Give serially equivalent interleaving of T and U with the following properties:
(i) that is strict;
(ii) that is not strict but could not produce cascading aborts;
(iii) that could produce cascading aborts.
For strict executions, the reads and writes of a transaction are delayed until all transactions that have previously written the same objects are either committed or aborted. We therefore indicate the commit of the earlier transaction:
ii) For serially equivalent executions that are not strict but cannot produce cascading aborts, there must be no dirty reads, which requires that the reads of a transaction are delayed until all transactions that have previously written the same objects are either committed or aborted (we can allow writes to overlap).
iii) For serially equivalent executions that can produce cascading aborts, that is, dirty reads are allowed. Taking A and adding a commit immediately after the last operation of U, we get:
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