mysql 5.6 升级 mysql 5.7
mysql升级是个老生常谈的话题，不多说，主要记录mysql_update升级方式，以备给新手点借鉴
(一)注意点
1、磁盘空间是否充足，满足本机主从搭建；
2、mysql5.6中my.cnf的部分参数不在适用于5.7；
3、升级方式的选择
对于较小的库，利用mysqldump来直接导出sql文件，然后导入到新库中；
(二)升级步骤（mysql_update方式）
1、备份数据库，且备份恢复验证xtrabackup这里不详细记录
2、关闭当前5.6数据库实例
在关闭的时候刷新脏块
SET GLOBAL innodb_fast_shutdown=0
./mysql_start_5.6.sh 3308 stop
3、base目录修改为5.7对应
修改my.cnf /data/server/mysql5.7-17
4、mysql_upgrade执行
/data/server/mysql5.7-17/bin/mysql_upgrade--defaults-file=/data/dbdata/my.cnf5.7 -h127.0.0.1 -uroot -p -P3308
(三)操作记录（10.88.100.15为例）
1、登陆并执行
SETGLOBAL innodb_fast_shutdown=0
2、停库 ./mysql_start.sh 3309 stop
3、下载5.7.17二进制包
下载 mysql-5.7.17-linux-glibc2.5-x86_64.tar.gz
tar–zxvf mysql-5.7.17-linux-glibc2.5-x86_64.tar.gz
mv mysql-5.7.17-linux-glibc2.5-x86_64mysql-5.7.17
4、备份
备份数据文件、redolog、共享表空间等
5、修改my.cnf
Basedir修改为/server/mysql-5.7.17
修改my.cnf中的innodb_use_sys_malloc=1 去掉
6、启动
/data-2/server/mysql-5.7.17/bin/mysqld_safe--defaults-file=/data-2/dbdata/data_3309/my.cnf --port=3309 --user=mysql>/dev/null 2>&1 &
6、升级数据文件
/data-2/server/mysql-5.7.17/bin/mysql_upgrade--defaults-file=/data-2/dbdata/data_3309/my.cnf -h127.0.0.1 -uJRJ_YongChao -p-P3309
7、关闭数据库
/data-2/server/mysql-5.7.17/bin/mysqladmin-h127.0.0.1 -P3309 -uJRJ_YongChao -p shutdown
8、修改mysql_start.sh 中mysqlbase基本目录为5.7.17 并启动
字符串替换
:1,$s/mysql-5.6.22/mysql-5.7.17/g
启动数据库
./mysql_start_5.7.sh3309 start
升级完成
(四)参考文档（官方文档-升级部分）
1. Review the changesdescribed in Section 2.11.1.1, “ChangesAffecting Upgrades to MySQL 5.7” for steps to be performed beforeupgrading.
2. Configure MySQL toperform a slow shutdown by setting innodb_fast_shutdown to 0. For example:
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mysql -u root -p --execute="SET GLOBALinnodb_fast_shutdown=0"
With a slowshutdown, InnoDB performs a full purge and change buffer merge beforeshutting down, which ensures that data files are fully prepared in case of fileformat differences between releases.
3. Shut down the oldMySQL server. For example:
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mysqladmin -u root -p shutdown
4. Upgrade the MySQLbinaries or packages in place (replace the old binaries or packages with thenew ones).
Note
Forsupported Linux distributions, the preferred method for replacing the MySQLpackages is to use the MySQL software repositories; see Section 2.11.1.2, “UpgradingMySQL with the MySQL Yum Repository”, Section 2.11.1.3, “UpgradingMySQL with the MySQL APT Repository”, or UpgradingMySQL with the MySQL SLES Repository for instructions.
5. Start the MySQL 5.7server, using the existing data directory. For example:
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mysqld_safe --user=mysql --datadir=/path/to/existing-datadir
6. Run mysql_upgrade. For example:
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mysql_upgrade -u root -p
mysql_upgrade examines all tables in all databases forincompatibilities with the current version of MySQL. mysql_upgrade also upgrades the mysql system database so that you can takeadvantage of new privileges or capabilities.
Note
mysql_upgrade should not be used when the server is running with --gtid-mode=ON. See GTIDmode and mysql_upgrade for more information.
mysql_upgrade does not upgrade the contents of the help tables. Forupgrade instructions, see Section 5.1.10,“Server-Side Help”.
7. Shut down andrestart the MySQL server to ensure that any changes made to the system tablestake effect. For example:
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mysqladmin -u root -p shutdown
mysqld_safe --user=mysql --datadir=/path/to/existing-datadir