将phpstudy中的mysql迁移至Linux教程

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。