Due to the design of the application server, JMS connections can be closed because the Aged timeout has elapsed, even if JMS sessions created from that connection are involved in a transaction.
由于应用服务器设计的原因，JMS连接可能会因为超过过时超时而关闭，即使从该连接创建的JMS会话涉及一个事务也是如此。
These lightweight sessions reduce the network overhead of creating separate network connections from the middle tier to the database.
这些轻量级会话减少了创建中间层与数据库的连接所带来的开销。
For example, default pool sizes of 10 mean that, at most, there will be ten connections each with a pool of ten sessions, giving 100 sessions in total.
例如，缺省池大小为10表示每个池中最多有10个连接，每个连接有10个会话，总共有100个会话。
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