BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'VIETNAM' 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 BURNISHED BRASS' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2107859.33..2107861.16 rows=732 width=38) (actual time=68728.060..68728.060 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=728501 read=287619 dirtied=2612 written=17330 -> HashAggregate (cost=2107811.69..2107824.50 rows=732 width=38) (actual time=68727.948..68727.949 rows=2 loops=1) Buffers: shared hit=728498 read=287619 dirtied=2612 written=17330 -> Nested Loop (cost=502745.31..2107344.23 rows=23373 width=38) (actual time=39942.707..68587.297 rows=24565 loops=1) Buffers: shared hit=728498 read=287619 dirtied=2612 written=17330 -> Nested Loop (cost=502745.31..2100678.25 rows=23373 width=16) (actual time=39942.629..67064.481 rows=24565 loops=1) Buffers: shared hit=679368 read=287619 dirtied=2612 written=17330 -> Hash Join (cost=502745.31..2093870.83 rows=23377 width=16) (actual time=39942.584..65396.530 rows=24565 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=605566 read=287619 dirtied=2612 written=17330 -> Nested Loop (cost=0.00..1588968.49 rows=384653 width=16) (actual time=0.553..23641.762 rows=405358 loops=1) Buffers: shared hit=241481 read=235977 dirtied=2612 written=17330 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..44353.64 rows=12673 width=4) (actual time=0.410..529.495 rows=13476 loops=1) Index Cond: (p_type = 'ECONOMY BURNISHED BRASS'::text) Heap Fetches: 13476 Buffers: shared hit=7127 read=4499 written=329 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..121.57 rows=31 width=20) (actual time=0.178..1.694 rows=30 loops=13476) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=234354 read=231478 dirtied=2612 written=17001 -> Hash (cost=491213.24..491213.24 rows=922565 width=8) (actual time=39940.909..39940.909 rows=913268 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35675kB Buffers: shared hit=364082 read=51642 -> Hash Join (cost=139190.09..491213.24 rows=922565 width=8) (actual time=11058.715..37850.976 rows=913268 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=364082 read=51642 -> Bitmap Heap Scan on orders (cost=100159.47..425658.87 rows=4612827 width=12) (actual time=4982.412..17183.105 rows=4561761 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=253949 read=15537 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..99006.26 rows=4612827 width=0) (actual time=4846.794..4846.794 rows=4612043 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1 read=13178 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=6076.037..6076.037 rows=300270 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10557kB Buffers: shared hit=110133 read=36105 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=54.101..5870.419 rows=300270 loops=1) Buffers: shared hit=110133 read=36105 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.037..0.091 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=0.007..0.019 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.016..0.016 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=0.013..0.014 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=48.673..1152.843 rows=60054 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=110131 read=36105 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=37.718..37.718 rows=60054 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=5 read=831 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.064..0.064 rows=1 loops=24565) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73802 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.056..0.056 rows=1 loops=24565) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=49130 Total runtime: 68748.741 ms (64 rows) COMMIT; COMMIT