The portlet implementation needs to make sure that there is proper backend access and cacheupdate handling if the cache does not return the data when queried with a certain key.
When a program writes to memory, the processor only modifies the line in the cache, but does not update main memory.
当一个程序写入存储，处理器仅仅只会修改缓存线，而不会更新主要的存储内容。
3
By clearing the session cache before DML update, we cut the time to about 4 minutes, all of which is needed by the data loading into the session cache.