Google voi cum tu nay

http://stackoverflow.com/questions/10871705/grails-transaction-issues

http://desmontandojava.blogspot.co.uk/2013/08/grails-pitfalls-dont-do-flushtrue-when.html

http://www.anyware.co.uk/2005/2012/11/12/the-false-optimism-of-gorm-and-hibernate/

http://naleid.com/blog/2009/10/01/batch-import-performance-with-grails-and-mysql/

http://rpeszek.blogspot.co.uk/2014/08/i-dont-like-hibernategrails-part-5-auto.html

http://grails.asia/improving-performance-of-large-batch-insert

https://www.catalysts.cc/en/diskussion/grails-in-large-projects-part-2/

http://www.slideshare.net/SpringCentral/transactions-30148247

http://www.tothenew.com/blog/grails-transactions-using-transactional-annotations-and-propagation-requires_new/