The persistence unit name of this sample is JPASample.
该示例的持久性单元名称为 JPASample。
The threads are maintained in a cached pool of threads per persistence unit.
这些线程根据每个持久性单元保存在线程的缓存池内。
The output of the command is a file consisting of persistence unit name followed by a suffix of .pdqxml.
该命令的输出是一个文件，其名称由持久性单元名称后面跟着后缀 .pdqxml 组成。
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