for the main file:
blocking factor =(1000/100)=10
no. of blocks in main = (10000/10)=1000
for index file:
blocking factor=(1000/(12+8))=50
1.sparse index
no. of records =1000
no. of blocks in sparse indexing= (1000/50)=20
2.dense index
no. of records=10000
no .of blocks in dense indexing =(10000/50)=200