BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'INDONESIA' 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 = 'ASIA' and s_nationkey = n2.n_nationkey and o_orderdate between date '1995-01-01' and date '1996-12-31' and p_type = 'ECONOMY BRUSHED STEEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2204154.82..2204156.64 rows=731 width=38) (actual time=29363.302..29363.302 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=792347 read=213450 dirtied=382 -> HashAggregate (cost=2204107.25..2204120.04 rows=731 width=38) (actual time=29363.231..29363.233 rows=2 loops=1) Buffers: shared hit=792344 read=213450 dirtied=382 -> Nested Loop (cost=496502.98..2203608.53 rows=24936 width=38) (actual time=21772.871..29298.128 rows=24469 loops=1) Buffers: shared hit=792344 read=213450 dirtied=382 -> Nested Loop (cost=496502.98..2196496.78 rows=24936 width=16) (actual time=21772.793..29129.062 rows=24469 loops=1) Buffers: shared hit=743406 read=213450 dirtied=382 -> Hash Join (cost=496502.98..2189235.34 rows=24936 width=16) (actual time=21772.741..28793.500 rows=24469 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=669878 read=213450 dirtied=382 -> Nested Loop (cost=0.00..1690430.39 rows=410524 width=16) (actual time=0.395..5714.252 rows=401952 loops=1) Buffers: shared hit=272209 read=198140 dirtied=382 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..47234.56 rows=13633 width=4) (actual time=0.322..88.891 rows=13411 loops=1) Index Cond: (p_type = 'ECONOMY BRUSHED STEEL'::text) Heap Fetches: 13411 Buffers: shared hit=11430 read=85 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.22 rows=31 width=20) (actual time=0.041..0.404 rows=30 loops=13411) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=260779 read=198055 dirtied=382 -> Hash (cost=485068.54..485068.54 rows=914755 width=8) (actual time=21771.374..21771.374 rows=913295 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35676kB Buffers: shared hit=397666 read=15310 -> Hash Join (cost=135881.71..485068.54 rows=914755 width=8) (actual time=4787.490..21168.779 rows=913295 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=397666 read=15310 -> Bitmap Heap Scan on orders (cost=96851.09..419738.71 rows=4573775 width=12) (actual time=3242.394..7668.662 rows=4561773 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=252649 read=14089 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..95707.65 rows=4573775 width=0) (actual time=3103.547..3103.547 rows=4575464 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared read=12457 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=1544.563..1544.563 rows=300270 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10557kB Buffers: shared hit=145017 read=1221 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=37.405..1339.950 rows=300270 loops=1) Buffers: shared hit=145017 read=1221 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.026..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=0.004..0.023 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.011..0.011 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 = '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=32.849..248.016 rows=60054 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=145015 read=1221 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=22.806..22.806 rows=60054 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=6 read=830 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.011..0.012 rows=1 loops=24469) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73528 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.004..0.004 rows=1 loops=24469) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48938 Total runtime: 29383.423 ms (64 rows) COMMIT; COMMIT