这种情况一般就是本机磁盘空间不够,但是有些数据需要迁移。昨天就遇见这么一个情况: 一朋友需要将一个400GB的日志表从10g数据导入到11g中,但是因为10g数据库所在主机磁盘空间不够所以才想不落地方式导出导入 这里给大家介绍两种方式: 1、network_link 2、
这种情况一般就是本机磁盘空间不够,但是有些数据需要迁移。昨天就遇见这么一个情况:一朋友需要将一个400GB的日志表从10g数据导入到11g中,但是因为10g数据库所在主机磁盘空间不够所以才想不落地方式导出导入
这里给大家介绍两种方式:
1、network_link
2、pipe
先说第一种方式,需要配置tnsnames.ora 和创建dblink:
zbdba= (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = zbdba)(PORT = 1521)) ) (CONNECT_DATA = (SID = zbdba) ) )
创建dblink:
CREATE DATABASE LINK <database link name> CONNECT TO <remote database user name> IDENTIFIED BY <remote database password> USING '<tnsname connect to remote>'
导出数据:
impdp zbdba/zbdba network_link=zbdba_link remp_schema=source_schema:target:shcema remap_tablespace=source_tablespace:target:tablespace
同时impdp 带network_link 导入
第二种方法:
source: mknod /tmp/exp_pipe p target: mknod /tmp/imp_pipe p 配置两个机器的互信 dd if=/tmp/exp_pipe | ssh 192.168.56.42 dd of=/tmp/imp_pipe 然后打开另外一个窗口进行导入: exp zbdba/zbdba file=/tmp/exp_pipe log=zbdba.log tables=zbdba
注意第一种方法在指定多个表的时候可能会出现bug

The main role of MySQL in web applications is to store and manage data. 1.MySQL efficiently processes user information, product catalogs, transaction records and other data. 2. Through SQL query, developers can extract information from the database to generate dynamic content. 3.MySQL works based on the client-server model to ensure acceptable query speed.

The steps to build a MySQL database include: 1. Create a database and table, 2. Insert data, and 3. Conduct queries. First, use the CREATEDATABASE and CREATETABLE statements to create the database and table, then use the INSERTINTO statement to insert the data, and finally use the SELECT statement to query the data.

MySQL is suitable for beginners because it is easy to use and powerful. 1.MySQL is a relational database, and uses SQL for CRUD operations. 2. It is simple to install and requires the root user password to be configured. 3. Use INSERT, UPDATE, DELETE, and SELECT to perform data operations. 4. ORDERBY, WHERE and JOIN can be used for complex queries. 5. Debugging requires checking the syntax and use EXPLAIN to analyze the query. 6. Optimization suggestions include using indexes, choosing the right data type and good programming habits.

MySQL is suitable for beginners because: 1) easy to install and configure, 2) rich learning resources, 3) intuitive SQL syntax, 4) powerful tool support. Nevertheless, beginners need to overcome challenges such as database design, query optimization, security management, and data backup.

Yes,SQLisaprogramminglanguagespecializedfordatamanagement.1)It'sdeclarative,focusingonwhattoachieveratherthanhow.2)SQLisessentialforquerying,inserting,updating,anddeletingdatainrelationaldatabases.3)Whileuser-friendly,itrequiresoptimizationtoavoidper

ACID attributes include atomicity, consistency, isolation and durability, and are the cornerstone of database design. 1. Atomicity ensures that the transaction is either completely successful or completely failed. 2. Consistency ensures that the database remains consistent before and after a transaction. 3. Isolation ensures that transactions do not interfere with each other. 4. Persistence ensures that data is permanently saved after transaction submission.

MySQL is not only a database management system (DBMS) but also closely related to programming languages. 1) As a DBMS, MySQL is used to store, organize and retrieve data, and optimizing indexes can improve query performance. 2) Combining SQL with programming languages, embedded in Python, using ORM tools such as SQLAlchemy can simplify operations. 3) Performance optimization includes indexing, querying, caching, library and table division and transaction management.

MySQL uses SQL commands to manage data. 1. Basic commands include SELECT, INSERT, UPDATE and DELETE. 2. Advanced usage involves JOIN, subquery and aggregate functions. 3. Common errors include syntax, logic and performance issues. 4. Optimization tips include using indexes, avoiding SELECT* and using LIMIT.


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