contestada

consider the following sequence of records present in an undo/redo log: (start, s); (s, a, 10, 20); (start t); (commit s); (t, b, 5,15); (start u); (t, a, 20, 30); (commit t); (u, b, 15, 25); (u, a, 30, 40).
Suppose that we begin a nonquiescent checkpoint immediately after one of the following log records has been written (in memory):
(a) (b) (c) (d) (e) < T ,E , 50>

Respuesta :

If the crash happens after, we know that every transaction that was committed before the checkpoint began has been recorded on the disc.

. => The can be written anywhere after the for undo/redo logging.

=> The record shows that all transactions that were committed before the checkpoint's commencement are written to disc, including those that were "dirty," or updated in the buffer but not yet recorded to disc.

=> The manner in which the database components are saved to the disc has no bearing on this activity.

=> As a result, it might show up later wherever.

I The can be written anywhere after the for undo/redo logging.

=> The CKPT> record shows that any transactions that were committed before the checkpoint are "dirty," meaning they have changed in the buffer but have not yet been sent to the disc.

=> The manner in which the database components are saved to the disc has no bearing on this activity.

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