如下是从论坛上的下载的AWR报告，里面的Immed的时间为何会比busy时间长呢
Global Cache Transfer Times (ms)
Avg Time - average time of all blocks (Immed,Busy,Congst) in ms
Immed, Busy, Congst - Average times in ms
ordered by CR + Current Blocks Received desc
CR Avg Time (ms) Current Avg Time (ms)
Inst No Block Class All Immed Busy Congst All Immed Busy Congst
2 data block 4.52 4.39 7.17 0.73 1.34 1.32 9.94 1.59
2 others 14.45 14.52 8.08 0.62 1.08 1.07 3.43 1.67
2 undo header 0.64 0.59 4.53 0.51 0.74 0.57 5.47
2 undo block 27.79 28.20 1.46