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the final option here for dealing with deadlocks is whats called deadlock detection and this is in fact with almost every database system implements the basic idea is that were going to create and maintain another kind of graph this is called a waits for graph of transactions that are waiting for other transactions we will periodically check for cycles in this graph and if we see a cycle that cycle is a deadlock so heres an example of constructing awaits for graph transaction t1 gets a shared lock on a transaction t1 gets a shared lock on D then transaction t2 gets an exclusive lock on B transaction t1 gets a shared lock on B so now t1 is waiting for t2 so well put in an edge in the graph that looks like this a directed edge that says t1 is waiting for t2 now III is waiting for a shared lock on D which it can share with t1 so thats fine t3 now wants a shared lock on see what you can get t2 wants an exclusive lock on C which means that t2 is going to be waiting for t3 that holds t
