graph based protocol

i have watched ur video, in that You told that in graph based protocol ,we can unlock  data in any point but in  one book

by P.S GILL , written that transaction can unlock a node k granted to it only after it has unlocked all the children nodes of k

Pritam Prasun @pritam 6 Jun 2016 07:55 am

I am not aware of this book, I just varified with with Korth (chapter 15, page- 672) which specifies that the "Data items may be unlocked at any time".