Consider the recovery aspects of the nested transactions . Assume that a withdraw transaction will abort if the account will be overdrawn and that in this case the parent transaction will also abort. Describe serially equivalent interleavings of T1, T2, U1 and U2 with the following properties:

What will be an ideal response?

If a child transaction’s abort can cause the parent to abort, with the effect that the other children abort, then strict executions must delay reads and writes until all the relations (siblings and ancestors) of transactions that have previously written the same objects are either committed or aborted. Our deposit and withdraw operations read and then write the balances.