Old MathJax webview

Old MathJax webview

There are 5 transactions T1-T5, and A,B,C,D are data items. Suppose all locks are kept until the transaction is committed. The transactions are implemented in the following below the table order:

main Question is: at time t13, is there a deadlock? Which transactions wait for other transactions?.

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Time Tran Operation Time Tran Operation Time Tran Operation t1 T1 Read A t6 T2 Read D t11 T4 Read B t2 T2 Read B t7 T2 Modify D t12 T4 Modify B t3 T3 Read C t8 T3 Read D t13 t4 T4 Read D t9 T5 Modify A t5 T5 Read A t10 T1 Commit