背景

nikeodong之前做了项目的数据库主从，在全备的过程发现数据库是越来越大了；最后发现是资源不释放的问题。

目的

为了解决mysql资源不释放的问题。

步骤

1、vim /etc/my.cnf，关闭log_bin日志。

2、导出数据库sql：time mysqldump -q -uroot -p'dpENoKNhG#y0w4sK' --max_allowed_packet=128M --net_buffer_length=16M -e --all-databases > XXXX.sql

3、删除mysql的data日志

通过命令：show variables like 'datadir'，找到data目录    或者通过vim /etc/my.cnf-->找到里面的datadir的值，找到data目录

4、重新导入表空间：mysql_install_db --user=mysql --basedir=/usr/local/mysql --datadir=/home/data/mysql --default-storage-engine=INNODB&

5、重新开启lob_bin日志

注意：在执行第二步的时候可能会报错

报错：Error: Table "mysql"."innodb_index_stats" not found。如下是解决方法

显示有几个系统表不存在.innodb_table_stats innodb_index_stats 或者 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,因为是innodb引擎,所以不能访问了.解决的方法如下：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;删除相关的.frm .ibd文件rm -rf innodb_index_stats* rm -rf innodb_table_stats* rm -rf slave_master_info* rm -rf slave_relay_log_info* rm -rf slave_worker_info*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';