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解决Mysql在使用innobackupex无法备份数据库一次问题

2016-08-19 10:03 821 查看
环境:Linux6.5 Mysql 5.6

有一次在检查数据库备份文件时,发现没有产生备份文件,觉得奇怪,原来每天都是正常的在跑备份,突然一下就备份失败了,检查备份输出的日志,出现以下错误。

Using server version 5.7.9

innobackupex version 2.4.3 based on MySQL server 5.7.11 Linux (x86_64) (revision id: 6a46905)

xtrabackup: uses posix_fadvise().

xtrabackup: cd to /home/mysql/data

xtrabackup: open files limit requested 0, set to 1024

xtrabackup: using the following InnoDB configuration:

xtrabackup:   innodb_data_home_dir = .

xtrabackup:   innodb_data_file_path = ibdata1:12M:autoextend

xtrabackup:   innodb_log_group_home_dir = .

xtrabackup:   innodb_log_files_in_group = 2

xtrabackup:   innodb_log_file_size = 50331648

InnoDB: Number of pools: 1

160818 11:08:32 >> log scanned up to (528047742096)

xtrabackup: Generating a list of tablespaces

InnoDB: Allocated tablespace ID 3677 for dbmycat10/RODS, old maximum was 0

160818 11:08:33 >> log scanned up to (528047742803)

160818 11:08:34 >> log scanned up to (528047743055)

160818 11:08:35 >> log scanned up to (528047744302)

160818 11:08:36 >> log scanned up to (528047744302)

160818 11:08:37 >> log scanned up to (528047744446)

160818 11:08:38 >> log scanned up to (528047744833)

160818 11:08:39 >> log scanned up to (528047747274)

160818 11:08:40 >> log scanned up to (528047748319)

160818 11:08:41 >> log scanned up to (528047748319)

160818 11:08:42 >> log scanned up to (528047750023)

160818 11:08:43 >> log scanned up to (528047750511)

160818 11:08:44 >> log scanned up to (528047750511)

160818 11:08:45 >> log scanned up to (528047750970)

160818 11:08:46 >> log scanned up to (528047750970)

160818 11:08:47 >> log scanned up to (528047752614)

160818 11:08:48 >> log scanned up to (528047752871)

InnoDB: Operating system error number 24 in a file operation.

InnoDB: Error number 24 means 'Too many open files'

InnoDB: Some operating system error numbers are described at http://dev.mysql.com/doc/refman/5.7/en/operating-system-error-codes.html
InnoDB: File ./ABC/XX.ibd: 'open' returned OS error 124. Cannot continue operation

InnoDB: Cannot continue operation.

[mysql@xdatabase01 FullBak]$ 

这里主要错误信息为Error number 24 means 'Too many open files',无法打开更多的文件。这里是指mysql进程超出了打开最多的文件数量,检查下数据文件data目录下的文件总数。

[mysql@database01~] find data -type f|wc -l

2584

这里是2584个

登录mysql数据库

mysql>show variables like '%open_files%';

innodb_open_files  2000

这里innodb_open_files 的意思如下:

innodb_open_files 
作用:限制Innodb能打开的表的数据。

设置的是2000,但是data下已经有2584个了,因此报无法打开更多的文件数,现在需要重新加大一下,修改my.cnf文件,设置innodb_open_files=5000,这个根据自己的一个业务需求来设定。

设置完后,需要重启数据库才能生效。然后重新跑备份脚本,可以正常备份

        
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