Bitmap Heap Scan on type_tbl (cost=75.42..1595.19 rows=1034 width=12) (actual time=0.604..1.341 rows=1001 loops=1) Recheck Cond: ((num >= 1000) AND (num <= 2000) AND (type = 'b'::bpchar)) Heap Blocks: exact=7Buffers: shared hit=18-> Bitmap Index Scan on ...