linas, ty for this precise info! it helps me too Am Dienstag, 9. Mai 2017 22:53:05 UTC+2 schrieb linas: > > The preliminary port to neo4j indicated it was 10x slower than postgres. I > don't know the technical reason for this, it might just be due to a bad > design. Perhaps a good coder could fix this up. > > Other nosql databases tend to be optimized for caching web pages or > images, which are 10KBytes or larger (megabytes), and have absolutely > terrible performance when the stored objects are just a few hundred bytes. > The opencog atoms are, for the most part, about 50-100 bytes in size, when > stored. > > postgres has sophisticated query mechanisms which most nosql databases do > not support. Opencog uses one of these, to quickly locate atoms at the end > of graph edges. > > So these two requirements: ability to walk graph edges, and to be > efficient/fast for small objects, are currently the main requirements. > MariaDB can't do the first, and most nosql cant do the second. > > --linas > > > On Mon, May 8, 2017 at 4:19 PM, Dmitry Ponyatov <[email protected] > <javascript:>> wrote: > >> I see odbc-postgresql & postgresql-client @ >> https://github.com/opencog/ocpkg/blob/master/debian/install-debian-dependencies.sh >> >> I'm surprised why pgsql used ? >> opencog nature tends to use some noSQL graph databases like neo4j >> >> -- >> You received this message because you are subscribed to the Google Groups >> "opencog" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected] <javascript:>. >> To post to this group, send email to [email protected] >> <javascript:>. >> Visit this group at https://groups.google.com/group/opencog. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/opencog/9fa7463c-756c-4639-a16f-ebe71abd3086%40googlegroups.com >> >> <https://groups.google.com/d/msgid/opencog/9fa7463c-756c-4639-a16f-ebe71abd3086%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> For more options, visit https://groups.google.com/d/optout. >> > >
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