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Oracle can trigger deadlocks (ORA-00060) using the classic cross-update pattern. Unlike PostgreSQL/SQL Server which roll back the victim's entire transaction, Oracle only rolls back the victim's statement. This requires using Task.WhenAny instead of Task.WhenAll, then explicitly rolling back the victim's transaction to release earlier locks and unblock the other session. https://claude.ai/code/session_01WusLPsCyEsDpSbp2Nm6Tkx
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Deadlock test for Oracle