Whats the difference between dirty checking vs dynamic-update hibernate.

I know that dirty checking will update/sync data with db whenever a change is done.
And dynamic-update will update the db only with modified values.

But both are doing the same thing ..right?? Updating the modified values.. Can you please specify why we need this two. One is enough..right??

I've had the same question, after some research i found out the following

if you have list of objects, and you are trying to update this to the DB, only few have been changed, if you update this to the db, only those which are modified are updated. this is automatic dirty checking.

Dynamic update is when you have only a few columns updated in a object. hibernate will updaate the update query and save the date into the db, but this has some performance issues, unless you are updating into a bigdata.