Hi hackers, Here is a small patch to add a test exercising SERIALIZABLE READ ONLY DEFERRABLE. It shows a well known example of a serialisation anomaly caused by a read-only transaction under REPEATABLE READ (snapshot isolation), then shows the different ways that SERIALIZABLE and SERIALIZABLE READ ONLY DEFERRABLE avoid the anomaly.
To be able to do this, the patch modifies the isolation tester so that it recognises wait_event SafeSnapshot. -- Thomas Munro http://www.enterprisedb.com
read-only-anomaly-under-si.patch
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