mysqldump

目录 事务 事务的特性 原子性(Atomicity)： 一致性(Consistency)： 隔离性(Isolation)： 持久性(Durability)： 存储引擎 InnoDB ：保时捷引擎 MyIsam：奔奔引擎 视图 使用 增加视图 删除视图 触发器 存储过程 创建 函数 数据库的备份 语法 示列 事务 通俗的说，事物指一组操作，要么都执行成功，要么都执行失败 使用事务： start transactino sql语句 commit/rowllback # 演示： mysql> select * from t1; +----+------+--------+ | id | name | salary | +----+------+--------+ | 1 | aa | 1000 | | 2 | bb | 2000 | | 3 | dd | 3000 | +----+------+--------+ mysql> start transaction; mysql> update t1 set salary=100 where name='aa'; mysql> select * from t1; +----+------+--------+ | id | name | salary | +----+------+--------+ | 1 | aa | 100 | | 2

I have two databases in MySQL that already have data. they have exactly the same schema. I would like to merge those two databases into one only. I tried: mysqldump -u root -p --databases database1 database2 database3 > database1_database2_da However, when I try to open database1_database2_da , I only end up with data from one of the database, but not all of them. I also want to mention that the two databases have their records starting at 1, since they are automatically generated. Do you think there is a way to merge those two databases without losing data from any of them? Run mysqldump on

1、启动MySQL数据库(centos7为例 ) systemctl restart mariadb.service 或 systemctl restart mysqld.service systemctl status mysqld.service //查看mysql状态 2、查看数据库 SHOW DATABASES; 3、选择数据库 USE ss16; 4、创建数据库 CREATE DATABASE IF NOT EXISTS ss16; 5、删除数据库 DROP DATABASE IF EXISTS ss16; 6、数据库备份 mysqldump -uroot -p ss16>C:/ss16.sql; mysqldump -h 192.168.0.24 -u root -p eb2>/tmp/eb2.sql; -- 防止锁表 针对Innodb引擎 mysqldump -h 192.168.0.24 -u root -p --single-transaction eb2>/tmp/eb2.sql; -- 备份库中的指定表（多个表空格隔开） mysqldump -h10.1.62.40 -u root -p train online_back online_course> c:\online_data.sql; -- 备份库中的指定表中的部分数据 mysqldump -h10.1

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I was wondering if I can prevent mysqldump inserting this commands /*!50017 DEFINER=`root`@`localhost`*/ Or if I have to do it afterwards with sed, for example Thanks! 回答1: This issue has been around since 2006 with no sign of ever being fixed. I have, however, piped it through grep (linux only) to trim out the definer lines before writing the dump file: mysqldump -u dbuser -p dbname | grep -v 'SQL SECURITY DEFINER' > dump.sql A bit of a mouthful (or keyboardful?) but I think it's the only way. 文章来源: Skip or ignore definers in Mysqldump

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I want to export my database and i am using this code: mysqldump -p -u markazo_b markazo_b > /tmp/file.sql But SSH show this error: -bash: mysqldump: command not found How i fix this problem? 回答1: After reading your conversation, I found the solution (for me, at least). It was a permissions issue. Issuing which mysqldump in the terminal shows /usr/bin/mysqldump . When I then issue cd /usr/bin/ and afterward mysqldump I receive the same indications you were seeing: mysqldump: command not found . Inside /usr/bin I then issued sudo mysqldump

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I run the following command from the Windows command line to backup my database: ...\right_path\mysqldump --add-drop-database --databases my_database_name --defaults-extra-file=d:\1.cnf where d:\1.cnf contains the following: [client] user="my_user" password="my_password" Unfortunately, I got the following error message: mysqldump: unknown variable 'defaults-extra-file=d:\1.cnf' If I do: ...\right_path\mysqldump --add-drop-database --databases my_database_name --user="my_user" --password="my_password" it works as expected. What am I doing

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: When I try to backup using mysqldump from ssh, I run the following command on machine 10.64.1.1. It gives the following error. mysqldump --user=test -p=password --host=10.64.1.2 --tab=. databasename tablename mysqldump: Got error: 1045: Access denied for user 'test'@'10.64.1.1' (using password: YES) when trying to connect However, I can access mysql using the same user and password. mysql --user=test -p[password] Current user: test@10.64.1.1 SSL: Not in use Current pager: stdout Using outfile: '' Using delimiter: ; Server version: 5.0.91-50