BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'JORDAN' 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 = 'MIDDLE EAST' and s_nationkey = n2.n_nationkey and o_orderdate between date '1995-01-01' and date '1996-12-31' and p_type = 'SMALL BURNISHED STEEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1733930.88..1733932.71 rows=732 width=38) (actual time=16196.217..16196.218 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=1692965 read=318043 written=5858 -> HashAggregate (cost=1733883.24..1733896.05 rows=732 width=38) (actual time=16196.136..16196.138 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1692962 read=318043 written=5858 -> Hash Join (cost=39453.92..1733394.20 rows=24452 width=38) (actual time=2016.060..16137.305 rows=24102 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1692962 read=318043 written=5858 -> Nested Loop (cost=39452.35..1732934.16 rows=24452 width=16) (actual time=2015.973..16077.054 rows=24102 loops=1) Buffers: shared hit=1692958 read=318043 written=5858 -> Hash Join (cost=39452.06..1725044.40 rows=24452 width=16) (actual time=2015.910..15806.310 rows=24102 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1620832 read=317728 written=5855 -> Nested Loop (cost=421.38..1685310.72 rows=122259 width=20) (actual time=10.215..13661.973 rows=121759 loops=1) Buffers: shared hit=1487299 read=305106 written=5855 -> Nested Loop (cost=420.94..1488431.29 rows=402095 width=16) (actual time=9.977..6395.067 rows=400426 loops=1) Buffers: shared hit=262675 read=205289 written=4128 -> Bitmap Heap Scan on part (cost=416.22..28194.99 rows=13393 width=4) (actual time=9.854..107.913 rows=13354 loops=1) Recheck Cond: ((p_type)::text = 'SMALL BURNISHED STEEL'::text) Heap Blocks: exact=11393 Buffers: shared hit=9816 read=1661 written=49 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..412.88 rows=13393 width=0) (actual time=6.621..6.621 rows=13354 loops=1) Index Cond: ((p_type)::text = 'SMALL BURNISHED STEEL'::text) Buffers: shared read=84 -> Bitmap Heap Scan on lineitem (cost=4.72..108.72 rows=31 width=20) (actual time=0.047..0.455 rows=30 loops=13354) Recheck Cond: (l_partkey = part.p_partkey) Heap Blocks: exact=400975 Buffers: shared hit=252859 read=203628 written=4079 -> Bitmap Index Scan on lineitem_l_partkey_l_quantity_l_shipmode_idx (cost=0.00..4.71 rows=31 width=0) (actual time=0.034..0.034 rows=30 loops=13354) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=42528 read=12984 written=294 -> Index Scan using orders_o_orderkey_o_orderdate_idx on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.017..0.017 rows=0 loops=400426) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1224624 read=99817 written=1727 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=2001.257..2001.257 rows=299838 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14638kB Buffers: shared hit=133533 read=12622 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=40.978..1843.090 rows=299838 loops=1) Buffers: shared hit=133533 read=12622 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.068..0.127 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=0.013..0.029 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: 9kB Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.019..0.020 rows=1 loops=1) Filter: (r_name = 'MIDDLE EAST'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.11..6455.64 rows=60000 width=8) (actual time=30.102..353.260 rows=59968 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145317 Buffers: shared hit=133531 read=12622 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=20.498..20.498 rows=59968 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=8 read=828 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.009..0.010 rows=1 loops=24102) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72126 read=315 written=3 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.028..0.028 rows=25 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 10kB Buffers: shared hit=1 -> Seq Scan on nation n2 (cost=0.00..1.25 rows=25 width=30) (actual time=0.004..0.008 rows=25 loops=1) Buffers: shared hit=1 Planning time: 11.393 ms Execution time: 16197.427 ms (70 rows) COMMIT; COMMIT