search
HomeDatabaseMysql Tutorial oracle下逻辑的导入导出工具exp/imp

oracle下逻辑的导入导出工具exp/impexp/imp简介:exp/imp是oracle幸存的最古老的两个命令行备份工具,在小型数据库的转储、表空间的迁移、表的抽

oracle下逻辑的导入导出工具exp/imp

exp/imp简介:

        exp/imp是oracle幸存的最古老的两个命令行备份工具 ,在小型数据库的转储、表空间的迁移、表的抽取、检测逻辑和物理冲突中使用非常广泛,我们可以把它作为小型数据库的物理备份后的一个逻辑备份。它可以跨平台、跨版本。

exp/imp的工作原理:

        exp用户进程通过服务器进程连接到数据库,开启shadow进程,同时执行select语句查询数据库中的数据,通过buffer cache并通过SQL语句处理层再转移出exp导出文件,即exp进程需要占用服务器上的SGA和PGA资源。

        imp读取exp导出的.dmp文件,虚拟主机,构造DDL语句,插入创建表与其他对象以及添加数据的语句

exp的导出数据的方式:

        1、全库导出(这种方式一般不用)

        2、按用户导出

        3、按表导出

exp常用参数简介:exp help=y

3、按表导出

    

 oracle下逻辑的导入导出工具exp/imp

4、在导出是,只导出表结构不导出数据

    

 oracle下逻辑的导入导出工具exp/imp

exp工具的缺点:

        速度慢,由于exp连接到数据库需要先select要导出的数据,再通过SGA、PGA传输给exp。

        如果此连接断开,网站空间,则exp需从头开始导出,没有断点续传的功能

        消耗服务端资源,只能服务端业务的前提下使用

imp 常用参数:imp help=y

 oracle下逻辑的导入导出工具exp/imp

    

导入数据,将导出的数据导入到windows平台的oracle 11g 64位中

        使用11g客户段导入数据

1、按用户导入

      imp   system/oracle@orcl     fromuser=lck     touser=lck    file=d:\lck_tables.dmp;      

    再导入

 oracle下逻辑的导入导出工具exp/imp

  又报错了,对data表空间没权限,因为没有给lck用户分配在data表空间上的配额,香港空间,其实现在表结构已经导进来了,看一下

    

 oracle下逻辑的导入导出工具exp/imp

      好吧,那就再给lck的配额,再导入      

 oracle下逻辑的导入导出工具exp/imp

 啊,还是报错,对象已存在,加参数ignore=y (忽略创建错误),再导入

 oracle下逻辑的导入导出工具exp/imp

  ok,导入成功,  原来导入数据不是一帆风顺的啊。

    总结:导入数据前需要在目标数据库中创建对应的用户,并给用户相应的权限和该用户在自己默认表空间上的配额

2、按表导入

    exp system/oracle@orcl  talbes=tab1  fromuser=lck,test  touser=lck,test file=d:\lck_test_tables.dmp  

 oracle下逻辑的导入导出工具exp/imp

ok,导入成功!!

本文出自 “挨踢小蝌蚪” 博客,请务必保留此出处

Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Explain the role of InnoDB redo logs and undo logs.Explain the role of InnoDB redo logs and undo logs.Apr 15, 2025 am 12:16 AM

InnoDB uses redologs and undologs to ensure data consistency and reliability. 1.redologs record data page modification to ensure crash recovery and transaction persistence. 2.undologs records the original data value and supports transaction rollback and MVCC.

What are the key metrics to look for in an EXPLAIN output (type, key, rows, Extra)?What are the key metrics to look for in an EXPLAIN output (type, key, rows, Extra)?Apr 15, 2025 am 12:15 AM

Key metrics for EXPLAIN commands include type, key, rows, and Extra. 1) The type reflects the access type of the query. The higher the value, the higher the efficiency, such as const is better than ALL. 2) The key displays the index used, and NULL indicates no index. 3) rows estimates the number of scanned rows, affecting query performance. 4) Extra provides additional information, such as Usingfilesort prompts that it needs to be optimized.

What is the Using temporary status in EXPLAIN and how to avoid it?What is the Using temporary status in EXPLAIN and how to avoid it?Apr 15, 2025 am 12:14 AM

Usingtemporary indicates that the need to create temporary tables in MySQL queries, which are commonly found in ORDERBY using DISTINCT, GROUPBY, or non-indexed columns. You can avoid the occurrence of indexes and rewrite queries and improve query performance. Specifically, when Usingtemporary appears in EXPLAIN output, it means that MySQL needs to create temporary tables to handle queries. This usually occurs when: 1) deduplication or grouping when using DISTINCT or GROUPBY; 2) sort when ORDERBY contains non-index columns; 3) use complex subquery or join operations. Optimization methods include: 1) ORDERBY and GROUPB

Describe the different SQL transaction isolation levels (Read Uncommitted, Read Committed, Repeatable Read, Serializable) and their implications in MySQL/InnoDB.Describe the different SQL transaction isolation levels (Read Uncommitted, Read Committed, Repeatable Read, Serializable) and their implications in MySQL/InnoDB.Apr 15, 2025 am 12:11 AM

MySQL/InnoDB supports four transaction isolation levels: ReadUncommitted, ReadCommitted, RepeatableRead and Serializable. 1.ReadUncommitted allows reading of uncommitted data, which may cause dirty reading. 2. ReadCommitted avoids dirty reading, but non-repeatable reading may occur. 3.RepeatableRead is the default level, avoiding dirty reading and non-repeatable reading, but phantom reading may occur. 4. Serializable avoids all concurrency problems but reduces concurrency. Choosing the appropriate isolation level requires balancing data consistency and performance requirements.

MySQL vs. Other Databases: Comparing the OptionsMySQL vs. Other Databases: Comparing the OptionsApr 15, 2025 am 12:08 AM

MySQL is suitable for web applications and content management systems and is popular for its open source, high performance and ease of use. 1) Compared with PostgreSQL, MySQL performs better in simple queries and high concurrent read operations. 2) Compared with Oracle, MySQL is more popular among small and medium-sized enterprises because of its open source and low cost. 3) Compared with Microsoft SQL Server, MySQL is more suitable for cross-platform applications. 4) Unlike MongoDB, MySQL is more suitable for structured data and transaction processing.

How does MySQL index cardinality affect query performance?How does MySQL index cardinality affect query performance?Apr 14, 2025 am 12:18 AM

MySQL index cardinality has a significant impact on query performance: 1. High cardinality index can more effectively narrow the data range and improve query efficiency; 2. Low cardinality index may lead to full table scanning and reduce query performance; 3. In joint index, high cardinality sequences should be placed in front to optimize query.

MySQL: Resources and Tutorials for New UsersMySQL: Resources and Tutorials for New UsersApr 14, 2025 am 12:16 AM

The MySQL learning path includes basic knowledge, core concepts, usage examples, and optimization techniques. 1) Understand basic concepts such as tables, rows, columns, and SQL queries. 2) Learn the definition, working principles and advantages of MySQL. 3) Master basic CRUD operations and advanced usage, such as indexes and stored procedures. 4) Familiar with common error debugging and performance optimization suggestions, such as rational use of indexes and optimization queries. Through these steps, you will have a full grasp of the use and optimization of MySQL.

Real-World MySQL: Examples and Use CasesReal-World MySQL: Examples and Use CasesApr 14, 2025 am 12:15 AM

MySQL's real-world applications include basic database design and complex query optimization. 1) Basic usage: used to store and manage user data, such as inserting, querying, updating and deleting user information. 2) Advanced usage: Handle complex business logic, such as order and inventory management of e-commerce platforms. 3) Performance optimization: Improve performance by rationally using indexes, partition tables and query caches.

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
4 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Best Graphic Settings
4 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. How to Fix Audio if You Can't Hear Anyone
4 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
WWE 2K25: How To Unlock Everything In MyRise
1 months agoBy尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

DVWA

DVWA

Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software

EditPlus Chinese cracked version

EditPlus Chinese cracked version

Small size, syntax highlighting, does not support code prompt function

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Safe Exam Browser

Safe Exam Browser

Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.