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MySQL数据库的同步。 MySQL是开源的关系型数据库系统。主从同步复制(Replication)是从一台MySQL数据库服务器(主服务器master)复制数据到另一个服务器(从服务器slave)的一个进程。 配置主服务器(master)
1、编辑数据库配置文件my.cnf 或 my.ini (windows),一般在/etc/目录下。 #vi /etc/my.cnf 在[mysqld]的下面加入下面代码:log-bin=mysql-bin server-id=1innodb_flush_log_at_trx_commit=1sync_binlog=1binlog-do-db=wordpressbinlog_ignore_db=mysql server-id=1中的1可以任定义,只要是唯一的就行。 binlog-do-db=wordpress是表示只备份wordpress。 binlog_ignore_db=mysql表示忽略备份mysql。 不加binlog-do-db和binlog_ignore_db,那就表示备份全部数据库。 2、然后重启MySQL: #service mysqld restart 3、登录MySQL服务器。 #mysql -uroot -p 在主服务器新建一个用户赋予“REPLICATION SLAVE”的权限。你不需要再赋予其它的权限。在下面的命令,把X.X.X.X替换为从服务器的IP。 mysql>CREATE USER 'user'@ 'X.X.X.X' IDENTIFIED BY 'password'; mysql>GRANT REPLICATION SLAVE ON *.* TO 'user'@'X.X.X.X' IDENTIFIED BY 'password'; 4、执行以下命令锁定数据库以防止写入数据。 mysql>FLUSH TABLES WITH READ LOCK; 5、退出mysql命令行,导出数据库 #mysqldump -u root -p123456 --all-databases > /root/all.sql 6、使用scp命令传输数据库文件all.sql到从服务器。 #scp /root/all.sql root@www.example.com:/root 7、再次连接数据库进入mysql命令行查看master状态。 mysql>SHOW MASTER STATUS; 请记下显示的信息,配置从服务器会用到。+——————+———-+————–+——————+| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |+——————+———-+————–+——————+| mysql-bin.000001| 253| dbispconfig | mysql |+——————+———-+————–+——————+1 row in set (0.00 sec) 8、解锁数据表。 mysql>UNLOCK TABLES; 配置从服务器(slave) 登录从服务器。 1、导入主服务器的数据库。 #mysql -u root -p123456 CHANGE MASTER TOMASTER_HOST='X.X.X.X',MASTER_USER='user',MASTER_PASSWORD='password',MASTER_PORT=3306,MASTER_LOG_FILE='mysql-bin.000001,MASTER_LOG_POS=253,MASTER_CONNECT_RETRY=10; 注: MASTER_HOST:主服务器的IP。 MASTER_USER:配置主服务器时建立的用户名 MASTER_PASSWORD:用户密码 MASTER_PORT:主服务器mysql端口,如果未曾修改,默认即可。 这里master_log_file和master_log_pos就是前面show master status的结果。 5、启动slave进程。 mysql>START SLAVE; mysql>SHOW SLAVE STATUS; 如果能查出一条记录 那么,配置成功 6、查看mysql的日志,一般在/var/log/目录下,如果启动成功,你应该会看到类似下面的日志。 091104 8:42:02 [Note] Slave I/O thread: connected to master ‘root@X.X.X.X:3306?, replication started in log ‘mysql-bin.000001? at position 98 现在主服务器和从服务器已经配置好了。另外你可能需要设置主服务器的数据库二进制日志的过期时间,可以在配置文件中使用参数expire_logs_days来设定。 java spring事务设置,方法头部设置@Transactional(readOnly=true) java 连接 驱动 设置jdbc.connection.driver=com.mysql.jdbc.ReplicationDriverjdbc.connection.url=jdbc:mysql:replication://192.168.202.190,192.168.202.190/job?useUnicode=true&characterEncoding=utf-8 作者 yjflinchong bitsCN.com

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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