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 '1996-01-01' and o_orderdate < date '1996-01-01' + interval '1 year' group by n_name order by revenue desc; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2456727.67..2456727.73 rows=25 width=34) (actual time=153158.180..153158.181 rows=5 loops=1) Sort Key: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount)))) Sort Method: quicksort Memory: 25kB Buffers: shared hit=1099934 read=393536 dirtied=253 written=47 -> HashAggregate (cost=2456726.83..2456727.08 rows=25 width=34) (actual time=153158.013..153158.081 rows=5 loops=1) Buffers: shared hit=1099931 read=393536 dirtied=253 written=47 -> Hash Join (cost=404993.07..2455985.55 rows=74128 width=34) (actual time=28602.432..152834.317 rows=72819 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (customer.c_nationkey = supplier.s_nationkey)) Buffers: shared hit=1099931 read=393536 dirtied=253 written=47 -> Hash Join (cost=400314.07..2413494.77 rows=1853525 width=46) (actual time=28423.757..147430.966 rows=1826304 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=1097749 read=393536 dirtied=253 written=47 -> Seq Scan on lineitem (cost=0.00..1690224.29 rows=60884229 width=16) (actual time=0.026..64301.096 rows=60044793 loops=1) Buffers: shared hit=716989 read=364393 written=29 -> Hash (cost=394520.34..394520.34 rows=463498 width=38) (actual time=28423.045..28423.045 rows=456716 loops=1) Buckets: 65536 Batches: 1 Memory Usage: 32113kB Buffers: shared hit=380760 read=29143 dirtied=253 written=18 -> Hash Join (cost=89366.46..394520.34 rows=463498 width=38) (actual time=6336.939..27584.023 rows=456716 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=380760 read=29143 dirtied=253 written=18 -> Bitmap Heap Scan on orders (cost=50324.25..342152.57 rows=2317488 width=8) (actual time=2499.900..15549.774 rows=2284232 loops=1) Recheck Cond: ((o_orderdate >= '1996-01-01'::date) AND (o_orderdate < '1997-01-01 00:00:00'::timestamp without time zone)) Buffers: shared hit=236781 read=26883 dirtied=253 written=18 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..49744.88 rows=2317488 width=0) (actual time=2352.729..2352.729 rows=2316079 loops=1) Index Cond: ((o_orderdate >= '1996-01-01'::date) AND (o_orderdate < '1997-01-01 00:00:00'::timestamp without time zone)) Buffers: shared read=6615 written=17 -> Hash (cost=35292.22..35292.22 rows=300000 width=38) (actual time=3836.709..3836.709 rows=300270 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 21113kB Buffers: shared hit=143979 read=2260 -> Nested Loop (cost=905.09..35292.22 rows=300000 width=38) (actual time=54.430..3485.220 rows=300270 loops=1) Buffers: shared hit=143979 read=2260 -> Nested Loop (cost=0.00..14.07 rows=5 width=30) (actual time=0.166..0.291 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=0.012..0.079 rows=25 loops=1) Buffers: shared hit=2 -> Materialize (cost=0.00..1.07 rows=1 width=4) (actual time=0.006..0.006 rows=1 loops=25) Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.123..0.124 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=42.391..671.083 rows=60054 loops=5) Recheck Cond: (c_nationkey = nation.n_nationkey) Buffers: shared hit=143976 read=2260 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=33.065..33.065 rows=60054 loops=5) Index Cond: (c_nationkey = nation.n_nationkey) Buffers: shared hit=5 read=831 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=177.247..177.247 rows=100000 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 3907kB Buffers: shared hit=2179 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=8) (actual time=0.017..128.248 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 153192.209 ms (55 rows) COMMIT; COMMIT