what is the stream property of playlist? for the problems of too many selects, in the playlist mapping set the fetch attribute on the bag node (join or subselect). the outofmemoryexception is unrelated to this (the number of queries impact only the time to retrieve data), try to use a stateless session or session.setreadonly. anyhow i suggest you to use 2 distinct session-transaction to insertand load data to have a test on the real usage
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