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May 27, 2016 pm 02:12 PM

mysqlubuntudatabaseuser

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在进行数据备份、恢复时，碰到的问题罗列如下：

问题一：1.数据迁移异常，ubuntu下迁移完数据目录，数据库不能启动

数据库默认使用mysql用户来启动数据库，请检查新迁移的数据目录，mysql对其是否具有读写权限。如果没有，请授予其读写权限。如果是在ubuntu环境中使用apt-get命令安装的数据库，修要修改/etc/apparmor.d/usr.sbin.mysqld的内容，添加新增目录的相关信息。

问题二：2.flush log引发备份为空的问题

表现：使用mysqldump -uxxx -pxxxx --flush-logs --master-data=2 --hex-blob -R -f --all-databases 2>>$tmpfile时发现$tmpfile里面的内容是空的。
解决方法：是mysql版本问题，该版本存在此bug，mysql5.5.28已修复此bug。

问题三：3.mysqldump报error1449

使用mysqldump导出数据库的时候出现这个错误: mysqldump: Got error: 1449: The user specified as a definer ('jing'@'%') does not exist when using LOCK TABLES.
解决方法：数据库创建时使用的是脚本创建，里面对某些对象的定义，使用了definer。但数据库中是并不存在这个用户的，解决方法是，修改这些个对象的definer对象。

问题四：4.数据时，函数不能导入，数据导入后，执行计划不能定时执行

函数不能成功导入时，如果可以，关闭二进制日志，再导入函数。如二进制日志要求打开，设置：

log_bin_trust_function_creators=on;

数据导入后，保证执行计划定时执行，请设置：

event_scheduler=on

问题五：5.数据恢复时，报1114错误 the table is full

该表使用的是memory存储引擎，如果批量导入会因为数据库内存临时表设置过小而报错。增大内存临时表大小
set global max_heap_table_size=167772160;
set global tmp_table_size=167772160;

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