You were right! After the pull everything works! It works so well that it 
has kept the backwards-compat layer and it works even without the 
exclamation mark haha

Regarding RockDB, I tried to install it but now I don't remember at what 
point I stopped and why .. but I definitely had space problems. Too bad 
because it inspired me a lot as storage, anyway 50% slower is really a lot!
However (unfortunately) I have skills with postgresql so for now I am 
satisfied, since everything works.
  
Thanks a lot for the answer! Good work!

Michele Thiella
Il giorno mercoledì 10 marzo 2021 alle 23:35:42 UTC+1 linas ha scritto:

> Hi Michele,
>
> Just around the same time that you sent this message (or a day before?) I 
> spotted and fixed a problem with atom deletion. So, please try rebuilding 
> and reinstalling the atomspace.  (git pull; cd build; make -j; sudo make 
> install) -- let me know if that solves the problem.
>
> Note also, the proper name is cog-delete!  (with an exclamation mark at 
> the end) I may have removed the backwards-compat layer that allowed it to 
> work without the exclamation mark..
>
> Note also: there is a RocksDB backend too. It might be easier to use (no 
> config required). In some synthetic benchmarks, its 2x or 3x faster than 
> postgres. In the one "real-life" app that I'm using, its 10%-50% slower. Go 
> figure.  Anyway its at https://github.com/opencog/atomspace-rocks
>
> (There is also a network server backend: 
> https://github.com/opencog/atomspace-cog ... the README explains more)
>
> -- Linas
>
> On Mon, Mar 8, 2021 at 3:58 AM Michele Thiella <[email protected]> 
> wrote:
>
>> Goodmorning everyone,
>> i have a simple problem about deleting atoms in postgresql.
>> According to what I understand, to delete an atom saved in postgres I 
>> should use:
>> (cog-delete (Concept "asdf"))
>> The command is successful, the atom is removed from the atomspace but not 
>> from the postgresql database. Could someone kindly tell me why?
>> The prostgresql backend should be configured correctly, according to the 
>> guide on the wiki ... saving new atoms in the database works. 
>> Thanks in advance, I apologize for the inconvenience
>>
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>
>
> -- 
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>
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