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- However, the gain in relational storage simplicity and schema evolution is offset by reduced query performance, as we will see when we try to create a purchase history report. 但是,关系存储的简单和模式演化的好处会被查询性能的降低所抵消,当我们尝试创建采购历史记录报告时会发现这一点。
- Schema evolution is a key problem in object-oriented systems because the dynamic nature of typical OODB applications calls for frequent changes in the schema. 模式演化是OO系统中一个很关键的问题。由于OODB的应用具有动态特征,因而模式要经常改动。
- Database Schema Evolution and Meta-Modeling 数据库理论
- The space program is the evolution of years of research. 太空计划是多年研究的发展结果。
- Darwin put forth the theory of evolution,. 达尔文提出了进化论。
- Do you know about the evolution of a seed into a plant? 你知道从种子发展成为植物的过程吗?
- Our watchword is: Evolution, not revolution'. 我们的口号是: `要循序渐进,不要剧烈变革.;'
- schema evolution 模式进化
- dynamic schema evolution 动态模式修改, 动态模式演变
- Darwin spend more than twenty year work on his theory of evolution. 达尔文花了二十余年时间研究他的进化论。
- First, independent schema definition is important. 首先独立的格式定义是重要的。
- In politics Britain has preferred evolution to revolution. 在政治上,英国喜欢渐进而不喜欢革命。
- The schema object could not be found. 找不到架构的对象。
- Our political institutions are in continuous evolution. 我们的政治制度正在不断发展中。
- Second, the message schema should be extensible. 其次,消息格式应该可以扩展。
- The attribute schema has bad syntax. 属性架构语法不对。
- This is a clear exposition of the theory of evolution. 这是对进化论的清晰的阐述。
- An attempt is made to modify the base schema. 试图修改基础架构。
- The evolution of heat from the sun is inestimable. 从太阳中放射出的热是无法估计的。
- We studied the evolution of flowers from seeds and buds. 我们研究从种籽和花蕾到花的成长过程。