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备份数据方法:
一:sql语句。
LOCKS TABLES tablename READ;//读锁定
尝试锁定表之前,LOCK TABLES不是事务安全型的,会隐含地提交所有活性事务,同时,会隐含地开始一项事务(例如,使用START TRANSACTION),
所以,对事务表(如InnoDB)使用LOCK TABLES的正确方法是,设置AUTOCOMMIT=0
FLUSH TABLES,
SELECT * INTO OUTFILE 'data_bck.sql' FIELDS TERMINATED BY ',' FROM tablename;
UNLOCK TABLES;
二:mysqldump工具。
完全备份数据库中的一个表:
mysqldump -h192.168.4.20 -uusername -puserpswd dbname tablename>data_bck.sql
完全备份某个数据库:
mysqldump -h192.168.4.20 -uusername -puserpswd dbname tablename>data_bck.sql
完全备份所有数据库:
mysqldump -h192.168.4.20 -uusername -puserpswd --single-transaction --all-databases>data_bck.sql
完全备份所有数据库后停用以前所有增量日志并生成新日志:
mysqldump -h192.168.4.20 -uusername -puserpswd --single-transaction --flush-logs --master-data=2 --all-databases>data_bck.sql
完全备份所有数据库后删除以前所有增量日志并生成新日志:
mysqldump -h192.168.4.20 -uusername -puserpswd --single-transaction --flush-logs --master-data=2 --all-databases --delete-master-logs>data_bck.sql
增量备份:
先执行完全备份,然后执行更新日志:
mysqladmin -h192.168.4.20 -uusername -puserpswd flush-logs
三:直接复制data目录。
停止mysql服务或者锁定数据库表,复制data目录到备份位置,启动mysql服务或者解锁数据库表。
恢复数据方法:
一:sql语句。
LOAD DATA INFILE 'data_bck.sql' INTO TABLE tablename FIELDS TERMINATED BY ',';
二:mysql工具。
完全恢复:
mysql -h192.168.4.20 -uusername -puserpswd dbname
mysqlbinlog log-bin.000001 log-bin.000008 | mysql
另外,有一个很有趣又很实用的小技巧:tee.
它将你操作和输出的全部可视信息都保存进了一个文件里面,可以用来生成表格式的文件、报表制作、简单的备份。
用法是这样的:
在mysql命令行下,执行下面的命令:
>tee E:/heihei.sql
这样就创建了记录文件,接下来,我们的所有操作和所有输出结果都将被原样记录下来,就像照片一样。
>select * from tablename;
那么这条命令和查询结果都将被记录到这个文件里面,很好玩的。不过,它很仔细的,就连你的错误命令都会记录下来的。可别被笑话啊。:)

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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