分块导入 sql 数据

Question

I have a large size of sql file. I have to import data but when i import only 10-20 records then inserting data in database correctly but when i tried with whole file then having no data in database. May be there is some data issue So I want to insert data in chunks but could not find any right solutions. Is their any another possible solution?

Thanks in advance

Answer 1

As explain Henning Koch in this card the best way to import a dump safely is

mysql -uroot -p --default-character-set=utf8mb4 database
mysql> SET names 'utf8'
mysql> SOURCE utf8.dump

And as Henning says

Note that when your MySQL server is not set to UTF-8 you need to do mysqldump --default-character-set=latin1 (.) to get a correctly encoded dump, In that case you will also need to remove the SET NAMES='latin1' comment at the top of the dump. so the target machine won't change its UTF-8 charset when sourcing.

Is important check the server configuration because you can get corrupted data if the charsets no match. In this post Mathias explain how to get full support for unicode on mysql. The important part in this post for you is the way to check the server configuration

mysql> SHOW VARIABLES WHERE Variable_name LIKE 'character\_set\_%' OR Variable_name LIKE 'collation%';
+--------------------------+--------------------+
| Variable_name            | Value              |
+--------------------------+--------------------+
| character_set_client     | utf8mb4            |
| character_set_connection | utf8mb4            |
| character_set_database   | utf8mb4            |
| character_set_filesystem | binary             |
| character_set_results    | utf8mb4            |
| character_set_server     | utf8mb4            |
| character_set_system     | utf8               |
| collation_connection     | utf8mb4_unicode_ci |
| collation_database       | utf8mb4_unicode_ci |
| collation_server         | utf8mb4_unicode_ci |
+--------------------------+--------------------+
10 rows in set (0.00 sec)

You must use the right charsets for you case. Check too if you target server was configured properly.

If you need modify the server configuration go to /etc/my.cnf, or if you use windows go to the server installation directory (ex. C:\Program Files\MySQL\MySQL Server 5.6) and locate the my.ini file. If the file not exists copy my-default.ini into my.ini

By Mathias

[client]
default-character-set = utf8mb4

[mysql]
default-character-set = utf8mb4

[mysqld]
character-set-client-handshake = FALSE
character-set-server = utf8mb4
collation-server = utf8mb4_unicode_ci