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Overview of the Research
Transformation From Query to Performance Measure
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allows the modeler attribute and value attribute-value pairs Boolean expressions characterize CODASYL data base workload Data Manipulation Language data model records data submodel DBMS described developed documents ELM-OF evaluation example FIND NEXT RECORD FORTRAN given attribute hardware hierarchical information structure information system IPSS model IPSS/REL logical data base logical record mation methodological model number of occurrences number of records o o o o o o object occurrence PDF oo oooo oo ooo oo oooooooooo PDF's procedure Propositional Calculus query language query statistics query transformation random variable record that satisfies record types records that contain relational algebra relational calculus relational data model relational extensions renewal processes represented retrieval efficiency satisfied query search key secondary storage simulation specified stochastic process system loading system performance system's data base total number tuple UJ UJ Underlying Methodologies user queries user requests user workload value-l