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 '1995-01-01' and o_orderdate < date '1995-01-01' + interval '1 year' group by n_name order by revenue desc; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2446941.70..2446941.76 rows=25 width=34) (actual time=87828.950..87828.951 rows=5 loops=1) Sort Key: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount)))) Sort Method: quicksort Memory: 25kB Buffers: shared hit=815185 read=672966 dirtied=253 written=254 -> HashAggregate (cost=2446940.87..2446941.12 rows=25 width=34) (actual time=87828.828..87828.852 rows=5 loops=1) Buffers: shared hit=815182 read=672966 dirtied=253 written=254 -> Hash Join (cost=403386.08..2446203.69 rows=73718 width=34) (actual time=15794.538..87598.914 rows=73274 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (customer.c_nationkey = supplier.s_nationkey)) Buffers: shared hit=815182 read=672966 dirtied=253 written=254 -> Hash Join (cost=398707.08..2403928.39 rows=1842956 width=46) (actual time=15684.110..83087.016 rows=1827087 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=813000 read=672966 dirtied=253 written=254 -> Seq Scan on lineitem (cost=0.00..1683567.83 rows=60644783 width=16) (actual time=0.024..24176.281 rows=60044872 loops=1) Buffers: shared hit=514305 read=562815 -> Hash (cost=392946.42..392946.42 rows=460853 width=38) (actual time=15682.933..15682.933 rows=456477 loops=1) Buckets: 65536 Batches: 1 Memory Usage: 32097kB Buffers: shared hit=298695 read=110151 dirtied=253 written=254 -> Hash Join (cost=89078.92..392946.42 rows=460853 width=38) (actual time=3876.601..15294.578 rows=456477 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=298695 read=110151 dirtied=253 written=254 -> Bitmap Heap Scan on orders (cost=50036.70..340654.68 rows=2304265 width=8) (actual time=1807.728..6413.929 rows=2277578 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate < '1996-01-01 00:00:00'::timestamp without time zone)) Buffers: shared hit=188562 read=74045 dirtied=253 written=229 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..49460.64 rows=2304265 width=0) (actual time=1675.229..1675.229 rows=2300539 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate < '1996-01-01 00:00:00'::timestamp without time zone)) Buffers: shared hit=340 read=6233 -> Hash (cost=35292.22..35292.22 rows=300000 width=38) (actual time=2068.630..2068.630 rows=300270 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 21113kB Buffers: shared hit=110133 read=36106 written=25 -> Nested Loop (cost=905.09..35292.22 rows=300000 width=38) (actual time=23.162..1850.849 rows=300270 loops=1) Buffers: shared hit=110133 read=36106 written=25 -> Nested Loop (cost=0.00..14.07 rows=5 width=30) (actual time=0.053..0.173 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=0.009..0.055 rows=25 loops=1) Buffers: shared hit=2 -> Materialize (cost=0.00..1.07 rows=1 width=4) (actual time=0.001..0.002 rows=1 loops=25) Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.022..0.023 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=31.265..346.588 rows=60054 loops=5) Recheck Cond: (c_nationkey = nation.n_nationkey) Buffers: shared hit=110130 read=36106 written=25 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=21.495..21.495 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=108.622..108.622 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=0.019..69.343 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 87843.393 ms (55 rows) COMMIT; COMMIT