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2018-01-14 发布于河北
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Structural evolution, mechanical properties, and electronic structure of Al–Mg–Si compounds from first principles.pdf

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Structural evolution, mechanical properties, and electronic structure of Al–Mg–Si compounds from first principles

Memory-Efficient Index for Cache Invalidation Mechanism with OpenJPA Miki Enoki, Yosuke Ozawa, Hiroshi Horii, and Tamiya Onodera IBM Research, Tokyo, Japan {enomiki,ozawaysk,hhorii,tonodera}@ Abstract. OpenJPA is an implementation of the Java Persistence API (JPA) for Apache, with a caching layer for database queries. However the caching performance is poor when an application includes write transactions, because the OpenJPA cache-invalidation mechanism is coarse-grained and this results in a low cache hit rate. In this research, we implemented an index mechanism for cache invalidation optimized for the data access patterns. The sizes of the index can be adjusted for the available cache memory. The results of our benchmark indicated that the optimized index drastically improved the performance of OpenJPA even with a small index size in various data access pattern scenarios. Keywords: EJB3.0, JPA, OpenJPA, Index, Cache invalidation. 1 Introduction The Java Persistence API (JPA) that was defined as a part of the Enterprise JavaBeans (EJB) 3.0 specification standardizes the Object-Relational (O/R) mapping to enhance the capabilities of EJB. There are many JPA implementations with best known being Apache OpenJPA1 2 3 , Hibernate and TopLink Essentials . Each of them has a caching layer for database queries in the application server and this is a critical component for high performance, since the caching layer can reduce the database accesses [2,3,4]. When an application includes write transactions, we have to maintain consistency between the cached data and the database. In Apache OpenJPA v2.0, there is