Re: Pre-relational, post-relational, 1968 CODASYL "Survey of Data Base Systems"
From: Ken North <knorth2_at_deletethis.yahoo.com>
Date: Thu, 29 Apr 2004 14:55:37 -0700
Message-ID: <c6rth2$ihn$1_at_ngspool-d02.news.aol.com>
Date: Thu, 29 Apr 2004 14:55:37 -0700
Message-ID: <c6rth2$ihn$1_at_ngspool-d02.news.aol.com>
> one of the big arguments that i remember from the pre-relational dbms
> people in stl ... was the physical disk space requirements. The
> earlier databases had physical pointers ... which relational replaced
> with indexes. The indexes tended to double the physical space
> requirements (as well as increasing overhead) vis-a-vis the databases
> with direct physical pointers. The indexes, however, reduced the
> manual maint. involved in maintaining the physical pointers. The issue
> then was somewhat the disk space & processing overhead vis-a-vis the
> manual maint overhead.