对于数据库持久性，是应该使用单行模式，还是多行模式？
Should I use a single row or multi-row schema with database persistence?
不过，多行模式的性能可能相对较差，因为从会话收集属性可能会导致进行多次查询。
However, the resulting performance can be worse with a multi-row schema, since gathering attributes out of the session might cause multiple queries.
具体地说，必须使用——name命名每个pv实例，还必须使用——cursor启用多行模式。
Specifically, you must name each instance of pv using — name, and you must enable multiline mode with — cursor.
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