迁移mysql数据库，遇到的问题，及解决方案

Posted 2022-06-17 阿啄debugIT

1、先测试看数据库的大小

SELECT TABLE_SCHEMA, CONCAT(TRUNCATE(SUM(data_length)/1024/1024,2),' MB') AS data_size,
CONCAT(TRUNCATE(SUM(index_length)/1024/1024,2),'MB') AS index_size
FROM information_schema.tables
GROUP BY TABLE_SCHEMA
ORDER BY data_length desc;

发现数据库，并不大！

2、先导出原来的数据库数据结构及数据

mysqldump -h localhost -uroot -p123456  database  > dump.sql

3、导入本地的数据库，报错

MySQL server has gone away，或者“Variable 'time_zone' can't be set to the value of 'NULL'”

mysql> show global variables like 'max_allowed_packet';
+--------------------+----------+
| Variable_name      | Value    |
+--------------------+----------+
| max_allowed_packet | 16777216 |
+--------------------+----------+
1 row in set (0.04 sec)

mysql> set global max_allowed_packet=1024*1024*160;
Query OK, 0 rows affected (0.00 sec)

mysql> show global variables like 'max_allowed_packet';
+--------------------+-----------+
| Variable_name      | Value     |
+--------------------+-----------+
| max_allowed_packet | 167772160 |
+--------------------+-----------+
1 row in set (0.05 sec)

4、导入成功！