Kennethvr Kennethvr - 2 months ago 13
MySQL Question

MySQL console slow on import of huge SQL files

My import of SQL via the MySQL console is rather slow, and, as our SQL file is increasing every day, I would like to know if there are any alternatives on how to import an SQL file faster.

Changing to Oracle or other systems is not an option, the configuration has to stay the same.

Currently the SQL file is: 1.5 GB.
I'm on WAMP with Apache 2.2.14, PHP 5.2.11 and MySQL 5.1.41.

Perhaps the issue is here, import is done by a simple:

mysql -u username -p dbname < sqlfilename.sql


Any suggestions?

Answer

Having indexes enabled during import will slow your server down to a crawl. ALTER TABLEtablenameDISABLE KEYS; and using ..ENABLE KEYS prior to and after import, will improve import speed, but will take some time to re-create indexes, so it might not be a big speed gain after all.

Also, perhaps using myisam tables (in contrast to innodb with referential integrity options) usually gives better performance, as there is no referential integrity overhead involved.

Personally, I don't use import statement from mysql console, but import sql files using mysql -uUSER -pPASS DBNAME < file.sql, and it works well for me.

Hope it helps.

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