这个参数决定缓冲池中脏页的阈值百分比，当脏页达到这个百分比时，就会启动页清除。
This parameter determines the threshold percentage of dirty pages in the buffer pool at which page cleaning will be initiated.
收集选项包括打开或关闭跟踪；指定跟踪缓冲区大小；指定或更改跟踪选项；转储跟踪信息；以及清除跟踪缓冲区。
Collection options include turning a trace on or off; specifying the trace buffer size; specifying or changing trace options; dumping a trace; and clearing the trace buffer.
在数据库代理程序需要缓冲池中的空间之前，这些页清除程序将缓冲池中已更改的页写到磁盘。
These page cleaners write changed pages from the buffer pool to disk before the space in the buffer pool is required by a database agent.
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