All of your feedbacks are really insightful, I deeply thank you guys, I'm meeting with my boss later with all that stuff to discuss about. Great community and thanks again
2017-04-24 18:58 GMT+02:00 David Raymond <david.raym...@tomtom.com>: > Another situational space/speed helper I found for when you have a > sparsely populated foreign key field is that the child key index can be a > partial index and still work. > > create table child (id primary key, parentID references parent, > stuff);--parentID is nullable > > I had cases where parentID would be populated only about 10% of the time > or less and didn't like knowing I had an index 90% full of nulls. We found > out that a partial index still works: > > create index childOfParentNotNull on child (parentID) where parentID is > not null; > --still used by the foreign key checker, 10% the size, quicker lookups etc. > > > -----Original Message----- > From: sqlite-users [mailto:sqlite-users-boun...@mailinglists.sqlite.org] > On Behalf Of John Found > Sent: Monday, April 24, 2017 12:24 PM > To: sqlite-users@mailinglists.sqlite.org > Subject: Re: [sqlite] Performances and Foreign keys > > Simply make some tests? > > The experiment is the only measure for the truth. > > Personally I am using SQLite for my project AsmBB (web forum software in > assembly language). The project widely uses FK in order to provide DB > consistency. > > It was tested during several "slashdot effect" kind of events and > demonstrated very high performance. > > So, in my experience using foreign keys does not degrade the performance > noticeably. > > Regards. > > > On Mon, 24 Apr 2017 14:31:32 +0200 > Bubu Bubu <sivada...@gmail.com> wrote: > > > Hi everyone, > > > > Foreign keys have been implemented in sqlite since 3.6.19. My boss has > > always been reluctant to use this mechanism in our development under the > > pretext of performance loss. He told me he read that somewhere once, but > he > > can't recall precisely the reasons that lead him think that. > > > > I've read 3.6.19 release note and try to find info that cover that issue > > without finding any. > > > > Can someone tell me if there can really be performance issues when one > uses > > foreign keys in their database? > > > > Thanks a lot > > _______________________________________________ > > sqlite-users mailing list > > sqlite-users@mailinglists.sqlite.org > > http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users > > > -- > http://fresh.flatassembler.net > http://asm32.info > John Found <johnfo...@asm32.info> > _______________________________________________ > sqlite-users mailing list > sqlite-users@mailinglists.sqlite.org > http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users > _______________________________________________ > sqlite-users mailing list > sqlite-users@mailinglists.sqlite.org > http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users > _______________________________________________ sqlite-users mailing list sqlite-users@mailinglists.sqlite.org http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users
