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We present a multi-process application called HISTEX (HISTory EXerciser),which executes input histories in a generic transactional notation oncommercial DBMS platforms. HISTEX could be used to discover potential errors inthe implementation of Isolation Levels by Relational Database ManagementSystems or cases where a system behaves over restrictively. It can also be usedfor performance measurements related to database workloads executing on realdatabase systems instead of simulated environments. HISTEX has been implementedin C by utilizing Embedded SQL. However, many of its ideas could bereincarnated in new implementations that could rely on other databaseconnectivity paradigms such as JDBC, JPA etc. We expect that by presenting someof the ideas behind its development we could re-invigorate some fresh interestand involvement in the research community regarding such tools.

HISTEX (HISTory EXerciser) : A tool for testing the implementation of Isolation Levels of Relational Database Management Systems