RML(Replay Markup Language)是MS SQL Server产品支持服务团队内部开发使用的一个Trace分析工具,可以帮助数据库管理员管理微软Sql server数据库的性能。最新的版本支持SQL Server 2000和SQL Server 2005和SQL Server 2008。本文介绍了...RML(Replay Markup Language)是MS SQL Server产品支持服务团队内部开发使用的一个Trace分析工具,可以帮助数据库管理员管理微软Sql server数据库的性能。最新的版本支持SQL Server 2000和SQL Server 2005和SQL Server 2008。本文介绍了RML基本用法,压力模拟、性能数据收集与分析。展开更多
For integrating relational databases (RDBs) into semantic web applications, the W3C RDB2RDF Working Group recommended two approaches, Direct Mapping (DM) and R2RML. The DM provides a set of mapping rules according to ...For integrating relational databases (RDBs) into semantic web applications, the W3C RDB2RDF Working Group recommended two approaches, Direct Mapping (DM) and R2RML. The DM provides a set of mapping rules according to RDB schema, while the R2RML allows users to manually define mappings according to existing target ontology. The major problem to use R2RML is the effort for creating R2RML mapping documents manually. This may lead to appearance of many mistakes in the R2RML documents and requires domain experts. In this paper, we propose and implement an approach to generate an R2RML mapping documents automatically from RDB schema. The R2RML mapping reflects the behavior of the DM specification and allows any R2RML parser to generate a set of RDF triples from relational data.The input of generating approach is DBsInfo class that automatically generated from relational schema. An experimental prototype is developed and shows the effectiveness of our approach algorithms.展开更多
文摘RML(Replay Markup Language)是MS SQL Server产品支持服务团队内部开发使用的一个Trace分析工具,可以帮助数据库管理员管理微软Sql server数据库的性能。最新的版本支持SQL Server 2000和SQL Server 2005和SQL Server 2008。本文介绍了RML基本用法,压力模拟、性能数据收集与分析。
基金This work is supported by National Natural Science Foundation of China under grants 61572221, 61173170, 61300222, 61370230, 61433006 and U1401258, Innovation Fund of Huazhong University of Science and Technology under grants 2015TS069 and 2015TS071, Science and Technology Support Program of Hubei Province under grant 2014BCH270 and 2015AAA013, and Science and Technology Program of Guangdong Province under grant 2014B010111007.
文摘For integrating relational databases (RDBs) into semantic web applications, the W3C RDB2RDF Working Group recommended two approaches, Direct Mapping (DM) and R2RML. The DM provides a set of mapping rules according to RDB schema, while the R2RML allows users to manually define mappings according to existing target ontology. The major problem to use R2RML is the effort for creating R2RML mapping documents manually. This may lead to appearance of many mistakes in the R2RML documents and requires domain experts. In this paper, we propose and implement an approach to generate an R2RML mapping documents automatically from RDB schema. The R2RML mapping reflects the behavior of the DM specification and allows any R2RML parser to generate a set of RDF triples from relational data.The input of generating approach is DBsInfo class that automatically generated from relational schema. An experimental prototype is developed and shows the effectiveness of our approach algorithms.