BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select n_name, sum(l_extendedprice * (1 - l_discount)) as revenue from customer, orders, lineitem, supplier, nation, region where c_custkey = o_custkey and l_orderkey = o_orderkey and l_suppkey = s_suppkey and c_nationkey = s_nationkey and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'ASIA' and o_orderdate >= date '1997-01-01' and o_orderdate < date '1997-01-01' + interval '1 year' group by n_name order by revenue desc; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2427674.29..2427674.35 rows=25 width=34) (actual time=107467.550..107467.551 rows=5 loops=1) Sort Key: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount)))) Sort Method: quicksort Memory: 25kB Buffers: shared hit=1260530 read=216733 dirtied=254 written=964 -> HashAggregate (cost=2427673.46..2427673.71 rows=25 width=34) (actual time=107467.458..107467.462 rows=5 loops=1) Buffers: shared hit=1260527 read=216733 dirtied=254 written=964 -> Hash Join (cost=399935.21..2426937.99 rows=73547 width=34) (actual time=20292.661..107212.075 rows=73650 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (customer.c_nationkey = supplier.s_nationkey)) Buffers: shared hit=1260527 read=216733 dirtied=254 written=964 -> Hash Join (cost=395256.21..2384738.92 rows=1839230 width=46) (actual time=20148.065..102465.413 rows=1823174 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=1259208 read=215870 dirtied=254 written=584 -> Seq Scan on lineitem (cost=0.00..1670262.94 rows=60165494 width=16) (actual time=0.055..33909.000 rows=60045379 loops=1) Buffers: shared hit=866532 read=202076 written=1 -> Hash (cost=389507.25..389507.25 rows=459917 width=38) (actual time=20147.379..20147.379 rows=456043 loops=1) Buckets: 65536 Batches: 1 Memory Usage: 32066kB Buffers: shared hit=392676 read=13794 dirtied=254 written=583 -> Hash Join (cost=87762.86..389507.25 rows=459917 width=38) (actual time=5447.233..19737.272 rows=456043 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=392676 read=13794 dirtied=254 written=583 -> Bitmap Heap Scan on orders (cost=48720.64..337242.42 rows=2299585 width=8) (actual time=2375.747..8926.689 rows=2277833 loops=1) Recheck Cond: ((o_orderdate >= '1997-01-01'::date) AND (o_orderdate < '1998-01-01 00:00:00'::timestamp without time zone)) Buffers: shared hit=248282 read=11949 dirtied=254 written=84 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..48145.75 rows=2299585 width=0) (actual time=2106.564..2106.564 rows=2282427 loops=1) Index Cond: ((o_orderdate >= '1997-01-01'::date) AND (o_orderdate < '1998-01-01 00:00:00'::timestamp without time zone)) Buffers: shared hit=360 read=5861 written=70 -> Hash (cost=35292.22..35292.22 rows=300000 width=38) (actual time=3070.505..3070.505 rows=300270 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 21113kB Buffers: shared hit=144394 read=1845 written=499 -> Nested Loop (cost=905.09..35292.22 rows=300000 width=38) (actual time=34.335..2520.544 rows=300270 loops=1) Buffers: shared hit=144394 read=1845 written=499 -> Nested Loop (cost=0.00..14.07 rows=5 width=30) (actual time=0.073..0.195 rows=5 loops=1) Join Filter: (nation.n_regionkey = region.r_regionkey) Rows Removed by Join Filter: 20 Buffers: shared hit=3 -> Index Scan using pk_nation on nation (cost=0.00..12.63 rows=25 width=34) (actual time=0.014..0.066 rows=25 loops=1) Buffers: shared hit=2 -> Materialize (cost=0.00..1.07 rows=1 width=4) (actual time=0.002..0.003 rows=1 loops=25) Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.026..0.027 rows=1 loops=1) Filter: (r_name = 'ASIA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=41.411..478.732 rows=60054 loops=5) Recheck Cond: (c_nationkey = nation.n_nationkey) Buffers: shared hit=144391 read=1845 written=499 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=31.568..31.568 rows=60054 loops=5) Index Cond: (c_nationkey = nation.n_nationkey) Buffers: shared hit=5 read=831 written=233 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=144.103..144.103 rows=100000 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 3907kB Buffers: shared hit=1316 read=863 written=380 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=8) (actual time=0.030..96.915 rows=100000 loops=1) Buffers: shared hit=1316 read=863 written=380 Total runtime: 107489.541 ms (55 rows) COMMIT; COMMIT