$ wc -l big1.txt big2.txt big3.txt 
 3515200 big1.txt
 3515200 big2.txt
 3515200 big3.txt
10545600 total

$ time bash llil_sql_imp1 hash1.db big1.txt big2.txt big3.txt
Importing big1.txt
Importing big2.txt
Importing big3.txt

real  0m12.913s
user  0m12.701s
sys   0m0.197s

$ time bash llil_sql_qry1 hash1.db >out.txt

real  0m6.297s
user  0m6.157s
sys   0m0.158s

$ ls -lh hash1.db 
-rw-r--r-- 1 mario mario 330M Feb  7 22:55 hash1.db