场景3 Data Management 数据管理 性能优化 OLTP OLAP 物化视图 :表的快照 传输表空间 :异构平台的数据迁移 星型转换 :事实表 OLTP : 在线事务处理 1. transaction —> DML 2. 数据量小 3. 处理时间短 —> SQL 共享,绑定变量 4. 并发量大 OLAP,DSS 1. 以查询为主(海量)—> 数据汇总 —> 结果放到表(物化视图)里 2. 处理时间长 3. 几乎无并发 4. 做并行处理 SGA + PGA memory_…

场景4 Data Warehouse Management 数据仓库 parallel 4 100% —> 必须获得指定的4个并行度,如果获得的进程个数小于设置的并行度个数,则操作失败 parallel_min_percent : 若设为100,则如上 ILM :信息生命周期管理 将休眠的数据高压缩放在低成本通道上(如磁带机) 将低访问量的数据低压缩放在访问效率低的设备上 将高访问数据不作压缩放在访问效率高的设备上 分区 (官方文档VLDB and Partioning Guide) 单张表容量…

场景7  Data Guard 官方文档 :Oracle Data Guard Concepts and Administration 用于数据容灾,通过主备库同步(主库将redo日志传送到备库,一个主库可对应多个备库(30)),实现异地容灾 1. 构建测试库 2. 构建读写分离的环境 3. 实现滚动升级 4. 数据备份 数据容灾 : 1. 基于存储复制 2. 基于逻辑卷复制(镜像) 3. 基于应用(redo log) redo log : DML/DDL, 记录数据块变化,用于recovery…

场景5 Performance Management 性能调优(不能重启数据库) 索引 资源管理器 性能优化 统计分析 SQL性能分析 SPM (SQL执行计划管理) 堆表 :数据存储无序 位图索引 :适合字段重复值高的,数据仓库环境下(适合OLAP/DSS环境),存储占用空间少, DML成本高, WHERE中与或操作效率高 eg : select count(*) from customers where m_status = married and region in (‘central’,…

原文地址:http://www.javacodegeeks.com/2015/07/mysql-vs-mongodb.html 1. Introduction It would be fair to say that as IT professionals we are living in the golden age of data management era. As our software systems become more complex and more distributed,…

http://www.windowsazure.com/en-us/develop/net/fundamentals/cloud-storage/ Managing and analyzing data in the cloud is just as important as it is anywhere else. To let you do this, Windows Azure provides a range of technologies for working with relati…

1.Database concepts (1)Data & Information Information Is any kind of event that affects the state of a dynamic system Is the message (utterance or expression) being conveyed Is an ordered sequence of symbols that can be interpreted as a message As se…

Data Management ObjectivesBy the end o this module, you should understand the fundamentals of data management, including:1.Explain typical data management operations.2.Describe typical user cases for inserting system fields.3.List the ways to obtain…

ev401-018:Data Management: Data management ToolsModule Objectives1.List objects exposed in the import wizards.2.List some objects not exposed in the import wizards.3.List some capabilities of API-based tools that the import wizards do not have.4.Stat…

Dev401-017:Data Management: Introduction to Upsert Module Objectives1.Define upsert.2.Define external ID.3.List typical use case where upsert is useful.4.List typical use case where upsert with relationships is useful.5.Explain how external IDs are u…