> -----Oorspronkelijk bericht----- > Van: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Namens Michiel Meeuwissen > Verzonden: vrijdag 10 februari 2006 13:10 > Aan: Discussion list for developers > Onderwerp: Re: [Developers] Pending issues for MMBase 1.8 > > > André van Toly wrote: > > > - Should the checksum field of images.xml be removed again. > > > > Why? What does it do? > > It was actually kind of a test for datatype features. The > idea is that the 'checksum' field is a checksum value of the > 'handle' field, and that you can mark this field as 'unique'. > That makes it impossible to upload duplicate images. A nice > feature, of course, but only feasible if this can be > accompanied with clear message to users. I don't anticipate > that we would get that working soon in e.g. editwizards. So > perhaps at the moment its value is not worth the trouble. > > > 1.8 is not tested yet in very large environments, which is important > > because of the new caching mechanisms, but i am of the impression > > that it runs fast, contains little overhead of unused modules or > > applications and is a very good and important release! > > I think 1.8 will probably be in certain cases a huge > performance improvement, because of these new caching > mechanisms (though that can be down-side there too, see also > the mail of Ernst). We have also added a change to the > postgresql layer, which can in certain cases drasticly > improve the performance of some queries (by use of the 'only' > keyword).
another powerfull improvement was made by Michiel by changing the way that the bridge obtains lists of relatednodes. in the original implementation all nodes related to a node were fetched, and then the result was filtered on node type. now only one (the right) query is executed. This can lead to significant performance boost when you have nodes with many related nodes. Ernst > > > MIchiel > > > -- > Michiel Meeuwissen mihxil' > Peperbus 111 MediaPark H'sum [] () > +31 (0)35 6772979 nl_NL eo_XX en_US > > > > _______________________________________________ > Developers mailing list > [email protected] > http://lists.mmbase.org/mailman/listinfo/developers > _______________________________________________ Developers mailing list [email protected] http://lists.mmbase.org/mailman/listinfo/developers
