В Пт., 30/12/2011 в 23:10 +0100, Kjell Rilbe пишет: > Den 2011-12-30 21:43 skrev Leyne, Sean såhär: > > Dmitry, > > > >> Trunk is the ongoing development branch (formerly known as HEAD in CVS), > >> i.e. transaction IDs are already unsigned long in FB 3.0. > > Although this would mean a further ODS change as well as an increase in > > overhead associated with all rows, perhaps the ODS size should be increased > > from 4 bytes to 5 bytes to remove any possible likelihood of overflowing > > the max value (=256 transactions per sec, continuously for over 136 years!) > Who knows what will happen within only 5-10 years? Perhaps in five > years, it will be common with systems running a few thousand > transactions per second? In that case 40 bits will only suffice for > about 11 years (3000 trans/sec). > > If such a "big" change is to be made I suggest to make it at least 48 > bits, and why not 64 bits while we're at it?
This will make each version of the record (not the record- but EACH version of it) 4 bytes longer. For table with small records that means severe performance degradation. ------------------------------------------------------------------------------ Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex infrastructure or vast IT resources to deliver seamless, secure access to virtual desktops. With this all-in-one solution, easily deploy virtual desktops for less than the cost of PCs and save 60% on VDI infrastructure costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox Firebird-Devel mailing list, web interface at https://lists.sourceforge.net/lists/listinfo/firebird-devel
