[bbk5394] 第95集 -第12章 -数据移植 01

数据泵与原始Imp、exp命令比较

Data pump是一个服务器端的工具;数据泵可以实现暂停功能;

imp、exp是一个客户端的工具;

Oracle Data Pump:Overview

As a server-based facility for high-speed data and metadata movement,Oracle Data Pump:

Is callable via DBMS_DATAPUMP

Provides the following tools

expdp

impdp

Web-based interface

Provides four data movement methods

Data file copying

Direct path

External tables

Network link support

Detaches from and reattaches to long-running jobs

Restarts Data Pump jobs

Oracle Data Pump:Benefits

Data Pump offers many benefits and some new features over earlier data movement tools ,such as:

Fine-grained object and data selection

以前导出时可以按照表、用户等粒度进行导出，现如今可以更加细粒度导出

使用数据泵导出时，可以使用where条件进行更加细粒度的过滤

Explicit specification of database version

导出时，可以指定兼容的数据库版本（11g的数据库中导出兼容10g的数据库的数据

Estimation of exprot job space consumption(expdp功能可以，在真正导出之前，模拟一次导出，从而估算出需要的空间，来保障本地磁盘空间充足，足以满足本次导出操作.)

Network mode in a distributed enviromment

Remapping capabilities

将scott用户下的表，导出后，再倒入到test用户下，可以实现对象之间的映射

Data sampling and metadata compression

Compression of data during a Data Pump export

Security through encryption

Ability to export XML Type data as CLOBs

Legacy mode to support old import and export files