Why does TRANSACTION / COMMIT improve performance so much with PHP/MySQL (InnoDB)?

Question

I\'ve been working with importing large CSV files of data; usually less than 100,000 records. I\'m working with PHP and MySQL (InnoDB tables). I needed to use PHP to transform s

Answer 1

1. Please check this link:

   https://dev.mysql.com/doc/refman/5.5/en/optimizing-innodb-transaction-management.html

   InnoDB must flush the log to disk at each transaction commit if that transaction made modifications to the database. When each change is followed by a commit (as with the default autocommit setting), the I/O throughput of the storage device puts a cap on the number of potential operations per second.

2. Big transactions may affect performance during commit (check above)

3. Only in case of rollback, however it may be optimized using some settings (check the link)