项目目的

将原来windows环境中使用phpstudy搭建的mysql 5.5.53 中的数据迁移至新主机Linux环境中

环境情况

新主机

系统平台：

CentOS release 7.4 (Final)             内核  3.10.0-693.el7.x86_64

mysql环境：

mysql> status

Server version:     5.6.39-log MySQL Community Server (GPL)

Server characterset:    utf8

Db     characterset:    utf8

Client characterset:    utf8

Conn.  characterset:    utf8

mysql> show variables like '%storage_engine%';

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

| Variable_name              | Value  |

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

| default_storage_engine     | InnoDB |

| default_tmp_storage_engine | InnoDB |

| storage_engine             | InnoDB |

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

旧主机：

系统平台：

Windows 2012 R2 SE X64

mysql环境：

Server version:         5.5.53 MySQL Community Server (GPL)

Server characterset:    utf8

Db     characterset:    utf8

Client characterset:    utf8

Conn.  characterset:    utf8

mysql> show variables like '%storage_engine%';

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

| Variable_name          | Value  |

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

| default_storage_engine | MyISAM |

| storage_engine         | MyISAM |

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

表的存储引擎

mysql> show table status from database\G;

Engine: InnoDB

Engine: MyISAM

迁移过程

1.使用phpstudy自带的工具进行每个数据库导出

image

我看了，也是用的mysqldump操作的。

2.如果只是保留原本的表引擎，那么直接以下操作即可

mysql> create database zentao;

mysql> use zentao;

mysql> source zentao20180413161534.sql;

mysql> show tables;

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

| Tables_in_zentao  |

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

| zt_action         |

| zt_bug            |

| zt_build          |

...

原表引擎保持原样。

mysql> show table status from zentao\G;

*************************** 1. row ***************************

Name: zt_action

Engine: MyISAM

Version: 10

Row_format: Dynamic

3.将原有数据库中的表引擎变更为InnoDB

在导出的表结构zentao.sql中找到ENGINE=MyISAM,修改成ENGINE=InnoDB,至于你用什么方法替换，看你喜欢了。

# vim zentao.sql

:%s/ENGINE=MyISAM/ENGINE=InnoDB/g

4.导入数据到指定数据库

mysql> use zentao;

mysql> source zentao.sql;

表引擎变更为InnoDB

mysql> show table status from zentao\G;

*************************** 1. row ***************************

Name: zt_action

Engine: InnoDB

Version: 10

Row_format: Compact

5.但是有一个问题，查看表的详细信息时发现Data_free不为零，说明存在数据碎片，需要进行优化

mysql> select table_schema, table_name, data_free, engine from information_schema.tables where table_schema not in ('information_schema', 'mysql') and data_free != 0;

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

| table_schema | table_name | data_free | engine |

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

| zentao       | zt_bug     |   4194304 | InnoDB |

| zentao       | zt_history |   4194304 | InnoDB |

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

6.整理有碎片的表

mysql> use zentao;

mysql> optimize table zt_bug,zt_history;

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

| Table             | Op       | Msg_type | Msg_text                                                          |

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

| zentao.zt_bug     | optimize | note     | Table does not support optimize, doing recreate + analyze instead |

| zentao.zt_bug     | optimize | status   | OK                                                                |

| zentao.zt_history | optimize | note     | Table does not support optimize, doing recreate + analyze instead |

| zentao.zt_history | optimize | status   | OK                                                                |

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

提示该表不支持 optimize,但是下边有显示OK.其实已经执行成功了。5.6.X的版本，其实已经支持Innodb了

mysql> select table_name,engine,table_rows,data_length+index_length length,DATA_FREE from information_schema.tables where TABLE_SCHEMA='zentao' and data_free =0;

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

| table_name        | engine | table_rows | length  | DATA_FREE |

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

| zt_bug            | InnoDB |       1018 | 1589248 |         0 |

| zt_history        | InnoDB |       2584 | 1589248 |         0 |

多个数据库方法同样操作即可。