In the query process , {TAIL ~ the respective index tables} and {HEAD ~ the identifier table} are used to query whether the target identifier is present in the cache memory at a step  
In the query process , { TAIL ~ the respective index tables } and { HEAD ~ the identifier table } are used to query whether the target identifier is present in the cache memory at a step
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH