java用户事务|实体管理器刷新|事务超时|数百万条记录

Question

以下是以开头的代码：

@Schedule(hour = "*", minute = "*/1", persistent = false)
@TransactionTimeout(value = 10, unit = TimeUnit.HOURS)
public void triggerExtraJob() {

-------------------
@TransactionManagement(value=TransactionManagementType.BEAN)
public class CustomerTeamsJmsServiceImpl { 
   private void persist(List<TerpCrtV> terpCustomerTeams) throws Exception  {
    userTransaction.begin();
    masterdataPersistance.persist(terpCustomerTeams);
    userTransaction.commit();
  }

------------
 entityManagerMaster.merge(tch); <-- It works fine for 5000 records but suddenly 300 000 record appears and 
                                     it execute update statements but not able to save in db
 entityManagerMaster.flush(); <--- I added only this after merge

这是修复此问题或TransactionTimeout或TransactionManagementBean中所需的任何更改的正确方法

flush是否会显示数据库中的数据，或者是否需要清除（）以进行相同的操作