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mysql实现增量备份

Jun 07, 2016 pm 04:38 PM
mysql backup accomplish Notice pass

有点要注意 如果你误删了表 想通过这个恢复 必须恢复日志里面有创建表的日志 不然的话是无法回复的 ?就是必须是从你开始创建表的时候就已经记录日志了? 恢复到哪个位置 就按照哪个位置来计算 mysql ?5.0不支持增量备份 增量备份定义 ? ? mysql数据库会以二进



有点要注意 如果你误删了表 想通过这个恢复 必须恢复日志里面有创建表的日志 不然的话是无法回复的 ?就是必须是从你开始创建表的时候就已经记录日志了?


恢复到哪个位置 就按照哪个位置来计算


mysql ?5.0不支持增量备份


增量备份定义


? ? mysql数据库会以二进制形式 自动把用户对mysql数据库的操作 记录到文件 当用户希望恢复的时候可以使用备份文件 进行回复


? ? 增量备份会记录 (dml 语句 建表语句 不会记录select语句)

? ? 记录的 (a 操作语句本身 b 操作的时间 ?c 操作的位置 position)


实例

? ? 配置 my.ini文件 或者 my.conf 启用二进制备份

???log-bin=e:/mysqldb/logbin.log ? ?先设置mysql日志存放位置


? ? 配置好后 再启动模样上去了 就会在备份目录多了2个文件?

? ? logbin.index ?这个是索引文件 有哪些增量备份

????logbin.000001 ? 存放用户对数据库操作的文件


? ? 如果你想看看 这个 里面是什么东西 我们可以使用 mysql的bin目录下面的一个工具查看?

? ? 就是 mysqlbinlog.exe ?这个东西看?

????

? ? 首先用cmd进入 mysql的 bin目录下面 然后执行

? ? mysqlbinlog e:/mysqldb/logbin.000001

????

mysql 对于你的每一次操作 都会记录一次时间 同时 给你分配一个位置 (pos)

换句话说 以后我们恢复 可以根据时间点来恢复 或者根据位置来恢复


比如说 我们把一个表个drop 了 那么我们只要把表恢复到 drop之前就好了?


时间点恢复

? ? 我们可以画个流程图

? ? logbin.000001

? ? insert ...... ? 3 ? ? ? 2013-07-23 17:57:00

? ? update ..... ? 4 ? ?2013-07-23 17:59:00

?????insert ...... ? 100 ? ? ? 2013-07-23 19:57:00

? ? drop ?... ? ? ? ?101 ? ?2013-07-23 20:57:00

????

? ? 恢复的话可以这么写

? ? mysqlbinlog ?--stop-datatime="2013-07-23 20:50:00"?e:/mysqldb/logbin.000001

? ? 上面这句的意思是 一直恢复到?2013-07-23 20:50:00 ?停止

?????mysqlbinlog ?--start-datatime="2013-07-23 20:50:00"?e:/mysqldb/logbin.000001

? ? 上面这句的意思是 从2013-07-23 20:50:00 ?开始恢复


按照位置来恢复

??????? mysqlbinlog ?--stop-position="100"?e:/mysqldb/logbin.000001? |?

????? ? 上面这个语句意思是 恢复到100的位置


真实性恢复

按照位置恢复

mysqlbinlog ?--stop-position=4590?e:/mysqldb/logbin.000001? | mysql -uroot -p

按照时间恢复

mysqlbinlog ?--stop-datetime="2013-07-24 18:17:19"?e:/mysqldb/logbin.000001? | mysql -uroot -p



可以控制从什么时候开始 到什么是结束

mysqlbinlog?--start -position=4? --stop-position=106 yueliangd
ao_binglog.000001 > c:\\test1.txt




在工作中 可以每周一做一个全备份 就是 mysqldump ?

然后 启用我们的增量备份 把过期时间设为 大于等于7天

如果数据库崩溃了 就可以通过时间和位置来恢复









如何关闭 mysql 自动记录日志

找到log-bin=mysql-bin,前面添加#即可。

个别版本需要关闭

binlog_format=mixed前面添加#,否则会出现mysql无法启动。

















作者:ebw123 发表于2013-7-24 22:27:12 原文链接

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mysql实现增量备份

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