Hibernate : dynamic-update dynamic-insert - Performance Effects

Question

Using dynamic-update or dynamic-insert has positive, though generally slight only on performance, as also mentioned by http://www.mkyong.com/hibernate/hibernate-dynamic-upda

Answer 1

The other reason is when updating a previously detached object. For that to work the record first needs to be fetched from the db, as a detached object isn't in the session cache. Hence dynamic update in this case requires an extra round trip to perform the initial fetch.