Oracle 索引 详解
一.索引介绍 1.1 索引的创建语法: CREATE UNIUQE | BITMAP INDEX . ON . ( |&n...
Hash Cluster
About Hash ClustersOracle Database uses a hash function to generate a distribution of numeric values, called hash values, that are based on specific cluster key values. The key of a hash cluster, like the key of an index cluster, can be a single column or composite key (multiple column key). To fi...
Indexex Cluster
Overview of Indexed ClustersAn indexed cluster is a table cluster that uses an index to locate data. The cluster index is a B-tree index on the cluster key. A cluster index must be created before any rows can be inserted into clustered tables.CREATE CLUSTER employees_departments_cluster &...
Cluster Table
Overview of Table ClustersA table cluster is a group of tables that share common columns and store related data in the same blocks. When tables are clustered, a single data block can contain rows from multiple tables. For example, a block can store rows from both the employees and departments tabl...
Advanced Compression
Oracle Advanced Compression The Oracle Database 11g Advanced Compression Option introduces a comprehensive set of compression capabilities to help customers maximize resource utilizat...
Compression One
Table Compression The database can use table compression to reduce the amount of storage required for the table. Compression saves disk space, reduces memory use in the database buffer cache, and in some cases speeds query execution. Table compression is transparent to database applications. 数据...
Compression Two
As your database grows in size, consider using table compression. Compression saves disk space, reduces memory use in the database buffer cache, and can significantly speed query execution during reads. Compression has a cost in CPU overhead for data loading and DML. However, this cost might be off...
rowid
Oracle的rowid Oracle中的ROWID是数据的物理...
Oracle10g之传输表空间详解
可传输表空间概述 Oracle 的可传输表空间特性通过将 元数据和数据文件 简单地从一个数据库移动到另一个数据库,提供在数据库之间有效移动大数据的一种简易方法。代替重新创建对象,可移植表空间可以让毫不费力地移动大对象,而所花费的时间是你手动创建这些对象的时间。可移植表空间包括将属于源数据库的...
探索数据字典,提高自学习Oracle能力
我们知道Oracle通过数据字典来管理和展现数据库信息,这些信息至关重要。正确理解这部分内容有助于加强我们的oracle学习能力。接下来我们介绍一下怎样通过数据库本身来学习研究数据库。首先,Oracle的字典表和视图基本上可以分为三个层次。1.X$表这一部分表是Oracle数据库的运行基础,在数据库启动时由Orac...
TNS-01201: Listener cannot find executable
在centos中装完oracle11g后,启动监听报错TNS-01201: Listener cannot find executable。。。。在Pub中搜到解决办法:TNS-01201 Listener cannot find executable string for SID stringCause: The executable for the Oracle dedicated server process cannot be found.Action: Check the appropriate SID_DESC in LI...
EXP/IMP简单使用
一,导出(EXP)1.1给予权限执行imp/exp的用户至少有create session权限,session权限包含在connect角色中直接赋予connect权限给指定用户就行;赋予exp_full_database角色可以导出其它schema的表导入则赋予imp_full_da...
flashback使用
flashback是从oracle9i开始实现的一种恢复功能,完善在10g。10g中利用recyclebin和flashback query功能可以快速的恢复被误删除的table,也可以flashback database 到某个时间点。一,flashback queryflashback qu...
rman恢复的简单命令
restore database;修复数据库restore database delete archivelogs skip tablespace temp;修复数据库的时删除恢复过程中的归档文件,并且跳过表空间恢复表空间usersRMAN> SQL ' alter tablespace users offline';sql...
rman命令的简单介绍
RMAN的简单介绍:rman是oracle自带的备份恢复工具,可以直接运行在dos上。运行rman之前必须先启动加载你要使用的数据库。关于rman的命令backup database; backup database format 'e:/app/rman/backup/full_bak.bak'...
centos6.4下安装oracle11gr2
开始是在虚拟机上学习oracle的,经常切换来却换去感觉使用不是很友好。看见室友用的是archlinux,于是打算自己在机子上装个centos,头一天在室友的帮助下装好了centos,也不是很难,网络上有很多...
外部表的简单介绍
一,简单定义:外部表是在数据库中定义了表结构,真正的数据没有存储在数据库中。二,关于create table 语句create table 有三个选项 heap,index,externalheap是创建普通的堆表,是默认选项index是创建索引表extern...
sqlldr初学
一,sqlldr的参数C:\Users\cj>sqlldrSQL*Loader: Release 11.2.0.1.0 - Production on 星期三 10月 16 10:19:56 2013Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.用法: SQL...
oracle10g官网不提供下载了
oracle10g官网不提供下载了,在网上搜素到了一个下i载地址:http://www.verycd.gdajie.com/topics/57759/。资源人家说停就停,还是收藏下吧!
rpm用法
转载于http://www.cnblogs.com/xiaochaohuashengmi/archive/2011/10/08/2203153.htmlRPM是RedHat Package Manager(RedHat软件包管理工具)类似Windows里面的“添加/删除程序”rpm 执行安装包二进制包(Binary)以...