实现方法是创建一个压缩的符号字典，取代行级重复数据模式。
It does this by creating a compression dictionary of symbols which replace repeating data patterns at the row level.
具体来说，数据交换工具将给定的源数据模式，依据标准的数据模式（数据字典），转换为本地目标数据模式。
Specifically speaking, a given source data pattern can be converted to a local target data pattern according to the standard data pattern (the data dictionary) by the data exchange tool.
针对传统信息模型中，数据字典的构建模式无法接纳新资源信息的加入，扩展性较差的不足，提出了一种可扩展的数据字典体系的结构设计方法。
One of the limitation for traditional data-dictionary design pattern in information systems is short of expansibility, and it is unadapted for the appearance of new information resources.
查询系统读取不同数据源的数据字典，通过模式管理器建立起集成模式。
Through the schema manager, the query system creates an integrated schema after reading the data dictionaries of the various data sources.
IDMS用数据字典控制系统产品的存取，用子模式控制数据的存取，使数据库不被非法用户使用。
Under IDMS, the access to system products is controled by means of a data dictionary, and data access is controled by subscheme, so as to protect IDMS data base accessed from unauthorized users.
IDMS用数据字典控制系统产品的存取，用子模式控制数据的存取，使数据库不被非法用户使用。
Under IDMS, the access to system products is controled by means of a data dictionary, and data access is controled by subscheme, so as to protect IDMS data base accessed from unauthorized users.
应用推荐