记一次SQLServer数据库误删数据找回
昨天 同事在本机清理数据库表时,连接到了生产机,误删了二十几张表,幸好是晚上加班的时候删除的,生产机上当时是一天一备份,还原备份是最后的策略,最关键的还是要找回数据。 生产机环境是server2008 R2、 sqlserver2012,使用delete语句删除的表现在开始
昨天 同事在本机清理数据库表时,连接到了生产机,误删了二十几张表,幸好是晚上加班的时候删除的,生产机上当时是一天一备份,还原备份是最后的策略,最关键的还是要找回数据。
生产机环境是server2008 R2、 sqlserver2012,使用delete语句删除的表现在开始还原,还原可参考dudu的这篇文章(链接),其中使用Recovery for SQL Server工具还原,发现还原的数据字段值为demo,所以最后还是用sql命令去还原的,用sql命令,微软官方给的比较明细(链接)。
一、还原需要的条件设置
使用命令,是通过sqlserver的事务日志以及一个误删除前的数据库的完整备份进行还原,所以在sqlserver2012的维护计划向导中,要建立完整备份,差异备份和事务日志,具体如下
以及在数据库属性,选项设置中,设置为完整备份,具体如下图
做好如上两个设置,数据库误删后找回数据就会非常轻松,现在说一下如何还原sqlserver数据到故障点。
二、还原命令
还原主要分为四步走:
1、出现故障后,首先执行备份事务日志命令,这里以AdventureWorks作为数据库名。命令如下:
BACKUP LOG AdventureWorks TO DISK = 'C:\SQLServerBackups\AdventureWorks_transcationlog.bak' WITH NORECOVERY;2、从完整备份还原数据
RESTORE DATABASE [QASupervision] FROM DISK=<span>'M:\Database\OA\AdventureWorks_Fullbackup_2014_03_18_010002_0155764.bak'</span> WITH NORECOVERY, REPLACE3、从差异备份还原数据
RESTORE DATABASE [QASupervision] FROM DISK=<span>'M:\Database\OA\AdventureWorks_diffbackup_2014_03_18_020002_0155764.bak'</span> WITH NORECOVERY, REPLACE4、从事务日志还原数据,还原到某个时间点之前
DECLARE @dt datetime SELECT @dt=DATEADD(HOUR,-16,GETDATE()) select @dt RESTORE LOG [QASupervision] FROM DISK='C:\SQLServerBackups\AdventureWorks_transcationlog.bak' WITH STOPAT=@dt,RECOVERY5、还原数据库,如果数据库提示正在还原中,则执行此命令即可。
RESTORE DATABASE AdventureWorks WITH RECOVERY

MySQL is suitable for beginners to learn database skills. 1. Install MySQL server and client tools. 2. Understand basic SQL queries, such as SELECT. 3. Master data operations: create tables, insert, update, and delete data. 4. Learn advanced skills: subquery and window functions. 5. Debugging and optimization: Check syntax, use indexes, avoid SELECT*, and use LIMIT.

MySQL efficiently manages structured data through table structure and SQL query, and implements inter-table relationships through foreign keys. 1. Define the data format and type when creating a table. 2. Use foreign keys to establish relationships between tables. 3. Improve performance through indexing and query optimization. 4. Regularly backup and monitor databases to ensure data security and performance optimization.

MySQL is an open source relational database management system that is widely used in Web development. Its key features include: 1. Supports multiple storage engines, such as InnoDB and MyISAM, suitable for different scenarios; 2. Provides master-slave replication functions to facilitate load balancing and data backup; 3. Improve query efficiency through query optimization and index use.

SQL is used to interact with MySQL database to realize data addition, deletion, modification, inspection and database design. 1) SQL performs data operations through SELECT, INSERT, UPDATE, DELETE statements; 2) Use CREATE, ALTER, DROP statements for database design and management; 3) Complex queries and data analysis are implemented through SQL to improve business decision-making efficiency.

The basic operations of MySQL include creating databases, tables, and using SQL to perform CRUD operations on data. 1. Create a database: CREATEDATABASEmy_first_db; 2. Create a table: CREATETABLEbooks(idINTAUTO_INCREMENTPRIMARYKEY, titleVARCHAR(100)NOTNULL, authorVARCHAR(100)NOTNULL, published_yearINT); 3. Insert data: INSERTINTObooks(title, author, published_year)VA

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.


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