轮询

• Polling , time - sharing
  共时轮询
• Polling , line - shared
  共线轮询
• Specifies the interval , in seconds , between polls of the event table by the report server
  指定报表服务器轮询事件表的间隔（秒） 。
• Polls the relay in a loop until it receives this message indicating success
  在中继上反复轮询直到它接收到该消息，表明成功了为止。
• The polling interval should be short , once a minute , as compared to method 1
  轮询。与方法1相比，轮询间隔应该更短（每分钟一次） 。
• Table - based polling is not recommended for tables that have many frequent changes
  建议不要将基于表的轮询用于具有许多频繁更改的表。
• There are two approaches to synchronization , polling and using synchronization objects
  有两种方法可以实现同步，轮询和使用同步对象。
• The status of the transaction is unknown , because some participants must still be polled
  事务的状态未知，因为仍必须轮询一些参与者。