Deadlocks, locks held by other sessions and undo that is too old.
ORA-00060
deadlock detected while waiting for resourceTransactions waited on each other in a cycle; Oracle rolled back one statement.
ORA-00054
resource busy (failed to acquire a lock held by another session)A lock needed by DDL, NOWAIT or a lock timeout is held by another session.
ORA-01555
snapshot too oldA long query needed undo that other transactions had already overwritten.
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