Checkpointing would enable {HEAD ~ the relational database system} to implement {TAIL ~ restartable queries}, and thus database performance is increased 
to implement
Checkpointing would enable { HEAD ~ the relational database system } to implement { TAIL ~ restartable queries } , and thus database performance is increased
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH