BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'SAUDI ARABIA' 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 = 'MEDIUM BRUSHED NICKEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2183443.76..2183445.59 rows=731 width=38) (actual time=27223.722..27223.722 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=868469 read=137432 dirtied=631 written=7602 -> HashAggregate (cost=2183396.20..2183408.99 rows=731 width=38) (actual time=27223.655..27223.656 rows=2 loops=1) Buffers: shared hit=868466 read=137432 dirtied=631 written=7602 -> Nested Loop (cost=495182.41..2182905.54 rows=24533 width=38) (actual time=20515.059..27162.054 rows=24472 loops=1) Buffers: shared hit=868466 read=137432 dirtied=631 written=7602 -> Nested Loop (cost=495182.41..2175908.73 rows=24533 width=16) (actual time=20514.971..26990.980 rows=24472 loops=1) Buffers: shared hit=819522 read=137432 dirtied=631 written=7602 -> Hash Join (cost=495182.41..2168764.63 rows=24533 width=16) (actual time=20514.904..26650.753 rows=24472 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=745986 read=137432 dirtied=631 written=7602 -> Nested Loop (cost=0.00..1671316.34 rows=404110 width=16) (actual time=0.254..4859.820 rows=403176 loops=1) Buffers: shared hit=361893 read=109388 dirtied=631 written=6914 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..46719.90 rows=13460 width=4) (actual time=0.199..152.029 rows=13420 loops=1) Index Cond: (p_type = 'MEDIUM BRUSHED NICKEL'::text) Heap Fetches: 13420 Buffers: shared hit=7347 read=4152 written=408 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.39 rows=31 width=20) (actual time=0.040..0.336 rows=30 loops=13420) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=354546 read=105236 dirtied=631 written=6506 -> Hash (cost=483788.09..483788.09 rows=911546 width=8) (actual time=20513.878..20513.878 rows=910630 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35572kB Buffers: shared hit=384090 read=28044 written=688 -> Hash Join (cost=135693.23..483788.09 rows=911546 width=8) (actual time=4445.218..19981.447 rows=910630 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=384090 read=28044 written=688 -> Bitmap Heap Scan on orders (cost=96662.61..418550.53 rows=4557728 width=12) (actual time=2537.515..6701.585 rows=4557440 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=249395 read=16583 written=688 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..95523.18 rows=4557728 width=0) (actual time=2433.181..2433.181 rows=4561961 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=11760 read=696 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=1907.431..1907.431 rows=299838 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10542kB Buffers: shared hit=134695 read=11461 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=39.633..1729.030 rows=299838 loops=1) Buffers: shared hit=134695 read=11461 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.026..0.096 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..0.018 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.012..0.012 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=0.010..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=905.09..6455.63 rows=60000 width=8) (actual time=43.879..326.245 rows=59968 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=134693 read=11461 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=29.056..29.056 rows=59968 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=10 read=827 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.012..0.012 rows=1 loops=24472) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73536 -> 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=24472) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48944 Total runtime: 27242.248 ms (64 rows) COMMIT; COMMIT