假設原來是mysql 5.6.19社區版，現在要升級到percona server 5.6.30。

對于大的數據庫來說，采用mysqldump方式進行遷移太花費時間了，可采用新安裝加載原來數據庫的方式大大節約升級時間。

對于mysql升級來說，一個主要的步驟就是升級后權限的同步更新以及數據表的校驗。

假設原來為/usr/local/mysql->?mysql-5.6.19-linux-glibc2.5-x86_64，數據庫在data目錄下。

0、停止現有實例，/usr/local/mysql/bin/mysqladmin -u -p shutdown?

1、首先，刪除原來的符號鏈接rm rf /usr/local/mysql；

2、解壓Percona-Server-5.6.30-rel76.3-Linux.x86_64.ssl101.tar.gz到當前目錄；

3、創建新的符號鏈接ln -s Percona-Server-5.6.30-rel76.3-Linux.x86_64.ssl101?mysql

4、更改my.cnf，去掉datadir、basedir注釋，如下：

??? basedir = /usr/local/mysql?#指向最新的mysql實例

??? datadir = /usr/local/mysql-5.6.19-linux-glibc2.5-x86_64/data?指向原來的mysql數據庫目錄

????其他配置可以保持不變。。。

5、使用新的安裝包創建啟動mysql實例：/usr/local/mysql/bin/mysqld_safe --user=mysql &

6、執行mysql_upgrade

[root@localhost bin]# ./mysql_upgrade -uroot -p
Warning: Using a password on the command line interface can be insecure.
Looking for 'mysql' as: ./mysql
Looking for 'mysqlcheck' as: ./mysqlcheck
Running 'mysqlcheck with default connection arguments
Warning: Using a password on the command line interface can be insecure.
Running 'mysqlcheck with default connection arguments
Warning: Using a password on the command line interface can be insecure.
mysql.columns_priv???????????????????????????????? OK
mysql.db?????????????????????????????????????????? OK
mysql.event??????????????????????????????????????? OK
mysql.func???????????????????????????????????????? OK
mysql.general_log????????????????????????????????? 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.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
Running 'mysql_fix_privilege_tables'...
Warning: Using a password on the command line interface can be insecure.
Running 'mysqlcheck with default connection arguments
Warning: Using a password on the command line interface can be insecure.
Running 'mysqlcheck with default connection arguments
Warning: Using a password on the command line interface can be insecure.
mig_db.mig_tab???????????????????????????????????? OK
mig_db.mig_tab2??????????????????????????????????? OK
OK

7、重啟mysql實例。

8、客戶端驗證，可發現所有數據和存儲過程均正常。

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