InnoDB Error Table mysql.innodb_table_stats not found


Follow these steps to recover from this innodb error "InnoDB: Error: Table mysql.innodb_table_stats not found.".

First try to drop these tables from a mysql console:

USE mysql;
DROP TABLE innodb_index_stats;
DROP TABLE innodb_table_stats;
DROP TABLE slave_master_info;
DROP TABLE slave_relay_log_info;
DROP TABLE slave_worker_info;

This may throw some errors. If your mysql data folder is somewhere different than the default /var/lib/mysql, you should change that below. Execute these in a terminal to remove remaining table files from the mysql database:

rm -f /var/lib/mysql/mysql/innodb_index_stats.{frm,ibd}
rm -f /var/lib/mysql/mysql/innodb_table_stats.{frm,ibd}
rm -f /var/lib/mysql/mysql/slave_master_info.{frm,ibd}
rm -f /var/lib/mysql/mysql/slave_relay_log_info.{frm,ibd}
rm -f /var/lib/mysql/mysql/slave_worker_info.{frm,ibd}

Then login to a mysql console and re-create those tables:

USE mysql;
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';

Finally restart mysql: /etc/init.d/mysql restart

If it won't start up, try to set innodb_force_recovery=1 in /etc/mysql/my.cnf below the [mysqld] section, restart it and have a look at the logs. MySQL should recover.