's *the* 
> program
> packaged with *the* sqlite library used by digiKam. So it knowns 
> perfectly
> well what should a SQLite db look like, what is correct or not.
> If integrity checks are ok, you can trust that.
>
> Cheers,
>
> Jean-François
>
>
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