00:01
S is a shared read lock, x is exclusive right lock.
00:06
Conflicts occur when there's different transactions, when there's same data item or at least one operation is right.
00:15
And so let's go through our options here, 21 to t2.
00:18
T1 holds s -a, t -2 wants x f -a later, which is a conflict.
00:27
So that is correct, t -1 to t -2.
00:29
T -3 to t -1.
00:30
Let's see, t3, x, t1 does not touch c, so there's no conflict on c.
00:38
T3, t3 does not touch a, or b.
00:40
Actually, t3, s, c, and rc, t1 doesn't touch c.
00:46
Well, well, i think that t3 to t1, i think that is okay...