Oracle 比较 VARCHAR2 字段时, 是直接进行比较; 而比较 CHAR 字段时, 则是先补空格,使其长度与字段长度一致, 然后进行比较(Oracle Databasecompares VARCHAR2 values usingnonpadded comparison semantics and compares CHAR values using blank-padded comparison semantics) 4.NCHAR 和 NVARCHAR2 对应于 CHAR 和 VAR...
Changes in This Release for Oracle Database Concepts 1 Introduction to Oracle Database Part I Oracle Relational Data Structures Part II Oracle Data Access Part III Oracle Transaction Management Part IV Oracle Database Storage Structures Part V Oracle Instance Architecture Part VI Oracle Database Admini...
oracle 的 schema 逻辑上存储在 tablespace 里, 但 schema 与 tablespace 之间并无直接关系, 一个 tablespace 可以存储多个 schema, 一个 schema 也可以存储在几个 tablspace 里. 物理实现上,每个 schema object 存储在一个或多个 data file 里. 3. 依赖关系 如果在 schema A 中引用了 schema B, 那么A是B...
Oracle Database Database Concepts, 12c Release 2 (12.2) E85769-04 Copyright © 1993, 2018, Oracle and/or its affiliates. All rights reserved. Primary Authors: Lance Ashdown, Tom Kyte Contributors: Drew Adams, Ashish Agrawal, Troy Anthony, Vikas Arora, Jagan Athraya, David Austin, Thomas...
Database Concepts 首先作为 Oracle 入门学习者来说,《Oracle Database Concepts》 是必读文档,详细的介绍了 Oracle 数据库的基础概念和体系结构,是一本很好的入门读物,建议精读。 在【Administration】下可以看到 【Database Concepts】: 打开之后,可以通过对应的章节查询需要了解的信息,比如我要查看数据库内存结构相关...
Oracle Concepts 中文版 (10g R2) Part I What Is Oracle? 第一部分 何为 Oracle? Chapter 1, Introduction to the Oracle Database 第1 章,Oracle 数据库简介 Part II Oracle Database Architecture 第二部分 Oracle 数据库体系结构 Chapter 2, Data Blocks, Extents, and Segments 第2 章,数据...
Oracle Database Concepts for more information about index-organized tables System Partitioning System partitioning enables application-controlled partitioning without having the database controlling the data placement. The database simply provides the ability to break down a table into partitions without knowi...
Oracle Concepts 中文版 (10g R2) 1 Introduction to the Oracle Database 第 1 章,Oracle 数据库简介 本章对 Oracle 数据库服务器进行概括性的介绍。本章的主题有: Oracle 数据库体系结构 Oracle 数据库特性 Oracle 数据库应用开发 1.1 Oracle 数据库体系结构 An Oracle database is a ...
Oracle ® Database Concepts 12c Release 1 (12.1) Contributor: The Oracle Database 12c documentation is dedicated to Mark Townsend, who was an inspiration to all who worked on this release. This software a... CD Adams,A Agrawal,J Athraya,... 被引量: 7发表: 2013年 Software article: an...
See Also: Oracle Database Concepts for more information about table compression When to Partition a Table Here are some suggestions for when to partition a table: Tables greater than 2 GB should always be considered as candidates for partitioning. Tables containing historical data, in which new ...