【MySQL运维】MySQL5.1升级到MySQ5.5实战

之前公司大部分项目都上了5.5版本，手上刚好有个项目(自由交易平台)数据量不是很大，单台服务器在线上跑得比较稳定，很少去搭理，为了统一版本于是打算升级到MyS

#注释掉default_table_type = MyISAM 在5.5里已经不识别了

#注释掉myisam_max_extra_sort_file_size 在5.5里已经不识别了

#innodb_file_io_threads已经不识别了，改成

innodb_read_io_threads = 8

innodb_write_io_threads = 8

# 提高刷新脏页数量和合并插入数量，改善磁盘IO处理能力，根据自己的磁盘IOPS能力调整

innodb_io_capacity = 2000

# 把以前的built-in文件格式Antelope改为Barracuda

innodb_file_format = Barracuda

# 脏页的调整，从以前的25改为90，这个值可在70--90之间选取

innodb_max_dirty_pages_pct = 90

# 事务日志redo log的调整，从以前的256M改为1024M

innodb_log_file_size = 1024

# 采用独立表空间

innodb_file_per_table = 1

重启MySQL服务生效：

[root@db_fb05 mysql-5.1.62]# service mysqld restart

Shutting down MySQL. SUCCESS!

Starting MySQL.. SUCCESS!

[root@db_fb05 mysql-5.1.62]#

二、升级具体步骤

升级前有一个重要参数需要注意：innodb_fast_shutdown

升级前要关闭这个功能(为什么要关请参考手册)：

(root:opdba.com:Sat Dec 1 18:14:48 2012)[(none)]> show variables like '%fast%';

+----------------------+-------+

| Variable_name | Value |

+----------------------+-------+

| innodb_fast_shutdown | 1 |

+----------------------+-------+

1 row in set (0.00 sec)

(root:opdba.com:Sat Dec 1 18:35:20 2012)[(none)]> set global innodb_fast_shutdown=0;

Query OK, 0 rows affected (0.00 sec)

(root:opdba.com:Sat Dec 1 18:35:43 2012)[(none)]> show variables like '%fast%';

+----------------------+-------+

| Variable_name | Value |

+----------------------+-------+

| innodb_fast_shutdown | 0 |

+----------------------+-------+

1 row in set (0.00 sec)

1.停止当前MySQL服务

service mysqld stop

2.链接到新MySQL目录

cd /opt/webserver/

unlink mysql

ln -sv mysql-5.5.34-linux2.6-x86_64 mysql

3.启动服务

service mysqld start

4.执行更新程序升级

/opt/webserver/mysql/bin/mysql_upgrade

Looking for 'mysql' as: /opt/webserver/mysql/bin/mysql

Looking for 'mysqlcheck' as: /opt/webserver/mysql/bin/mysqlcheck

Running 'mysqlcheck' with connection arguments: '--port=3306' '--socket=/data/mysql/mysql.sock'

/opt/webserver/mysql/bin/mysqlcheck: Got error: 2002: Can't connect to local MySQL server through socket '/data/mysql/mysql.sock' (111) when trying to connect

FATAL ERROR: Upgrade failed

出现上面错误是由于当前MySQL服务器的root用户设置了密码，mysql_upgrade 加上-p参数批量root用户密码即可：

/opt/webserver/mysql/bin/mysql_upgrade -padmin

Looking for 'mysql' as: /opt/webserver/mysql/bin/mysql

Looking for 'mysqlcheck' as: /opt/webserver/mysql/bin/mysqlcheck

Running 'mysqlcheck' with connection arguments: '--port=3306' '--socket=/data/mysql/mysql.sock'

Running 'mysqlcheck' with connection arguments: '--port=3306' '--socket=/data/mysql/mysql.sock'

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.host OK

mysql.ndb_binlog_index OK

mysql.plugin OK

mysql.proc OK

mysql.procs_priv OK

mysql.proxies_priv OK

mysql.servers 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'...

OK

出现上面信息就说明升级OK！

查看下当前的版本：

[root@db_fb010 ~]# /opt/webserver/mysql/bin/mysql -V

Logging to file '/data/mysql/logs/query.log'

/opt/webserver/mysql/bin/mysql Ver 14.14 Distrib 5.5.34, for linux2.6 (x86_64) using readline 5.1

mysql_upgrade命令实际执行了以下操作：

mysqlcheck --all-databases --check-upgrade --auto-repair

mysql

mysqlcheck --all-databases --check-upgrade --fix-db-names --fix-table-names

5.存储过程问题修复

从5.1升级至5.5后，发现存储过程不能用的，创建存储过程和查看存储过程状态，会报如下错：

(root:opdba.com:Sat Dec 1 18:14:48 2012)[(none)]> show procedure status;
ERROR 1548 (HY000): Cannot load from mysql.proc. The table is probably corrupted

通过上述报错，，立马查看两边表 proc 的状态发现：show create table proc\G------>

在5.1中mysql.proc表的comment字段是char(64)：