在做实验时，使用mysqldump命令报错

[root@linux-mysql02 3306]# mysqldump -uroot -p123456 -S /u02/data/3306/mysql.sock -A -B --events | gzip > /opt/rep.sql.gz

mysqldump: Got error: 1146: Table 'mysql.innodb_index_stats' doesn't exist when using LOCK TABLES

然后查看错误日志：

[root@linux-mysql02 ~]# vim /u02/data/3306/mysql_oldboy3306.err

2017-08-09 15:21:10 19726 [Warning] InnoDB: Cannot open table mysql/innodb_index_stats from the internal data dictionary of InnoDB though the

.frm file for the table exists. See http://dev.mysql.com/doc/refman/5.6/en/innodb-troubleshooting.html for how you can resolve the problem.

[root@linux-mysql02 ~]# mysql -uroot -p123456 -S /u02/data/3306/mysql.sock

mysql> use mysql

mysql> show tables;

mysql> show create table slave_master_info\G

ERROR 1146 (42S02): Table 'mysql.slave_master_info' doesn't exist

最后测试发现以下几个系统表不存在.

innodb_table_stats

innodb_index_stats

slave_master_info

slave_relay_log_info

slave_worker_info

这是因为数据库初始化的时候,dba可能删除过ibdata1文件

虽然重启之后,数据库会自动创建一个ibdata1文件,但是上述系统表也是innodb引擎,所以不能访问了.

这虽然不会影响业务,但是使用innobackupex备份的时候,会写入错误日志.

最后错误日志里,都是这种信息.影响日常检查。

解决的方法.

1.删除上述系统表

drop table mysql.innodb_index_stats;

drop table mysql.innodb_table_stats;

drop table mysql.slave_master_info;

drop table mysql.slave_relay_log_info;

drop table mysql.slave_worker_info;

2.删除相关的.frm .ibd文件

rm -f innodb_index_stats*

rm -f innodb_table_stats*

rm -f slave_master_info*

rm -f slave_relay_log_info*

rm -f slave_worker_info*

3.重新创建上述系统表

CREATE TABLE `innodb_index_stats` (

`database_name` varchar(64) COLLATE utf8_bin NOT NULL,

`table_name` varchar(64) COLLATE utf8_bin NOT NULL,

`index_name` varchar(64) COLLATE utf8_bin NOT NULL,

`last_update` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,

`stat_name` varchar(64) COLLATE utf8_bin NOT NULL,

`stat_value` bigint(20) unsigned NOT NULL,

`sample_size` bigint(20) unsigned DEFAULT NULL,

`stat_description` varchar(1024) COLLATE utf8_bin NOT NULL,

PRIMARY KEY (`database_name`,`table_name`,`index_name`,`stat_name`)

) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin STATS_PERSISTENT=0;

CREATE TABLE `innodb_table_stats` (

`database_name` varchar(64) COLLATE utf8_bin NOT NULL,

`table_name` varchar(64) COLLATE utf8_bin NOT NULL,

`last_update` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,

`n_rows` bigint(20) unsigned NOT NULL,

`clustered_index_size` bigint(20) unsigned NOT NULL,

`sum_of_other_index_sizes` bigint(20) unsigned NOT NULL,

PRIMARY KEY (`database_name`,`table_name`)

) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin STATS_PERSISTENT=0;

CREATE TABLE `slave_master_info` (

`Number_of_lines` int(10) unsigned NOT NULL COMMENT 'Number of lines in the file.',

`Master_log_name` text CHARACTER SET utf8 COLLATE utf8_bin NOT NULL COMMENT 'The name of the master binary log currently being read from the master.',

`Master_log_pos` bigint(20) unsigned NOT NULL COMMENT 'The master log position of the last read event.',

`Host` char(64) CHARACTER SET utf8 COLLATE utf8_bin NOT NULL DEFAULT '' COMMENT 'The host name of the master.',

`User_name` text CHARACTER SET utf8 COLLATE utf8_bin COMMENT 'The user name used to connect to the master.',

`User_password` text CHARACTER SET utf8 COLLATE utf8_bin COMMENT 'The password used to connect to the master.',

`Port` int(10) unsigned NOT NULL COMMENT 'The network port used to connect to the master.',

`Connect_retry` int(10) unsigned NOT NULL COMMENT 'The period (in seconds) that the slave will wait before trying to reconnect to the master.',

`Enabled_ssl` tinyint(1) NOT NULL COMMENT 'Indicates whether the server supports SSL connections.',

`Ssl_ca` text CHARACTER SET utf8 COLLATE utf8_bin COMMENT 'The file used for the Certificate Authority (CA) certificate.',

`Ssl_capath` text CHARACTER SET utf8 COLLATE utf8_bin COMMENT 'The path to the Certificate Authority (CA) certificates.',

`Ssl_cert` text CHARACTER SET utf8 COLLATE utf8_bin COMMENT 'The name of the SSL certificate file.',

`Ssl_cipher` text CHARACTER SET utf8 COLLATE utf8_bin COMMENT 'The name of the cipher in use for the SSL connection.',

`Ssl_key` text CHARACTER SET utf8 COLLATE utf8_bin COMMENT 'The name of the SSL key file.',

`Ssl_verify_server_cert` tinyint(1) NOT NULL COMMENT 'Whether to verify the server certificate.',

`Heartbeat` float NOT NULL,

`Bind` text CHARACTER SET utf8 COLLATE utf8_bin COMMENT 'Displays which interface is employed when connecting to the MySQL server',

`Ignored_server_ids` text CHARACTER SET utf8 COLLATE utf8_bin COMMENT 'The number of server IDs to be ignored, followed by the actual server IDs',

`Uuid` text CHARACTER SET utf8 COLLATE utf8_bin COMMENT 'The master server uuid.',

`Retry_count` bigint(20) unsigned NOT NULL COMMENT 'Number of reconnect attempts, to the master, before giving up.',

`Ssl_crl` text CHARACTER SET utf8 COLLATE utf8_bin COMMENT 'The file used for the Certificate Revocation List (CRL)',

`Ssl_crlpath` text CHARACTER SET utf8 COLLATE utf8_bin COMMENT 'The path used for Certificate Revocation List (CRL) files',

`Enabled_auto_position` tinyint(1) NOT NULL COMMENT 'Indicates whether GTIDs will be used to retrieve events from the master.',

PRIMARY KEY (`Host`,`Port`)

) ENGINE=InnoDB DEFAULT CHARSET=utf8 STATS_PERSISTENT=0 COMMENT='Master Information';

CREATE TABLE `slave_relay_log_info` (

`Number_of_lines` int(10) unsigned NOT NULL COMMENT 'Number of lines in the file or rows in the table. Used to version table definitions.',

`Relay_log_name` text CHARACTER SET utf8 COLLATE utf8_bin NOT NULL COMMENT 'The name of the current relay log file.',

`Relay_log_pos` bigint(20) unsigned NOT NULL COMMENT 'The relay log position of the last executed event.',

`Master_log_name` text CHARACTER SET utf8 COLLATE utf8_bin NOT NULL COMMENT 'The name of the master binary log file from which the events in the relay log file were read.',

`Master_log_pos` bigint(20) unsigned NOT NULL COMMENT 'The master log position of the last executed event.',

`Sql_delay` int(11) NOT NULL COMMENT 'The number of seconds that the slave must lag behind the master.',

`Number_of_workers` int(10) unsigned NOT NULL,

`Id` int(10) unsigned NOT NULL COMMENT 'Internal Id that uniquely identifies this record.',

PRIMARY KEY (`Id`)

) ENGINE=InnoDB DEFAULT CHARSET=utf8 STATS_PERSISTENT=0 COMMENT='Relay Log Information';

CREATE TABLE `slave_worker_info` (

`Id` int(10) unsigned NOT NULL,

`Relay_log_name` text CHARACTER SET utf8 COLLATE utf8_bin NOT NULL,

`Relay_log_pos` bigint(20) unsigned NOT NULL,

`Master_log_name` text CHARACTER SET utf8 COLLATE utf8_bin NOT NULL,

`Master_log_pos` bigint(20) unsigned NOT NULL,

`Checkpoint_relay_log_name` text CHARACTER SET utf8 COLLATE utf8_bin NOT NULL,

`Checkpoint_relay_log_pos` bigint(20) unsigned NOT NULL,

`Checkpoint_master_log_name` text CHARACTER SET utf8 COLLATE utf8_bin NOT NULL,

`Checkpoint_master_log_pos` bigint(20) unsigned NOT NULL,

`Checkpoint_seqno` int(10) unsigned NOT NULL,

`Checkpoint_group_size` int(10) unsigned NOT NULL,

`Checkpoint_group_bitmap` blob NOT NULL,

PRIMARY KEY (`Id`)

) ENGINE=InnoDB DEFAULT CHARSET=utf8 STATS_PERSISTENT=0 COMMENT='Worker Information';

4.如果是Slave备机,停止复制,记录pos等信息

mysql> stop slave;

Query OK, 0 rows affected (0.09 sec)

5.重启数据库

6.如果Slave启动报错,则使用步骤4的信息,重新change master

再删除ibdata1文件的时候,一定要想起系统数据库还有5张innodb表...