BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'RUSSIA' 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 = 'LARGE ANODIZED STEEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2212382.47..2212384.30 rows=732 width=38) (actual time=60194.035..60194.036 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=685787 read=322629 dirtied=3485 written=24 -> HashAggregate (cost=2212334.83..2212347.64 rows=732 width=38) (actual time=60192.810..60192.814 rows=2 loops=1) Buffers: shared hit=685784 read=322629 dirtied=3485 written=24 -> Nested Loop (cost=504573.10..2211830.93 rows=25195 width=38) (actual time=42979.576..60090.458 rows=24120 loops=1) Buffers: shared hit=685784 read=322629 dirtied=3485 written=24 -> Nested Loop (cost=504573.10..2204645.32 rows=25195 width=16) (actual time=42979.485..59357.347 rows=24120 loops=1) Buffers: shared hit=637544 read=322629 dirtied=3485 written=24 -> Hash Join (cost=504573.10..2197307.34 rows=25199 width=16) (actual time=42979.422..58456.536 rows=24120 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=565053 read=322629 dirtied=3485 written=24 -> Nested Loop (cost=0.00..1690409.08 rows=414633 width=16) (actual time=1.914..14199.322 rows=399103 loops=1) Buffers: shared hit=260046 read=210913 dirtied=3485 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..47157.94 rows=13607 width=4) (actual time=0.476..419.068 rows=13292 loops=1) Index Cond: (p_type = 'LARGE ANODIZED STEEL'::text) Heap Fetches: 13292 Buffers: shared hit=4499 read=6962 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.46 rows=31 width=20) (actual time=0.104..1.018 rows=30 loops=13292) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=255547 read=203951 dirtied=3485 -> Hash (cost=492995.45..492995.45 rows=926212 width=8) (actual time=42975.474..42975.474 rows=913924 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35701kB Buffers: shared hit=305004 read=111716 written=24 -> Hash Join (cost=139580.97..492995.45 rows=926212 width=8) (actual time=13251.452..42284.887 rows=913924 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=305004 read=111716 written=24 -> Bitmap Heap Scan on orders (cost=100550.35..427336.24 rows=4631059 width=12) (actual time=5650.787..19473.198 rows=4561743 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=194942 read=75601 written=24 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..99392.59 rows=4631059 width=0) (actual time=5513.210..5513.210 rows=4630287 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared read=13223 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=7600.447..7600.447 rows=300963 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10581kB Buffers: shared hit=110062 read=36115 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=46.008..7377.490 rows=300963 loops=1) Buffers: shared hit=110062 read=36115 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.050..0.111 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=0.010..0.025 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.024..0.024 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=0.021..0.022 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=50.239..1453.419 rows=60193 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=110060 read=36115 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=40.107..40.107 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=0.034..0.034 rows=1 loops=24120) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72491 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.025..0.026 rows=1 loops=24120) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48240 Total runtime: 60213.892 ms (64 rows) COMMIT; COMMIT