ER has also been proposed as a logical level model in three studies and the eight remaining studies have proposed independent solutions such as Constellation, Generic Logical Model (GLM), RDF, HGrid, NoSQL Collectional Data Model (NCDM), Open Scalable Relational Data Mode (OSRDM) and Key-cube. In addition, five studies do not propose any model at this level.
The data obtained in this section will be compared with the data from the following one, which determines the most studied data stores’ implementations from the selected relevant articles.
Data Model at Physical Level
At this level, the physical implementations of the models in a specific DBMS are determined. According to the results obtained in Figure 13, the trend is towards the implementation in MongoDB with 13 proposals, followed by Neo4j with seven studies and, finally, Cassandra with six studies. These data match with the data presented in Figure 12, where the trend at the logical level is towards document-oriented, column-oriented and graph-oriented models.
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