Make DB_CLOSE_ON_EXIT safer #3846
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DB_CLOSE_ON_EXITis one of the most popular misused dangerous settings.FALSEfor in-memory databases to avoid registration of shutdown hook. I'm not sure about that, but I think we don't really need to explicitly close any in-memory databases on VM shutdown. Anyway, it is possible to restore this feature withDB_CLOSE_ON_EXIT=TRUE.TRUEas it should, but if it was set toFALSEexplicitly, the shutdown hook is registered anyway and VM shutdown event executes aCHECKPOINTcommand to flush data on disk for more safety.@grandinj