Designing DBMS support for the temporal dimension

A graphical query language for simulation databases

“…In [14] concepts are investigated for storing temporal data in an effective way. The current tuples of a relation are stored in a single table.…”

“…A delta version of an object describes the differences between an object version that is not stored completely in the database and the reference object version. The concept proposed in [14] is suitable for temporal databases in which the present data is more relevant than former system states. In a simulation database all system states that are reached during simulation usually have the same relevance.…”

The temporal query language TQuel

“…A variety of work has been done on incorporating time in a database (d., !Anderson 1982, Bradley 1978, Bubenko 1977, Clifford & Warren 1983, Codd 1979, Lum et al 1984, Sernadas 1980. The majority of the researchers focus on issues such as how to model time, how to treat time attributes in a manner consistent with the way humans view time, and how to represent temporal information in an efficient manner.…”

Physical design of temporal databases

“…Recently there has been a significant increase in the amount of research in the area of temporal databases [ARIA84, LUM84,SNOD84,CLIF85,RUBE85,SNOD85,AHN86,SHOSH86,and others]. For a survey or the role or time in information processing, see [BOL082].…”

“…Most of the studies on the support of the temporal dimension have dealt with the conceptual [AHN86, SNOD85, SNOD84, CLIF85] rather than the physical [LUM84,RUBI85,SIJOSH86] level. Like in any other database, it is clear that there is not a single file structure Cor a temporal database that universally dominates all others.…”