I have been doing a few exercises for an exam, they dont come with answers so just looking clarification, it asks to find the errors in the table and to explain each error which 2PL principles it violates.
I have came up with T4 at Step 14 cannot work as T1 has not released the lock it holds.
T4 at step 15 and 16 as T1 as it doesnt have the lock.
T4 at step 5 开发者_StackOverflow中文版and 6 as T2 hasn't released the lock.
Is this correct
Thanks
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