BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'EGYPT' 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 = 'ECONOMY ANODIZED NICKEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1752161.74..1752163.55 rows=727 width=38) (actual time=7603.227..7603.228 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=1810153 read=211275 -> HashAggregate (cost=1752114.46..1752127.18 rows=727 width=38) (actual time=7603.160..7603.162 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1810150 read=211275 -> Hash Join (cost=39450.90..1751623.18 rows=24564 width=38) (actual time=656.684..7569.148 rows=24485 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1810150 read=211275 -> Nested Loop (cost=39449.34..1751161.04 rows=24564 width=16) (actual time=656.610..7540.044 rows=24485 loops=1) Buffers: shared hit=1810146 read=211275 -> Hash Join (cost=39449.05..1743234.81 rows=24565 width=16) (actual time=656.555..7377.601 rows=24485 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1739026 read=208827 -> Nested Loop (cost=418.36..1703497.88 rows=122825 width=20) (actual time=7.833..6664.235 rows=122698 loops=1) Buffers: shared hit=1593702 read=207996 -> Nested Loop (cost=417.93..1504456.76 rows=406510 width=16) (actual time=7.688..3132.890 rows=402547 loops=1) Buffers: shared hit=310834 read=159044 -> Bitmap Heap Scan on part (cost=417.36..28370.52 rows=13540 width=4) (actual time=7.623..152.644 rows=13423 loops=1) Recheck Cond: ((p_type)::text = 'ECONOMY ANODIZED NICKEL'::text) Heap Blocks: exact=11518 Buffers: shared hit=7 read=11594 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..413.98 rows=13540 width=0) (actual time=5.220..5.220 rows=13423 loops=1) Index Cond: ((p_type)::text = 'ECONOMY ANODIZED NICKEL'::text) Buffers: shared read=83 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.56..108.71 rows=31 width=20) (actual time=0.022..0.213 rows=30 loops=13423) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=310827 read=147450 -> Index Scan using orders_o_orderkey_o_orderdate_idx on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.008..0.008 rows=0 loops=402547) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1282868 read=48952 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=645.562..645.562 rows=299838 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14638kB Buffers: shared hit=145324 read=831 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=21.148..562.769 rows=299838 loops=1) Buffers: shared hit=145324 read=831 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.033..0.092 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=0.003..0.019 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.015..0.015 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=0.010..0.011 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=18.520..102.247 rows=59968 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145317 Buffers: shared hit=145322 read=831 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=12.379..12.379 rows=59968 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=5 read=831 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.005..0.006 rows=1 loops=24485) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=71120 read=2448 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.021..0.021 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=0.003..0.004 rows=25 loops=1) Buffers: shared hit=1 Planning time: 11.981 ms Execution time: 7604.031 ms (66 rows) COMMIT; COMMIT