当前我国的计算机应用已经深入到社会的各个领域，越来越多的单位建立了以数据库为核心的管理信息系统。关系型数据库系统以其理论基础严格、语言简洁、易学易用、高度非过程化等特点在市场上占据优势。目前流行的大多数数据库系统都是关系型数据库 ...

如果你有排序和连接操作，你可以先select数据到一个临时表中，然后再对临时表进行处理。因为临时表是建立在内存中，所以比建立在磁盘上表操作要快的多。 如： SELECT time_records.*, case_name FROM time_records, OUTER cases WHERE time_records.client = "AA1000" AND time_records.case ...

sysprocplan表是sysmaster库中的一个表，其中记录存储过程经过优化的查询计划。每当查询树中的数据库对象有任何结构上的变化，这个查询计划就会自动更新。如果对查询树中存在的任何表有update statistics操作，也会自动更新查询计划。在查询计划更新的时候，会对 ...

Informix是IBM旗下的一款经典数据库，被蓝色巨人定义为OLTP旗舰数据库集成解决方案。自1980年问世以来，Informix始终以“高性能、高可靠、低维护、低成本”的深厚技术积累，驰骋数据库江湖三十余载，赢得了数据库业界“猎豹”之美誉。 Informix前世今生 谈及 ...

自informix5.x以后,INFORMIX公司推出新一代数据库引擎ONLINE DYNAMIC SERVER动态服务，一般我们简称ONLINE7.X，ONLINE是一个关系数据管理(RDBMS)， 它的任务是提供一个存储、检索、修改和删除数据的环境, 它的目标就是使具有多个物理CPU 和大容量内存的计算机创建高性能和高 ...

Relational database management systems help companies in almost every industry harness and tap into the power of the information they gather, store, manage and analyze for business operations. One of ...

Time series data is a sequence of data points typically measured at successive times and may be spaced at uniform time intervals. Time-stamped data can be analyzed to extract meaningful statistics or ...

Does anyone know how, once terminal'd into a Unix box (I know very little about navigating Unix), I can execute a sql statement against the informix database installed on the system?<BR><BR>SQL Server ...

specifies a dynamic, DBMS-specific SQL statement that does not select data. This argument is required and must be enclosed in parentheses. The statement is case sensitive and is passed to the DBMS ...

IDS 11.5 - the newest version of Informix Dynamic Server - was officially announced by IBM at the International Informix User Conference in Kansas City in April 2008. The announcement created a ...

想查找一个子字符串在字符串中出现的位置，搜了好久没有 ...