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MySQL 5.6.19升级到 5.7.9 的步骤是什么，很多新手对此不是很清楚，为了帮助大家解决这个难题，下面小编将为大家详细讲解，有这方面需求的人可以来学习下，希望你能有所收获。
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升级前版本检查+测试表创建
[root@localhost ~]# mysql -uroot -p123456 --socket=/var/lib/mysql/mysql3307.sock --port=3307 -e"create database lottery; use lottery;create table lottery.mhq as select 'test';select version();"
+-----------+
| version() |
+-----------+
| 5.6.19-log |
+-----------+
[root@localhost ~]#
软件包：
wget http://downloads.mysql.com/archives/get/file/mysql-community-client-5.7.9-1.el6.x86_64.rpm
wget http://downloads.mysql.com/archives/get/file/mysql-community-server-5.7.9-1.el6.x86_64.rpm
wget http://downloads.mysql.com/archives/get/file/mysql-community-common-5.7.9-1.el6.x86_64.rpm
wget http://downloads.mysql.com/archives/get/file/mysql-community-libs-5.7.9-1.el6.x86_64.rpm
yum安装命令：
yum install numactl*
yum localinstall --skip-broken mysql-community*
升级后验证版本和表数据
[root@localhost ~]# mysql -uroot -p123456 --socket=/var/lib/mysql/mysql3307.sock --port=3307 -EN -e" select version(); select * from lottery.mhq;"
*************************** 1. row ***************************
5.7.9-log
*************************** 1. row ***************************
test
[root@localhost ~]#
注释：
基本查询db表没问题，不过一些mysqldump用到设计到系统表时需要mysql_upgrade做下系统表升级；
升级前使用mysqldump
[root@localhost mysql]# mysqldump -uroot -p123456 -B retail_pms > /root/retail_pms.sql
mysqldump: Couldn't execute 'SHOW VARIABLES LIKE 'gtid\_mode'': Native table 'performance_schema'.'session_variables' has the wrong structure (1682)
[root@localhost mysql]#
升级系统表
[root@localhost mysql]# mysql_upgrade -u root -p123456 --socket=/var/lib/mysql/mysql3307.sock --port=3307 --force
mysql_upgrade: [Warning] Using a password on the command line interface can be insecure.
Checking server version.
Running queries to upgrade MySQL server.
Checking system database.
mysql.columns_priv OK
mysql.db OK
mysql.engine_cost OK
mysql.event OK
mysql.func OK
mysql.general_log OK
mysql.gtid_executed OK
mysql.help_category OK
mysql.help_keyword OK
mysql.help_relation OK
mysql.help_topic OK
mysql.innodb_index_stats OK
mysql.innodb_table_stats OK
mysql.ndb_binlog_index OK
mysql.plugin OK
mysql.proc OK
mysql.procs_priv OK
mysql.proxies_priv OK
mysql.server_cost OK
mysql.servers OK
mysql.slave_master_info OK
mysql.slave_relay_log_info OK
mysql.slave_worker_info OK
mysql.slow_log OK
mysql.tables_priv OK
mysql.time_zone OK
mysql.time_zone_leap_second OK
mysql.time_zone_name OK
mysql.time_zone_transition OK
mysql.time_zone_transition_type OK
mysql.user OK
Upgrading the sys schema.
Checking databases.
lottery.mhq OK
sys.sys_config OK
Upgrade process completed successfully.
Checking if update is needed.
[root@localhost mysql]#
简单查询系统表是否存在：
[root@localhost mysql]# find / -name session_variables*
/var/lib/mysql/performance_schema/session_variables.frm
/data/wonhigh/mysql3307/performance_schema/session_variables.frm
[root@localhost mysql]#
重启DB
[root@localhost ~]# date;mysqldump -uroot -pW@h2Gh#2ol5 -A --single-transaction -q -R --set-gtid-purged=OFF > /data/all.sql;date
mysqldump: Couldn't execute 'SHOW VARIABLES LIKE 'ndbinfo\_version'': Native table 'performance_schema'.'session_variables' has the wrong structure (1682) ---->这种需要重启DB才能解决哦~
[root@localhost ~]#
[root@localhost mysql]# /etc/init.d/mysqld restart
停止 mysqld： [确定]
正在启动 mysqld： [确定]
[root@localhost mysql]#
再尝试mysqldump是否成功
[root@localhost mysql]# mysqldump -uroot -p123456 retail_pms BRAND COLOR_INFO SHOP_BRAND ITEM > /root/retail_pms.sql
[root@localhost mysql]#
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