虚拟内存段还包含字典缓存器，存储过程缓存器，以及在向磁盘一次性写入大块页面时使用到的较大的缓冲池。
Virtual segment also contains dictionary cache, stored procedures cache, and big buffer pools used for writing large block of pages to disk at once.
VM初始化过程用一小组跟踪点启动跟踪，这些跟踪点被捕捉到回绕式存储内缓冲区中。
VM initialization starts trace with a small set of trace points that are captured to wrap around in-storage buffers.
如果存储过程被注册为FENCED，那么数据库管理器就禁止过程访问它的内部资源(比如数据缓冲区)。
If a stored procedure is registered as FENCED, the database manager protects its internal resources (for example, data buffers) from access by the procedure.
应用推荐