The cache processing section performs a cache process composed of {TAIL ~ two stage processes}, a query process and {HEAD ~ a subsequent process}  
The cache processing section performs a cache process composed of { TAIL ~ two stage processes } , a query process and { HEAD ~ a subsequent process }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH