BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'GERMANY' then volume else 0 end) / sum(volume) as mkt_share from ( select extract(year from o_orderdate) as o_year, l_extendedprice * (1 - l_discount) as volume, n2.n_name as nation from part, supplier, lineitem, orders, customer, nation n1, nation n2, region where p_partkey = l_partkey and s_suppkey = l_suppkey and l_orderkey = o_orderkey and o_custkey = c_custkey and c_nationkey = n1.n_nationkey and n1.n_regionkey = r_regionkey and r_name = 'EUROPE' and s_nationkey = n2.n_nationkey and o_orderdate between date '1995-01-01' and date '1996-12-31' and p_type = 'ECONOMY BRUSHED COPPER' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2190150.46..2190152.29 rows=732 width=38) (actual time=11519.283..11519.284 rows=2 loops=1) Sort Key: (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone)) Sort Method: quicksort Memory: 25kB Buffers: shared hit=819659 read=195285 -> HashAggregate (cost=2190102.82..2190115.63 rows=732 width=38) (actual time=11519.226..11519.228 rows=2 loops=1) Buffers: shared hit=819656 read=195285 -> Nested Loop (cost=495401.13..2189609.52 rows=24665 width=38) (actual time=7887.952..11486.742 rows=24688 loops=1) Buffers: shared hit=819656 read=195285 -> Nested Loop (cost=495401.13..2182575.06 rows=24665 width=16) (actual time=7887.887..11426.418 rows=24688 loops=1) Buffers: shared hit=770280 read=195285 -> Hash Join (cost=495401.13..2175391.36 rows=24669 width=16) (actual time=7887.831..11279.235 rows=24688 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=698517 read=192836 -> Nested Loop (cost=0.00..1677714.02 rows=405904 width=16) (actual time=0.728..2992.601 rows=410506 loops=1) Buffers: shared hit=318900 read=160295 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..46900.42 rows=13520 width=4) (actual time=0.611..125.997 rows=13700 loops=1) Index Cond: (p_type = 'ECONOMY BRUSHED COPPER'::text) Heap Fetches: 13700 Buffers: shared hit=5 read=11768 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.31 rows=31 width=20) (actual time=0.021..0.201 rows=30 loops=13700) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=318895 read=148527 -> Hash (cost=483994.37..483994.37 rows=912541 width=8) (actual time=7886.178..7886.178 rows=913948 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35702kB Buffers: shared hit=379614 read=32541 -> Hash Join (cost=135796.24..483994.37 rows=912541 width=8) (actual time=1691.869..7617.477 rows=913948 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=379614 read=32541 -> Bitmap Heap Scan on orders (cost=96765.62..418728.20 rows=4562705 width=12) (actual time=1044.764..3561.087 rows=4561961 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=234270 read=31708 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..95624.95 rows=4562705 width=0) (actual time=975.536..975.536 rows=4561961 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared read=12456 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=646.896..646.896 rows=300963 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10581kB Buffers: shared hit=145344 read=833 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=31.558..580.585 rows=300963 loops=1) Buffers: shared hit=145344 read=833 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.029..0.077 rows=5 loops=1) Hash Cond: (n1.n_regionkey = region.r_regionkey) Buffers: shared hit=2 -> Seq Scan on nation n1 (cost=0.00..1.25 rows=25 width=8) (actual time=0.006..0.021 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.013..0.013 rows=1 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 1kB Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.009..0.010 rows=1 loops=1) Filter: (r_name = 'EUROPE'::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=19.627..105.700 rows=60193 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=145342 read=833 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=13.667..13.667 rows=60193 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=6 read=833 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.005..0.005 rows=1 loops=24688) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=71763 read=2449 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.001..0.001 rows=1 loops=24688) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=49376 Total runtime: 11522.318 ms (64 rows) COMMIT; COMMIT