由于某些原因,需要将2个数据库实例合并为1个,也就是说要把其中的一台迁移到另外一台上面。 背景介绍 :下面的B,C代表2个实例,要把B中相关东西迁移到C实例上面。其中B上面有一部分的同步是从另外一台服务器同步过来,这里说是A吧,迁移版本相同(我操作的
由于某些原因,需要将2个数据库实例合并为1个,也就是说要把其中的一台迁移到另外一台上面。
背景介绍 :下面的B,C代表2个实例,要把B中相关东西迁移到C实例上面。其中B上面有一部分的同步是从另外一台服务器同步过来,这里说是A吧,迁移版本相同(我操作的版本为SQL SERVER 2008R2)
简单步骤如下:
1. 复制A实例上面的 Login和 Job 到B上面
Login的迁移可以参考:http://support.microsoft.com/kb/918992
Job的迁移可以使用资源管理器进行批量的生成,可以参见: http://www.cnblogs.com/dudu/archive/2013/02/27/sql-server-export-job.html
如果是新的环境可以采用还有msdb的方法来建立Job
2. 把B中有从A同步过来的表查询出来,然后建立A->C对应的同步连路
3. 检查B中服务器用户对应有权限是否在C中都已经存在
4. 停掉B中的应用程序,保证没有进程 (涉及非DBA人员)
然后进行备份,停掉服务(或者把库设置为离线) , 在C中还原
在完成步骤 1-3 的工作之后, 需要与非DBA人呗确认切换的时间, 有什么问题需要及时联系
5. 需要把A->B的复制连路断掉,删除就OK了。
其中第4步也可以用镜像或者是复制
镜像: 可以对数据库进行数据库镜像配置,停了业务,切换到镜像服务器。
复制: 对数据库的表都建立复制,完成之后,等待连接串切换到订阅端,然后进行停机操作。

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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