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

$ time bash llil_sql_imp2 hash2.db big1.txt big2.txt big3.txt
Importing big1.txt
Importing big2.txt
Importing big3.txt

real  0m4.350s
user  0m4.298s
sys   0m0.049s

$ time bash llil_sql_qry2 hash2.db >out.txt

real  0m9.668s
user  0m9.537s
sys   0m0.122s

$ ls -lh hash2.db 
-rw-r--r-- 1 mario mario 160M Feb  7 22:57 hash2.db